JP2017003194A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater capable of preventing wasteful boiling without increasing a burden on a user.SOLUTION: A water heater includes: a heat pump unit 1; a day time boiling control part 32f; a night time boiling control part 32e; a boiling prohibition control part 32g; and a time setting part 32h. The heat pump unit 1 boils water and supplies it to a hot water storage tank 3. The day time boiling control part 32f allows the heat pump unit 1 to boil water during a day time zone. The night time boiling control part 32e allows the heat pump unit 1 to boil water during a night time zone in which electricity charge is relatively cheaper than in the day time zone. The boiling prohibition control part 32g prohibits boiling of water by the heat pump unit 1 from the setting start time of the day time zone until the predetermined time of the night time zone. The time setting part 32h is provided for setting the setting start time.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water heater.

  Patent Document 1 describes a hot water storage type water heater. The hot water storage type water heater described in Patent Document 1 includes heating means, a control device, and a remote controller. The control device has an automatic boiling function. The control device causes the heating means to boil water by the automatic boiling function. The remote control has an eco stop setting button. The user can pause the automatic boiling function by operating the eco-stop setting button until the midnight time of the day. Thereby, useless boiling in the daytime time zone is prevented.

JP 2007-285658 A

  In the hot water storage type water heater described in Patent Document 1, the user needs to operate the eco-stop setting button at the time when it is desired to temporarily stop the automatic boiling function. In addition, for example, when the automatic boiling function is paused every day, the user needs to operate the eco-stop setting button at the time when he / she wants to pause every day. The hot water storage type water heater described in Patent Document 1 has a problem that the burden on the user for stopping the automatic boiling function is large.

  The present invention has been made to solve the above problems. An object of the present invention is to provide a water heater that can prevent unnecessary boiling without increasing the burden on the user.

  The water heater according to the present invention includes a boiling means for boiling water to supply the hot water storage tank, a first boiling control means for boiling water in the boiling means in a first time zone, and a first time zone. In the second time zone where the electricity rate is cheap, the second boiling control means for boiling water in the boiling means, and the water boiling by the boiling means for the second time from the setting start time of the first time zone. Boil-up prohibiting means for prohibiting until the specified time of the belt and time setting means for setting the setting start time are provided.

  The water heater according to the present invention sets boiling start prohibiting means for prohibiting boiling of water by the boiling means from a setting start time in the first time zone to a specified time in the second time zone, and a setting start time. Time setting means. For this reason, the water heater according to the present invention can prevent unnecessary boiling without increasing the burden on the user.

It is a block diagram of the water heater of Embodiment 1 of this invention. It is a flowchart which shows the control procedure of the control apparatus of Embodiment 1 of this invention. It is a flowchart which shows the control procedure of the control apparatus of Embodiment 2 of this invention. It is a flowchart which shows the control procedure of the control apparatus of Embodiment 3 of this invention. It is a flowchart which shows the control procedure of the control apparatus of Embodiment 4 of this invention. It is a flowchart which shows the control procedure of the control apparatus of Embodiment 5 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, the same part or an equivalent part attaches | subjects the same code | symbol, and abbreviate | omits the overlapping description.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a water heater according to Embodiment 1 of the present invention. The water heater includes a heat pump unit 1 and a hot water storage unit 2. The heat pump unit 1 and the hot water storage unit 2 are connected by piping.

  The heat pump unit 1 includes a compressor, a hot water supply heat exchanger, an expansion valve, and an air heat exchanger. The compressor, the hot water supply heat exchanger, the expansion valve, and the air heat exchanger are sequentially connected by a refrigerant pipe. The compressor, the hot water supply heat exchanger, the expansion valve, the air heat exchanger, and the refrigerant pipe constitute a refrigeration cycle system. The heat pump unit 1 boils water by a refrigeration cycle system. The heat pump unit 1 is an example of the boiling means of the present invention. The heat pump unit 1 supplies the heated water to the hot water storage unit 2.

  The hot water storage unit 2 includes a hot water storage tank 3 and a heat exchanger 4. The hot water storage unit 2 includes a heat pump circulation pump 5, a tank circulation pump 6, and a bath circulation pump 7. The hot water storage unit 2 includes a general hot water supply side mixing valve 8, a bath hot water supply side mixing valve 9, and an electromagnetic valve 10.

  The hot water storage tank 3 stores water therein. The hot water storage tank 3 stores water so as to cause a temperature difference between the upper and lower sides. Hot water is stored in the upper part of the hot water storage tank 3. In addition, low temperature water is stored in the lower part of the hot water storage tank 3.

  The hot water storage tank 3 has a heat pump outlet 3a, a water supply port 3b, and a reheating return port 3c at the lower part. The hot water storage tank 3 has a heat pump return port 3d, a hot water supply port 3e, and a retreat port 3f at the top.

  On the outer surface of the hot water storage tank 3, a first temperature sensor 11a, a second temperature sensor 11b, a third temperature sensor 11c, and a fourth temperature sensor 11d are provided at different mounting heights. The 1st temperature sensor 11a, the 2nd temperature sensor 11b, the 3rd temperature sensor 11c, and the 4th temperature sensor 11d are provided in order from the upper part to the lower part, for example. The 1st temperature sensor 11a, the 2nd temperature sensor 11b, the 3rd temperature sensor 11c, and the 4th temperature sensor 11d detect the temperature of the water of the position provided, respectively.

  The first temperature sensor 11a is provided at a position of 0 L from the full capacity of the hot water storage tank 3, for example. The 2nd temperature sensor 11b is provided in the position of 50 L from the full capacity of the hot water storage tank 3, for example. The third temperature sensor 11c is provided at a position 100 L from the full capacity of the hot water storage tank 3, for example. The fourth temperature sensor 11d is provided at a position 150 L from the full capacity of the hot water storage tank 3, for example. The number of temperature sensors provided on the outer surface of the hot water storage tank 3 may be other than the four in this example.

  One end of the heat pump outlet pipe 12 is connected to the heat pump outlet 3a. The other end of the heat pump outgoing pipe 12 is connected to the inlet of the heat pump unit 1. One end of the heat pump return pipe 13 is connected to the outlet of the heat pump unit 1. The other end of the heat pump return pipe 13 is connected to the heat pump return port 3d. The heat pump outgoing pipe 12 and the heat pump return pipe 13 connect the heat pump unit 1 and the hot water storage unit 2.

  A heat pump circulation pump 5 is provided in the heat pump outgoing pipe 12. The heat pump circulation pump 5 takes out low-temperature water from the lower part of the hot water storage tank 3. The water taken out from the lower part of the hot water storage tank 3 is supplied to the heat pump unit 1 via the heat pump outgoing pipe 12. The heat pump unit 1 boils the supplied water.

  The water boiled up by the heat pump unit 1 is supplied to the upper part of the hot water storage tank 3 through the heat pump return pipe 13. The hot water storage tank 3 stores water boiled by the heat pump unit 1. The heat pump outgoing pipe 12 and the heat pump return pipe 13 constitute a heating circulation circuit 14.

  The heat pump outgoing pipe 12 is provided with a fifth temperature sensor 11e. The fifth temperature sensor 11 e detects the temperature of water in the heat pump outgoing pipe 12. The first temperature sensor 11 a, the second temperature sensor 11 b, the third temperature sensor 11 c, the fourth temperature sensor 11 d, and the fifth temperature sensor 11 e are devices for detecting the heat amount of the water stored in the hot water storage tank 3. .

  A hot water storage tank temperature sensor 15 is provided at a connection portion between the heat pump return pipe 13 and the heat pump return port 3d. The hot water storage tank temperature sensor 15 detects the temperature of the water supplied from the heat pump unit 1 to the hot water storage tank 3. The hot water tank temperature sensor 15 may be provided in the vicinity of the heat pump return port 3 d on the outer surface of the hot water tank 3.

  The hot water storage unit 2 is connected to a water source outside the hot water storage unit 2 by a water supply pipe 16. The water source is water. One end of the water supply pipe 16 is connected to the water source. The other end of the water supply pipe 16 branches into two at a first branch point 16 a inside the hot water storage unit 2.

  The water supply pipe 16 is provided with a water supply temperature sensor 17 between the water source and the first branch point 16a. The feed water temperature sensor 17 detects the temperature of the water flowing through the feed water pipe 16.

  One of the water supply pipes 16 branched into two at the first branch point 16a is connected to the water supply port 3b. The other of the water supply pipes 16 branched into two at the first branch point 16a branches again into two at the second branch point 16b. One of the water supply pipes 16 branched into two at the second branch point 16 b is connected to the general hot water supply side mixing valve 8. The other of the water supply pipes 16 branched into two at the second branch point 16 b is connected to the bath hot water supply side mixing valve 9.

  One end of a hot water supply pipe 18 is connected to the hot water supply port 3e. The other end of the hot water supply pipe 18 branches into two at the third branch point 18a. One of the hot water supply pipes 18 branched into two at the third branch point 18 a is connected to the general hot water supply side mixing valve 8. The other of the hot water supply pipes 18 branched into two at the third branch point 18 a is connected to the bath hot water supply side mixing valve 9.

  One end of a mixed hot water supply pipe 19 is connected to the general hot water supply side mixing valve 8. The other end of the mixed hot water supply pipe 19 is connected to a hot water terminal outside the hot water storage unit 2. The hot spring terminal is a faucet and a shower. Low temperature water is supplied from the water supply pipe 16 to the general hot water supply side mixing valve 8. Hot water is supplied from the hot water supply pipe 18 to the general hot water supply side mixing valve 8. The general hot water supply side mixing valve 8 mixes the supplied low-temperature water and high-temperature water. The general hot water supply side mixing valve 8 generates water at an appropriate temperature. The general hot water supply side mixing valve 8 supplies water at an appropriate temperature to the hot water outlet terminal via the mixed hot water supply pipe 19.

  The mixed hot water supply pipe 19 is provided with a hot water supply flow rate sensor 20 and a hot water supply temperature sensor 21 in this order between the general hot water supply side mixing valve 8 and the hot water outlet terminal. The hot water supply flow rate sensor 20 detects the flow rate of water flowing through the mixed hot water supply pipe 19. The hot water supply temperature sensor 21 detects the temperature of the water flowing through the mixed hot water supply pipe 19. The hot water flow sensor 20 and the hot water temperature sensor 21 may be provided in the reverse order of the above example.

  One end of a mixed bath pipe 22 is connected to the bath hot water side mixing valve 9. One end of a bath outlet pipe 23 is connected to the other end of the mixed bath pipe 22. The other end of the bath outlet pipe 23 is connected to a bathtub outside the hot water storage unit 2 via a bathtub adapter or the like.

  Low temperature water is supplied from the water supply pipe 16 to the bath hot water supply side mixing valve 9. Hot water is supplied to the hot water supply side mixing valve 9 from the hot water supply pipe 18. The bath hot water side mixing valve 9 mixes the supplied low-temperature water and high-temperature water. The bath hot water side mixing valve 9 generates water at an appropriate temperature. The bath hot water supply side mixing valve 9 supplies water at an appropriate temperature to the bathtub via the mixed bath pipe 22 and the bath outlet pipe 23.

  The mixed bath tube 22 is provided with a solenoid valve 10. The mixed bath pipe 22 is provided with a bath flow sensor 24 between the solenoid valve 10 and the bath outlet pipe 23. The bath flow rate sensor 24 detects the flow rate of water flowing through the mixed bath tube 22. A bath temperature sensor 25 is provided at the connection between the mixed bath pipe 22 and the bath outlet pipe 23. The bath temperature sensor 25 detects the temperature of the water flowing through the mixed bath pipe 22 or the bath outlet pipe 23.

  In addition, one end of a bath circulation pipe 26 is connected to a connection part with the mixed bath pipe 22 in the bath outlet pipe 23. The other end of the bath circulation pipe 26 is connected to the secondary side outlet of the heat exchanger 4. One end of a bath return pipe 27 is connected to the secondary side inlet of the heat exchanger 4. The other end of the bath return pipe 27 is connected to a bathtub outside the hot water storage unit 2 via a bathtub adapter or the like. The bath outlet pipe 23, the bath circulation pipe 26, and the bath return pipe 27 constitute a bath circulation circuit 28.

  The bath return pipe 27 is provided with a bath circulation pump 7. The bath circulation pump 7 circulates the water in the bathtub in the bath circulation circuit 28. The bath circulation pump 7 may be provided in the bath outlet pipe 23 or the bath circulation pipe 26.

  One end of a tank going-out pipe 29 is connected to the retreating port 3f. The other end of the tank outgoing pipe 29 is connected to the primary inlet of the heat exchanger 4. One end of the tank return pipe 30 is connected to the primary side outlet of the heat exchanger 4. The other end of the tank return pipe 30 is connected to the reheating return port 3c. The tank outlet pipe 29 and the tank return pipe 30 constitute a tank circulation circuit 31.

  A tank circulation pump 6 is provided in the tank return pipe 30. The tank circulation pump 6 circulates the water in the hot water storage tank 3 in the tank circulation circuit 31. The tank circulation pump 6 may be provided in the tank outgoing pipe 29.

  Further, the water heater according to the present embodiment includes a control device 32. The control device 32 is provided inside the hot water storage unit 2. The control device 32 is electrically connected to a remote controller 33 outside the hot water storage unit 2. The control device 32 and the remote controller 33 can communicate with each other. The control device 32 may be provided outside the hot water storage unit 2 or the like.

  The remote controller 33 includes, for example, an operation unit 33a, a changeover switch 33b, a display unit 33c, and the like. The operation unit 33a and the changeover switch 33b are provided for the user to operate the water heater. The display unit 33c displays the state of the water heater.

  The control device 32 is electrically connected to the heat pump unit 1. The control device 32 and the heat pump unit 1 can communicate with each other. The control device 32 controls the heat pump unit 1.

  The control device 32 is electrically connected to the heat pump circulation pump 5, the tank circulation pump 6, the bath circulation pump 7, the general hot water supply side mixing valve 8, the bath hot water supply side mixing valve 9, and the electromagnetic valve 10. The control device 32 controls the heat pump circulation pump 5, the tank circulation pump 6, the bath circulation pump 7, the general hot water supply side mixing valve 8, the bath hot water supply side mixing valve 9 and the electromagnetic valve 10.

  The control device 32 is electrically connected to the first temperature sensor 11a, the second temperature sensor 11b, the third temperature sensor 11c, the fourth temperature sensor 11d, and the fifth temperature sensor 11e. The control device 32 acquires water temperature information from the first temperature sensor 11a, the second temperature sensor 11b, the third temperature sensor 11c, the fourth temperature sensor 11d, and the fifth temperature sensor 11e.

  The control device 32 is electrically connected to the hot water storage tank temperature sensor 15, the water supply temperature sensor 17, the hot water supply temperature sensor 21, and the bath temperature sensor 25. The control device 32 acquires water temperature information from the hot water storage tank temperature sensor 15, the water supply temperature sensor 17, the hot water supply temperature sensor 21, and the bath temperature sensor 25.

  The control device 32 is electrically connected to the hot water flow sensor 20 and the bath flow sensor 24. The control device 32 acquires water flow rate information from the hot water flow rate sensor 20 and the bath flow rate sensor 24.

  The control device 32 includes a hot water replenishment control unit 32a, a heat storage amount calculation unit 32b, a use heat amount calculation unit 32c, a target heat amount calculation unit 32d, a nighttime heating control unit 32e, a daytime heating control unit 32f, and a heating prohibition control. 32g and time setting unit 32h.

  The hot water refilling control unit 32 a controls the bath hot water supply side mixing valve 9 and the electromagnetic valve 10. For example, a hot water filling function is set in the control device 32 when the user operates the operation unit 33a. The hot water supply apparatus of the present embodiment starts the hot water filling operation when the hot water filling function is set in the control device 32. The hot water refilling controller 32a operates the hot water supply side mixing valve 9 during the hot water filling operation. Further, the hot water refilling control unit 32a opens the solenoid valve 10 during the hot water filling operation.

  The hot water refilling control unit 32a causes the bath hot water supply side mixing valve 9 to generate water at an appropriate temperature. The appropriate temperature is set in the hot water refill control unit 32a by the user operating the remote controller 33. The bath hot water supply side mixing valve 9 mixes low temperature water and high temperature water so that the temperature detected by the bath temperature sensor 25 is an appropriate temperature. The bath hot water supply side mixing valve 9 supplies water of an appropriate temperature to the bathtub.

  The hot water replenishment control unit 32a causes the hot water supply side mixing valve 9 to supply water at an appropriate temperature until the hot water filling amount to the bathtub reaches the set hot water filling amount. The set hot water filling amount is set in the hot water pouring control unit 32 a by the user operating the remote controller 33. The hot water replenishment controller 32 a calculates the amount of hot water to the bathtub based on the information acquired from the bath flow sensor 24. The control device 32 closes the solenoid valve 10 when the amount of hot water to the bathtub reaches the set amount of hot water. When the solenoid valve 10 is closed, the hot water filling operation is completed.

  The hot water filling function set in the control device 32 is canceled when the hot water filling operation is completed. The hot water filling function in the present embodiment is an example of an operation function that is automatically released after a predetermined time has elapsed. The operation unit 33a is an example of a function setting unit.

  Further, the hot water refilling control unit 32 a controls the tank circulation pump 6 and the bath circulation pump 7. The water heater according to the present embodiment starts a chasing operation when the user operates the remote controller 33. The control device 32 drives the tank circulation pump 6 and the bath circulation pump 7 during the chasing operation.

  When the tank circulation pump 6 is driven, the hot water in the hot water storage tank 3 is taken out from the retreat port 3f. The high-temperature water taken out from the retreating port 3 f flows into the primary side of the heat exchanger 4 through the tank outbound piping 29. When the bath circulation pump 7 is driven, water is taken out from the bathtub. The water taken out from the bathtub flows into the secondary side of the heat exchanger 4 through the bath return pipe 27.

  The heat exchanger 4 performs heat exchange between high-temperature water flowing on the primary side of the heat exchanger 4 and water flowing on the secondary side of the heat exchanger 4. The temperature of the water flowing through the primary side of the heat exchanger 4 decreases. The water flowing on the secondary side of the heat exchanger 4 is heated. The water whose temperature has flowed down on the primary side of the heat exchanger 4 is returned to the hot water storage tank 3 through the tank return pipe 30 and the recirculation return port 3c. The heated water flowing on the secondary side of the heat exchanger 4 is returned to the bathtub via the bath circulation pipe 26 and the bath outlet pipe 23. Thereby, the water of a bathtub is heated.

  When the temperature detected by the bath temperature sensor 25 reaches an appropriate temperature, the hot water replenishment control unit 32a stops the tank circulation pump 6 and the bath circulation pump 7. The appropriate temperature is set in the hot water refill control unit 32a by the user operating the remote controller 33. When the tank circulation pump 6 and the bath circulation pump 7 are stopped, the chasing operation is finished.

  In the present embodiment, the hot water supply side mixing valve 9 and the electromagnetic valve 10 are an example of a hot water filling means that fills a bathtub with water stored in the hot water storage tank 3. The tank circulation pump 6 and the bath circulation pump 7 are an example of a reheating means for heating water in the bathtub. The hot water refilling control unit 32a is an example of a hot water refilling control unit that controls the hot water refilling means and the hot water replenishing means.

  The heat storage amount calculation unit 32 b calculates the heat amount of the water stored in the hot water storage tank 3. The heat storage amount calculation unit 32b is an example of a heat storage amount calculation unit. The heat storage amount calculation unit 32b is stored in the hot water storage tank 3 based on information acquired from the first temperature sensor 11a, the second temperature sensor 11b, the third temperature sensor 11c, the fourth temperature sensor 11d, and the fifth temperature sensor 11e. Calculate the heat quantity of water. Hereinafter, the heat amount calculated by the heat storage amount calculation unit 32b is simply referred to as a heat storage amount.

  The used heat amount calculation unit 32c calculates the used heat amount. The amount of heat used is the amount of heat of water used from the hot water storage tank 3 during a certain period. The certain period is, for example, one week. The predetermined amount of heat is stored in advance in the used heat amount calculation unit 32c. Note that the predetermined period may be set by the remote controller 33 as an arbitrary period in the used heat amount calculation unit 32c.

  The use heat amount calculation unit 32 c calculates the use heat amount based on information acquired from the water supply temperature sensor 17, the hot water supply flow sensor 20, the hot water supply temperature sensor 21, the bath flow sensor 24, and the bath temperature sensor 25.

  The target heat amount calculation unit 32d calculates a target heat amount based on the use heat amount calculated by the use heat amount calculation unit 32c. The target heat amount is, for example, a heat amount that is predicted to be used during the day. The target heat amount calculation unit 32d calculates, for example, an average value of heat used per day for a certain period as the target heat amount. Note that the target heat amount calculation unit 32d may calculate the maximum value of heat used per day for a certain period as the target heat amount.

  The night boiling control unit 32e controls the heat pump unit 1. The night boiling control unit 32e causes the heat pump unit 1 to boil water at night time. The night boiling control unit 32e is an example of the second boiling control means of the present invention.

  The night time zone is a time zone that is set as a cheaper time zone for the unit price of electricity, for example, within 24 hours. The night time zone is set as, for example, from 23:00 to 7:00. The night time zone is an example of a second time zone. The night time zone is set in advance in the night boiling control unit 32e. The night time zone may be set in the night heating control unit 32e as an arbitrary time zone by the remote controller 33.

  The night boiling control unit 32e causes the heat pump unit 1 to boil water during the night time period according to the target heat amount calculated by the target heat amount calculation unit 32d. The night boiling control unit 32e causes the heat pump unit 1 to boil water at the night boiling start time in the night time zone. The night boiling start time is preset in the night boiling control unit 32e. The night boiling control unit 32e controls the heat pump unit 1 so that the heat storage amount is equal to or higher than the target heat amount before the night time period ends. Thereby, the target heat quantity is ensured in the hot water storage tank 3 during the night time.

  The night boiling start time may be set as an arbitrary time in the night time zone by the remote controller 33. The night boiling start time may be calculated by the night boiling control unit 32e based on the target heat amount, the heating capacity of the heat pump unit 1, and the like. The night boiling control unit 32e may vary the night boiling start time depending on the day.

  The daytime boiling control unit 32 f controls the heat pump unit 1. The daytime boiling control unit 32f causes the heat pump unit 1 to boil water during the daytime. The daytime boiling control unit 32f is an example of a first boiling control unit of the present invention.

  The daytime time zone is set as a time zone that is not a night time zone. The daytime time zone is, for example, a time zone set as a time zone in which the electricity bill unit price is higher than the night time zone in 24 hours. The daytime time zone is set as, for example, from 7:00 to 23:00. The daytime time zone is an example of a first time zone. The daytime time zone is set in advance in the daytime heating control unit 32f. The daytime time zone may be set in the daytime heating control unit 32f as an arbitrary time zone by the remote controller 33.

  The daytime boiling control unit 32f causes the heat pump unit 1 to boil water when the heat storage amount falls below the startup heat amount during the daytime period. The startup heat amount is a threshold value that causes the heat pump unit 1 to start boiling water. The amount of starting heat is preset in the daytime boiling control unit 32f. The starting heat amount is set as, for example, the heat amount of 300 L of water in terms of 42 ° C.

  The daytime boiling control unit 32 f causes the heat pump unit 1 to finish boiling water when the heat storage amount exceeds the end heat amount after the heat pump unit 1 starts boiling water. The end heat amount is a threshold value for ending the boiling of water by the heat pump unit 1. The end heat quantity is preset in the daytime boiling control unit 32f. The end heat amount is set as, for example, the heat amount of 350 L of water in terms of 42 ° C.

  The boiling prohibition control unit 32g controls the heat pump unit 1. The boiling prohibition control unit 32g prohibits the boiling of water by the heat pump unit 1 from the setting start time to the specified time. The setting start time is set as a daytime time zone. The specified time is set as the time of the night time zone. In the present embodiment, the specified time is set as the start time of the night time zone. The boiling prohibition control unit 32g is an example of the boiling prohibition means of the present invention.

  The boiling prohibition control unit 32g is switched between the valid state and the invalid state by, for example, the changeover switch 33b. The changeover switch 33b is an example of a changeover unit. The boiling prohibition control unit 32g prohibits boiling of water by the heat pump unit 1 only when it is in the valid state. The boiling prohibition control unit 32g does not prohibit the boiling of water by the heat pump unit 1 when it is disabled.

  The time setting unit 32h is provided for setting the setting start time. The setting start time is input by the remote controller 33, for example. The setting start time input by the remote controller 33 is stored in the time setting unit 32h. The boiling prohibition control unit 32g prohibits boiling of water by the heat pump unit 1 from the setting start time stored in the time setting unit 32h to a specified time. The time setting unit 32h is an example of a time setting unit of the present invention.

  Next, the control procedure of the control device 32 in the present embodiment will be described. FIG. 2 is a flowchart showing a control procedure of the control device 32. The control device 32 determines whether the current time is the daytime time zone (step S1).

  When it is determined that the current time is not a daytime time zone, the control device 32 continues the determination in step S1. When it is determined that the current time is the daytime time zone, the control device 32 determines whether the boiling inhibition control unit 32g is in an effective state (step S2).

  When it is determined that the boiling prohibition control unit 32g is in the valid state, the control device 32 determines whether the current time has reached the setting start time set in the time setting unit 32h (step S3).

  When it is determined that the current time has reached the set start time, the control device 32 prohibits the boiling of water by the heat pump unit 1 by the boiling prohibition control unit 32g (step S4). When the boiling prohibition control unit 32g prohibits the water pumping by the heat pump unit 1, it determines whether the current time is the night time zone (step S5).

  When it is determined that the current time is not the night time zone, the boiling prohibition control unit 32g continues the determination in step S5. The boiling prohibition control unit 32g continues prohibiting the water pumping by the heat pump unit 1. When it is determined in step S5 that the current time is the night time zone, the boiling prohibition control unit 32g cancels the prohibition of water boiling by the heat pump unit 1 (step S6).

  After the prohibition of water boiling by the heat pump unit 1 is released, the night boiling control unit 32e causes the heat pump unit 1 to boil water at the night boiling start time (step S7). The night boiling control unit 32e controls the heat pump unit 1 so that the heat storage amount is equal to or higher than the target heat amount during the night time zone. When the heating of the water by the heat pump unit 1 in the night time zone ends, the control device 32 performs the determination in step S1 again.

  When it determines with the boiling prohibition control part 32g not being an effective state by step S2, the control apparatus 32 determines whether the heat storage amount is less than a starting heat amount by the daytime boiling control part 32f. Similarly, when it is determined in step S3 that the current time has not reached the set start time, the control device 32 determines whether the heat storage amount is lower than the startup heat amount by the daytime boiling control unit 32f (step S8). .

  When it is determined that the heat storage amount is less than the startup heat amount, the daytime boiling control unit 32f causes the heat pump unit 1 to start boiling water (step S9). The day-time boiling control unit 32f determines whether the heat storage amount exceeds the end heat amount when the heat pump unit 1 starts boiling water (step S10).

  When the daytime boiling control unit 32f determines that the heat storage amount does not exceed the end heat amount, the determination in step S10 is continued. The daytime boiling control unit 32 f continues boiling water with the heat pump unit 1. When it is determined that the heat storage amount exceeds the end heat amount, the daytime boiling control unit 32f causes the heat pump unit 1 to finish boiling water (step S11).

  When the boiling of water by the heat pump unit 1 is completed in step S11, the control device 32 determines whether the current time is the night time zone. Similarly, the control device 32 also determines whether or not the current time is in the night time zone even when it is determined in step S8 that the heat storage amount is not less than the startup heat amount (step S12).

  When it is determined in step S12 that the current time is the night time zone, the control device 32 performs the above-described step S7. Further, when it is determined in step S12 that the current time is not a night time zone, that is, the control device 32 performs the above-described step S2.

  The control device 32 repeatedly performs the above-described steps S1 to S12. Thereby, the boiling prohibition control unit 32g prohibits the water pumping by the heat pump unit 1 from the setting start time to the start time of the night time zone. In the present embodiment, the start time of the night time zone is an example of the specified time of the present invention.

  In the hot water supply apparatus of the present embodiment, water is boiled so as to ensure the target heat amount in the hot water storage tank 3 during the night time. Water boiling by the heat pump unit 1 is basically performed at night time. The night time zone is a time zone where the electricity bill is cheaper than the daytime zone. If it is this Embodiment, the user can use a water heater economically.

  The user of the water heater of the present embodiment sets an arbitrary time at which boiling is desired to be stopped as the setting start time. The setting start time is set in the time setting unit 32h. The boiling prohibition control unit 32g prohibits boiling of water by the heat pump unit 1 from the setting start time to the start time of the night time zone. From the setting start time to the start time of the night time zone is the day time zone. The daytime boiling control unit 32f does not cause the heat pump unit 1 to boil water during the daytime period from the setting start time to the start time of the nighttime period.

The setting start time is set, for example, as 20:00 when the bathing of all the user's family ends.
The time zone from the end of bathing to the start time of the night time zone is a daytime zone that does not require a large amount of heat. The water heater of the present embodiment prohibits boiling in the daytime period when a large amount of heat is not required. The daytime hours are expensive hours of electricity charges. The water heater according to the present embodiment can prevent useless boiling in an expensive time zone.

  The user can prevent unnecessary boiling by setting the setting start time in advance in the time setting unit 32h. The user does not need to perform an operation at every timing when it is desired to prevent unnecessary boiling. The setting start time set by the user is stored in the time setting unit 32h. Thereby, for example, even when it is desired to prevent unnecessary boiling up every day, the user does not need to perform the operation every day. By performing the setting in advance, the user can prevent unnecessary boiling without performing an operation every day when it is desired to prevent unnecessary boiling. By adopting the above configuration, the present embodiment provides a water heater that can prevent unnecessary boiling without increasing the burden on the user.

  The user can set the setting start time as an arbitrary time according to the living state. Also, the nighttime hours when electricity charges are cheap and the daytime hours when electricity charges are expensive differ depending on the user's electricity contract form. The night time zone and the day time zone may be set by the remote controller 33 in accordance with, for example, the user's electric contract form. According to this example, it is possible to prevent useless heating in an expensive time zone according to the life state of the user.

  The boiling prohibition control unit 32g of the present embodiment is switched between a valid state and an invalid state by the changeover switch 33b. The boiling prohibition control unit 32g prohibits boiling of water by the heat pump unit 1 only when it is in an effective state. The boiling prohibition control unit 32g does not prohibit the boiling of water by the heat pump unit 1 when it is in an invalid state.

  The boiling prohibition control unit 32g may cancel the prohibition of water boiling by the heat pump unit 1 when it is switched to an invalid state when the water pumping by the heat pump unit 1 is prohibited. Thereby, the user can cancel prohibition of water boiling by the heat pump unit 1 at an arbitrary time. Further, the boiling prohibition control unit 32g may not be switched between the valid state and the invalid state. The boiling prohibition control unit 32g may be, for example, always in a valid state.

  Further, the full function may be set in the control device 32 by the operation unit 33a, for example. When the full tank function is set, the controller 32 causes the heat pump unit 1 to boil water. The heat pump unit 1 performs boiling so that hot water is stored up to the full capacity of the hot water storage tank 3.

  When the full tank function is set, the control device 32 causes the heat pump unit 1 to boil water every time the heat storage amount decreases by a certain amount. A certain amount is set, for example, as the amount of heat that 100 L of water has in terms of 42 ° C. The heat pump unit 1 repeats the boiling of water so that hot water is stored up to the full capacity of the hot water storage tank 3 every time the amount of stored heat decreases by a certain amount.

  The full tank function set in the control device 32 is canceled at the start time of the night time zone. The full tank function in this example is an example of an operation function that is automatically released after a predetermined time has elapsed. The operation unit 33a is an example of a function setting unit.

  When the full tank function is set, the heat quantity of the water stored in the hot water storage tank 3 is maintained at a high value. The user can respond to a case where a large amount of high-temperature water is suddenly needed compared to the amount of high-temperature water used in the past certain period by the full tank function.

  The boiling prohibition control unit 32g may not prohibit the boiling of water by the heat pump unit 1 until the controller 32 is released after the full tank function is set. For example, when the full tank function is set when the water pumping by the heat pump unit 1 is prohibited, the boiling prohibition control unit 32g cancels the prohibition of water boiling by the heat pump unit. The boiling prohibition control unit 32g does not prohibit the water pumping by the heat pump unit 1 from the start of setting until the specified time until the full tank function is set and released.

  In this example, the user can prevent the heat pump unit 1 from prohibiting water boiling by setting the full tank function. This reduces the possibility that hot water runs out when a large amount of hot water is suddenly needed. Further, the user can cancel the prohibition of boiling while keeping the boiling prohibition control unit 32g in an effective state. The full tank function is automatically canceled at the start time of the night time zone. The user can prohibit boiling of water by the heat pump unit 1 without performing a new operation after the next day when the full tank function is used. In this example, the user can deal with a case where a large amount of high-temperature water is suddenly needed without requiring a large burden.

  The full tank function in this example is an example of an operation function that is automatically canceled after a lapse of a certain time. The operation function that is automatically canceled after a predetermined time has elapsed may be other than the full tank function. For example, when the prohibition of water boiling by the heat pump unit 1 is canceled by the hot water filling function, the possibility of hot water shortage due to hot water filling is reduced.

  In the present embodiment, the startup heat quantity is preset in the daytime boiling control unit 32f. The amount of startup heat may be reduced from the original value after the heat pump unit 1 has heated water by the daytime boiling control unit 32f, for example. The starting heat amount is set, for example, as the heat amount of 300 L of water in terms of 42 ° C. in the initial state. The daytime boiling control unit 32f, for example, causes the heat pump unit 1 to boil water, and then lowers the starting heat amount to the heat amount of 200 L of water in terms of 42 ° C.

  Further, the start heat amount and the end heat amount may be set as arbitrary heat amounts by the remote controller 33. Further, the start heat amount and the end heat amount may be calculated by the daytime boiling control unit 32f based on the heat amount used, the target heat amount, the heating capacity of the heat pump unit 1, and the like. The daytime boiling-up control unit 32f may vary the startup heat amount and the end heat amount depending on the day.

  In the present embodiment, the specified time is set as the start time of the night time zone. In addition to this example, the specified time may be set as an arbitrary time in the night time zone by the remote controller 33. The specified time may be, for example, the night boiling start time. For example, in a housing complex, a plurality of households each use a water heater. By making the specified time different for each hot water heater, it is possible to prevent the prohibition of boiling from being canceled at the same time. It is prevented that each water heater starts boiling simultaneously. If it is this example, concentration of the electric power load by a plurality of water heaters starting boiling simultaneously will be prevented.

  In addition, the daytime time slot | zone in the said embodiment is an example of the 1st time slot | zone of this invention. The night time zone is an example of a second time zone where the electricity bill is cheaper than the first time zone. The first time zone may be a time zone other than the daytime time zone according to, for example, the form of the electricity bill. The second time zone may be a time zone other than the night time zone as long as the electricity rate is cheaper than the first time zone.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described. The configuration of the water heater of the present embodiment is shown in FIG. 1 as in the first embodiment. FIG. 3 is a flowchart showing a control procedure of the control device 32 of the present embodiment. Steps S13 to S16 in FIG. 3 correspond to steps S1 to S4 in the first embodiment. Steps S19 to S20 correspond to steps S6 to S7 of the first embodiment. Steps S22 to S26 correspond to steps S8 to S12 of the first embodiment.

  Since the operation from step S13 to step S16 is the same as the operation from step S1 to step S4 of the first embodiment, the description thereof is omitted. When the boiling prohibition control unit 32g prohibits the water pumping by the heat pump unit 1 in step S16, the boiling prohibition control unit 32g determines whether the heat storage amount is equal to or greater than the first specified heat amount (step S17). The first specified heat amount is preset in the boiling prohibition control unit 32g. Note that the first specified heat amount may be set as an arbitrary heat amount by the remote controller 33.

  When it is determined that the heat storage amount is equal to or greater than the first specified heat amount, the boiling prohibition control unit 32g determines whether the current time is the night time zone (step S18). When it is determined that the current time is the night time zone, the boiling prohibition control unit 32g cancels the prohibition of water boiling by the heat pump unit 1 (step S19).

  Since the operation from step S19 to step S20 is the same as the operation from step S6 to step S7 of the first embodiment, the description thereof is omitted. When it is determined in step S18 that the current time is not the night time zone, the boiling prohibition control unit 32g performs the determination in step S17 again.

  When it is determined in step S17 that the heat storage amount is lower than the first specified heat amount, the boiling prohibition control unit 32g cancels the prohibition of water boiling by the heat pump unit 1 (step S21). When the prohibition of water boiling by the heat pump unit 1 is released, the control device 32 determines whether the heat storage amount is lower than the startup heat amount by the daytime boiling control unit 32f (step S22). Since the operation from step S22 to step S26 is the same as the operation from step S8 to step S12 of the first embodiment, the description thereof is omitted.

  The control device 32 according to the present embodiment repeatedly executes Step S13 to Step S26. The boiling prohibition control unit 32g cancels the prohibition of water boiling by the heat pump unit 1 when the heat storage amount falls below the first specified heat amount when the water pumping by the heat pump unit 1 is prohibited.

  The boiling prohibition control unit 32g continues prohibiting the water pumping by the heat pump unit 1 when the heat storage amount is equal to or more than the first specified heat amount when the water pumping by the heat pump unit 1 is prohibited. The boiling prohibition control unit 32g cancels the prohibition of water boiling by the heat pump unit 1 at the start time of the night time zone. Note that the start time of the night time zone is an example of a specified time. The specified time may be a time other than the start time of the night time zone as in the first embodiment.

  When the first specified heat quantity is set as a heat quantity larger than the startup heat quantity, the startup heat quantity is secured in the hot water storage tank 3. When the first specified heat quantity is set as a heat quantity smaller than the startup heat quantity, the first specified heat quantity is secured in the hot water storage tank 3. A certain amount of heat is secured in the hot water storage tank 3. Thereby, if it is this example, possibility that the hot water outbreak resulting from the boiling-up of the water by the heat pump unit 1 will be reduced is reduced.

  The boiling prohibition control unit 32g may be switched to an invalid state in step S21. The boiling prohibition control unit 32g may cancel the prohibition of water boiling by the heat pump unit 1 by switching to an invalid state.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described. The configuration of the water heater of the present embodiment is shown in FIG. 1 as in the first and second embodiments. FIG. 4 is a flowchart showing a control procedure of the control device 32 of the present embodiment. Steps S27 to S30 in FIG. 4 correspond to steps S1 to S4 in the first embodiment. Steps S34 to S35 correspond to steps S6 to S7 of the first embodiment. Steps S36 to S40 correspond to steps S8 to S12 of the first embodiment.

  Since the operation from step S27 to step S30 is the same as the operation from step S1 to step S4 of the first embodiment, the description thereof is omitted. The operation from step S36 to step S40 is the same as the operation from step S8 to step S12 in the first embodiment, and thus the description thereof is omitted. When the boiling of water by the heat pump unit 1 is prohibited in step S30, the controller 32 determines whether the heat storage amount is lower than the second specified heat amount by the hot water refilling control unit 32a (step S31).

  The second specified heat amount is set as a heat amount necessary for performing the hot water filling operation or the reheating operation. The second specified heat amount is set as, for example, the heat amount of 150 L of water in terms of 42 ° C. The second specified heat amount is preset in the hot water refilling control unit 32a. The second specified heat amount may be set as an arbitrary heat amount by the remote controller 33.

  When it is determined that the heat storage amount is less than the second specified heat amount, the hot water refilling control unit 32a prohibits the hot water filling operation and the chasing operation (step S32). When the hot water filling operation and the chasing operation are prohibited, the boiling prohibition control unit 32g determines whether or not the current time is a night time zone. Similarly, the boiling prohibition control unit 32g determines whether or not the current time is in the night time zone even when it is determined in step S31 that the heat storage amount is not lower than the second specified heat amount (step S33).

  When it is determined that the current time is the night time zone, the boiling prohibition control unit 32g cancels the prohibition of water boiling by the heat pump unit 1 (step S34). Since the operation from step S34 to step S35 is the same as the operation from step S6 to step S7 in the first embodiment, description thereof will be omitted. When it is determined in step S33 that the current time is not a night time zone, the hot water chasing control unit 32a performs the determination in step S31 again.

  The control device 32 according to the present embodiment repeatedly performs step S27 to step S40. The hot water replenishment control unit 32a prohibits the hot water replenishment operation and the reheating operation when the heat storage amount falls below the second specified heat amount when the water pumping by the heat pump unit 1 is prohibited by the boiling prohibition control unit 32g. To do.

  For example, when the hot water pouring control unit 32a receives an instruction from the remote controller 33 to start the hot water filling operation when the hot water filling operation is prohibited, the hot water pouring control unit 32a rejects the instruction. When the hot water replenishment control unit 32a rejects the instruction, the hot water filling side mixing valve 9 and the electromagnetic valve 10 which are examples of the hot water filling means are not filled.

  Similarly, when the hot water chasing control unit 32a receives an instruction from the remote controller 33 to start the chasing operation when the chasing operation is prohibited, for example, the hot water chasing chasing control unit 32a rejects the instruction. If the hot water replenishment control unit 32a rejects the instruction, the tank circulation pump 6 and the bath circulation pump 7 which are examples of the replenishing means do not heat the water in the bathtub.

  In addition, for example, when the hot water filling operation is prohibited during the hot water filling operation, the hot water filling chasing control unit 32a stops the hot water filling operation. Similarly, for example, when the chasing operation is prohibited during the chasing operation, the hot water chasing control unit 32a stops the chasing operation.

  According to the present embodiment, the hot water filling operation and the reheating operation are prevented from being performed in a state where a sufficient amount of heat is not secured in the hot water storage tank 3 while water heating by the heat pump unit 1 is prohibited. Is done. Thereby, the possibility that hot water runs out is reduced. In FIG. 4, the specified time is the start time of the night time zone. The specified time may be a time other than the start time of the night time zone, as in the first and second embodiments.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described. The configuration of the water heater according to the present embodiment is shown in FIG. FIG. 5 is a flowchart showing a control procedure of the control device 32 of the present embodiment. Steps S41 to S43 in FIG. 5 correspond to steps S1 to S3 in the first embodiment. Steps S46 to S48 correspond to steps S5 to S7 of the first embodiment. Step S49 to step S53 correspond to step S8 to step S12 of the first embodiment.

  Since the operation from step S41 to step S43 is the same as the operation from step S1 to step S3 of the first embodiment, the description thereof is omitted. When it is determined in step S43 that the current time has reached the set start time, the controller 32 determines whether the heat storage amount is equal to or greater than the third specified heat amount by the boiling prohibition control unit 32g (step S44).

  The third specified heat amount is set as a heat amount that is predicted to be used when water boiling by the heat pump unit 1 is prohibited. The third specified heat amount is preset in the boiling prohibition control unit 32g. The third specified heat amount may be set as an arbitrary heat amount by the remote controller 33.

  When it is determined that the heat storage amount is equal to or greater than the third specified heat amount, the boiling prohibition control unit 32g prohibits the water pumping by the heat pump unit 1 (step S45). When the boiling prohibition control unit 32g prohibits the water pumping by the heat pump unit 1, it determines whether the current time is the night time zone (step S46). Since the operation from step S46 to step S48 is the same as the operation from step S5 to step S7 of the first embodiment, the description thereof is omitted.

  When it is determined in step S44 that the heat storage amount is lower than the third specified heat amount, the control device 32 determines whether the heat storage amount is lower than the startup heat amount by the daytime boiling control unit 32f (step S49). Since the operation from step S49 to step S53 is the same as the operation from step S8 to step S12 of the first embodiment, the description thereof is omitted.

  The control device 32 according to the present embodiment repeatedly performs step S41 to step S53. The boiling prohibition control unit 32g does not start prohibiting the water pumping by the heat pump unit 1 when the heat storage amount is lower than the third specified heat amount at the setting start time. The boiling prohibition control unit 32g starts prohibiting the water pumping by the heat pump unit 1 when the heat storage amount is equal to or greater than the third specified heat amount.

  According to the present embodiment, it is possible to prevent water boiling by the heat pump unit 1 from being prohibited when a sufficient amount of heat is not secured in the hot water storage tank 3. Thereby, the possibility that hot water runs out is reduced. In FIG. 5, the specified time is the start time of the night time zone. The specified time may be a time other than the start time of the night time zone, as in the first embodiment, the second embodiment, and the third embodiment.

Embodiment 5. FIG.
Next, a fifth embodiment of the present invention will be described. The configuration of the water heater according to the present embodiment is shown in FIG. FIG. 6 is a flowchart showing a control procedure of the control device 32 of the present embodiment. Steps S54 to S56 in FIG. 6 correspond to steps S1 to S3 in the first embodiment. Steps S59 to S61 correspond to steps S5 to S7 of the first embodiment. Steps S62 to S66 correspond to steps S8 to S12 of the first embodiment.

  Since the operation from step S54 to step S56 is the same as the operation from step S1 to step S3 of the first embodiment, the description thereof is omitted. When it is determined in step S56 that the current time has reached the set start time, the control device 32 determines, for example, whether there is a hot water filling operation or a chasing operation result by the hot water pouring control unit 32a (see FIG. Step S57).

  If the controller 32 determines that there is a record of the hot water filling operation or the reheating operation on that day, the boiling prohibition control unit 32g prohibits the water pumping by the heat pump unit 1 (step S58). When the boiling prohibition control unit 32g prohibits the water pumping by the heat pump unit 1, it determines whether the current time is the night time zone (step S59). Since the operation from step S59 to step S61 is the same as the operation from step S5 to step S7 in the first embodiment, the description thereof is omitted.

  If it is determined in step S57 that there is no actual hot water filling operation or chasing operation in the day, the control device 32 determines whether the heat storage amount is lower than the startup heat amount by the daytime boiling control unit 32f (step S62). Since the operation from step S62 to step S66 is the same as the operation from step S8 to step S12 of the first embodiment, description thereof is omitted.

  The control device 32 according to the present embodiment repeatedly performs step S41 to step S53. The boiling prohibition control unit 32g does not start prohibiting the water pumping by the heat pump unit 1 when the hot water filling operation or the reheating operation is not performed at the setting start time. The boiling prohibition control unit 32g starts prohibiting boiling of water by the heat pump unit 1 when a hot water filling operation or a reheating operation is performed between the setting start time of the day and the specified time.

  The hot water filling operation and the chasing operation generally require a large amount of heat. For this reason, when the hot water filling operation and the reheating operation are performed when the water pumping by the heat pump unit 1 is prohibited, the hot water may run out.

  The boiling prohibition control unit 32g according to the present embodiment does not prohibit boiling of water by the heat pump unit 1 when there is no record of performing the hot water filling operation or the reheating operation on the day. Thereby, when boiling of water by the heat pump unit 1 is prohibited, the possibility that the hot water runs out due to the hot water filling operation and the chasing operation being performed is reduced. In FIG. 6, the specified time is the start time of the night time zone. The specified time may be a time other than the start time of the night time zone, as in the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment.

  DESCRIPTION OF SYMBOLS 1 Heat pump unit, 2 Hot water storage unit, 3 Hot water storage tank, 3a Heat pump outlet, 3b Water supply port, 3c Reheating return port, 3d Heat pump return port, 3e Hot water supply port, 3f Reheating outlet, 4 Heat exchanger, 5 Heat pump circulation Pump, 6 tank circulation pump, 7 bath circulation pump, 8 general hot water supply side mixing valve, 9 bath hot water supply side mixing valve, 10 solenoid valve, 11a first temperature sensor, 11b second temperature sensor, 11c third temperature sensor, 11d first 4 temperature sensor, 11e 5th temperature sensor, 12 heat pump forward piping, 13 heat pump return piping, 14 heating circulation circuit, 15 hot water storage tank temperature sensor, 16 water supply pipe, 16a first branch point, 16b second branch point, 17 water supply temperature Sensor, 18 hot water supply pipe, 18a Third branch point, 19 Mixed hot water supply pipe, 20 Hot water flow sensor, 21 Hot water temperature sensor, 22 Mixed bath pipe, 23 Bath outlet pipe, 24 Bath flow sensor, 25 Bath temperature sensor, 26 Bath circulation pipe, 27 Bath return piping, 28 Bath circulation circuit, 29 Tank return piping, 30 Tank return piping, 31 Tank circulation circuit, 32 Control device, 32a Hot water replenishment control section, 32b Heat storage amount calculation section, 32c Use heat amount calculation section, 32d Target Calorie calculation unit, 32e Night heating control unit, 32f Day heating control unit, 32g Heating prohibition control unit, 32h Time setting unit, 33 Remote controller, 33a operation unit, 33b changeover switch, 33c display unit

Claims (9)

Boiling means for boiling water and supplying it to a hot water storage tank;
First boiling control means for causing the boiling means to boil water in a first time zone;
Second boiling control means for causing the boiling means to boil water in a second time zone where the electricity bill is cheaper than the first time zone;
Boil prohibiting means for prohibiting boiling of water by the boiling means from a setting start time of the first time zone to a specified time of the second time zone;
Time setting means for setting the setting start time;
A water heater equipped with.   The water heater according to claim 1, wherein the specified time is a start time of the second time zone.   The hot water supply device according to claim 1, wherein the specified time is a time at which the second boiling control means causes the boiling means to start boiling water. Switching means for switching between the effective state and the invalid state of the boiling prohibiting means,
The hot water heater according to any one of claims 1 to 3, wherein the boiling prohibiting means prohibits boiling of water by the boiling means only when being enabled by the switching means. A function setting means for setting an operation function that is automatically canceled after a predetermined time has elapsed,
The boiling prohibiting means is configured to prevent water from being heated by the boiling means from the setting start time to the specified time from when the operation function is set by the function setting means until it is released after the predetermined time has elapsed. The water heater according to any one of claims 1 to 4, wherein boiling of the water is not prohibited. A heat storage amount calculating means for calculating a heat amount of the water stored in the hot water storage tank;
The boiling prohibiting means is configured to prevent the boiling of water by the boiling means when the amount of heat calculated by the heat storage amount calculating means is less than a first specified heat amount when the boiling of water by the boiling means is prohibited. The water heater according to any one of claims 1 to 5, wherein the prohibition is canceled. A heat storage amount calculating means for calculating a heat amount of the water stored in the hot water storage tank;
Filling means for filling the bathtub with the water stored in the hot water tank,
Reheating means for heating water in the bathtub;
When the amount of heat calculated by the heat storage amount calculating means falls below the second specified heat amount when the boiling of water is prohibited by the boiling prohibiting means, the hot water filling by the hot water filling means and the reheating are performed. Hot water replenishment control means for prohibiting water heating by means of,
The water heater according to any one of claims 1 to 5, further comprising: A heat storage amount calculating means for calculating a heat amount of the water stored in the hot water storage tank;
The boiling prohibiting means does not start prohibiting the boiling of water by the boiling means when the heat amount calculated by the heat storage amount calculating means is less than a third specified heat amount at the setting start time, 2. The prohibition of water boiling by the boiling means is started when the heat quantity calculated by the heat storage quantity calculation means between the setting start time and the specified time becomes equal to or greater than a third specified heat quantity. The water heater according to any one of claims 4 to 5. Filling means for filling the bathtub with the water stored in the hot water tank,
Reheating means for heating water in the bathtub;
With
The boiling prohibiting means is configured to boil water by the boiling means when the hot water filling means by the hot water filling means or the water heating by the reheating means has never been performed by the setting start time of the day. When the prohibition of raising is not started at the setting start time and the water is heated by the hot water filling means or the reheating means between the setting start time and the specified time of the day. The water heater according to any one of claims 1 to 4, wherein prohibition of water boiling by the boiling means is started.

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