JP2007085651A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater preventing hot water shortage even when heating operation is suddenly started before supplying hot water to fill a bathtub. <P>SOLUTION: The hot water storage type water heater is provided with a tank 10, a heat source part 17 boiling hot water in the tank 10, and remaining hot water temperature detecting parts 19a-19c detecting a remaining hot water amount in the tank 10. Normal hot water shortage determination is carried out by the remaining hot water temperature detecting part 19a. If there is a past record of carrying out the heating operation within a predetermined period, a necessary amount of hot water can be secured beforehand in the tank 10 by changing to determination by the remaining hot water temperature detecting part 19c to start boiling earlier than the normal hot water shortage determination, and hot water shortage can be prevented by securing a sufficient amount of hot water beforehand with respect to the heating operation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus that includes a heating system that performs a heating operation using hot water in a tank and performs boiling so that the tank does not run out of hot water.

  Conventionally, this type of hot water storage type hot water heater boils hot water in a tank when it detects that the amount of hot water in the tank has become a predetermined amount or less by means of a remaining hot water temperature detector that detects the amount of hot water in the tank. (For example, refer to Patent Document 1).

  FIG. 8 shows a conventional hot water storage type water heater described in Patent Document 1. In FIG. In FIG. 8, 1 is a hot water storage tank, 2 is a heat source section, 3a to 3d are remaining hot water temperature detection sections, 4 is a mixing valve, 5 is a bathtub, 6 is a currant, and 7 is a shower.

In this hot water storage type water heater, boiling is performed by midnight power with a low charge in the late night hours, and hot water is stored in the tank 1. Thereafter, when the user performs hot water supply to the bathtub 5 during the daytime, hot water stored in the tank 1 and water are mixed by the mixing valve 4 and supplied at a predetermined temperature. Similarly, when hot water is supplied from the currant 6 and the shower 7, hot water having a predetermined temperature is supplied by the mixing valve 4. Then, the amount of remaining hot water in the tank 1 is decreased by supplying hot water, and when the remaining hot water temperature detecting unit 3 detects that the amount of remaining hot water is equal to or less than a predetermined remaining hot water amount, the heat source unit 2 is driven to prevent hot water from running out. Boiling hot water in the water tank 1 is performed.
Japanese Patent Laid-Open No. 2004-245459

  However, the conventional configuration performs a boiling operation to prevent hot water shortage by detecting the amount of remaining hot water that has decreased due to hot water supply, and performs a heating operation when a heating system is installed. If the bath is filled with hot water that continuously supplies a lot of hot water while the water is being used, even if a decrease in the amount of remaining hot water is detected and boiling is started, the hot water may run out. In this way, in the conventional boiling operation, if the heating operation that continuously consumes a lot of hot water and the hot water supply that fills the bath hot water that also continuously consumes a lot of hot water are performed at the same time, the hot water can run out. The nature would be high.

  The present invention solves the above-mentioned conventional problem, and when there is a track record of performing heating operation within a predetermined period in the past, before the user starts hot water supply to the bathtub, When the remaining hot water temperature detector detects that the amount of hot water has fallen below the specified amount, the required amount of hot water can be secured in advance by boiling the hot water in the tank earlier than when there is no heating experience. An object is to prevent the hot water from running out even if the heating operation is suddenly started before the hot water supply.

  In order to solve the above-described conventional problems, the hot water storage type water heater of the present invention has a history of performing heating operation within a predetermined period in the past, before the user starts bathing hot water supply to the bathtub. When the remaining hot water temperature detection unit detects that the hot water in the tank has fallen below a predetermined amount, the hot water in the tank is boiled up earlier than in the case where there is no record of heating.

  As a result, the necessary amount of hot water can be secured in advance, and even if the heating operation is suddenly started before the hot water supply to the bath hot water, the hot water is prevented from running out.

  The hot water storage type water heater of the present invention has a track record of performing a heating operation within a predetermined period in the past, and can sufficiently boil up the amount of remaining hot water required for bath hot water supply and heating operation in advance. By securing the amount of remaining hot water, it is possible to prevent the hot water from running out even if the heating operation is suddenly started before the hot water supply to the bath, so that you can bathe comfortably and perform the heating operation comfortably. be able to.

  The first invention is a heating operation using a tank for storing hot water, a heat source for boiling the hot water in the tank, a remaining hot water temperature detecting unit for detecting the amount of remaining hot water in the tank, and hot water in the tank. A heating system unit that performs a bath operation and a bath system unit that performs a bath operation.If there is a track record of performing a heating operation within a predetermined period in the past, a predetermined amount of hot water in the tank is required before the bath operation starts. When the remaining hot water temperature detection unit detects that the temperature has fallen below, the amount of remaining hot water required for the bath hot water supply and heating operation can be raised in advance by performing a heating operation using the heat source unit. As a result, it is possible to prevent the hot water from running out and to bathe comfortably, and to perform the heating operation comfortably without running out of hot water.

  In particular, the second aspect of the present invention is a heating operation performed when the remaining hot water temperature detection unit detects that the amount of hot water in the tank has fallen below a predetermined amount before the bath operation of the first aspect of the invention is started. A bath operation storage unit that stores the time when the bath operation was performed within a predetermined period is provided, and after reaching the time stored in the bath operation storage unit, by prohibiting the boiling operation, the user's When bath water filling is not performed in the life pattern, it is possible to prevent the heating operation from being performed unnecessarily, and it is possible to suppress the use of daytime power that is higher than midnight power.

  In particular, in the first or second invention, when there is a track record of performing the heating operation in the past predetermined period, the third invention is the heat source section until the hot water filling is completed after the bath operation is started. By performing the heating operation according to, even if the heating operation is suddenly started during the bath hot water supply, it is possible to prevent the hot water from running out.

  A fourth invention is a heating operation using a tank for storing hot water, a heat source for boiling the hot water in the tank, a remaining hot water temperature detecting unit for detecting the amount of remaining hot water in the tank, and hot water in the tank. When the remaining hot water temperature detecting unit detects that the hot water in the tank has fallen below a predetermined amount, the heating operation was performed within the past predetermined period in the control for performing the heating operation by the heat source unit. In cases where there is a track record and when there is a track record, if there is a track record, the number of judgments to start the boiling operation is increased, so that the heating operation is started earlier, so that the heat insulation after the bath water supply is completed. A sufficient amount of remaining hot water can be secured in preparation for the heating operation even during operation or after completion of the bath operation, and it is possible to prevent the hot water from running out during the heating operation and to perform a comfortable heating operation.

  A fifth aspect of the invention includes a tank for storing hot water, a heat source for boiling the hot water in the tank, a remaining hot water temperature detecting unit for detecting the amount of remaining hot water in the tank, and a feed water temperature detecting for detecting a feed water temperature to the tank. And a heating system unit that performs heating operation using hot water in the tank, and the total amount of tank at the end time of the midnight time zone depends on the amount of remaining hot water by the remaining hot water temperature detection unit and the supply water temperature by the feed water temperature detection unit In the peak shift control that calculates the boiling start time so as to boil up, if there is a track record of performing heating operation in the past predetermined period, the tank start-up in the midnight time zone by raising the boiling start time Even if the heating operation is suddenly started, it is possible to prevent the hot water from running out and to perform a comfortable heating operation.

In the sixth aspect of the invention, in particular, when the performance of the heating operation in the past predetermined period of the fifth invention is in the midnight time zone, the heating start time is increased by advancing the boiling start time of the peak shift control. Even if it is suddenly started, it is possible to prevent the hot water from running out and to perform a comfortable heating operation.

  The seventh invention includes a tank for storing hot water, a heat source for boiling the hot water in the tank, a remaining hot water temperature detecting unit for detecting the amount of remaining hot water in the tank, and a feed water temperature detecting for detecting the feed water temperature to the tank. Unit, a heating system unit that performs heating operation using hot water in the tank, and an operation unit that performs a reserved operation of the heating system unit, the amount of remaining hot water by the remaining hot water temperature detection unit, and the feed water temperature by the feed water temperature detection unit By the peak shift control that calculates the boiling start time so that the entire tank is boiled at the end time of the midnight time zone, when the setting to start the heating operation during the midnight time zone by the reserved operation of the operation unit is performed By raising the boiling start time, a sufficient amount of remaining hot water can be secured in advance to prevent running out of hot water after the heating operation is started, and a comfortable heating operation can be performed.

  The eighth invention includes a tank for storing hot water, a heat source for boiling the hot water in the tank, a remaining hot water temperature detecting unit for detecting the amount of remaining hot water in the tank, and a feed water temperature detecting for detecting the feed water temperature to the tank. And a heating system unit that performs heating operation using hot water in the tank, and the total amount of tank at the end time of the midnight time zone depends on the amount of remaining hot water by the remaining hot water temperature detection unit and the supply water temperature by the feed water temperature detection unit In peak shift control that calculates the boiling start time so as to boil, if heating operation is performed during the peak shift until the boiling start time is reached, the peak shift is canceled and the tank is fully heated. The heating operation prevents the entire tank from boiling up at the end time of midnight hours, and the boiling is inadvertent to prevent the hot water from running out during the daytime hours. It is possible to prevent the break.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a block diagram showing a hot water storage type hot water heater according to an embodiment of the present invention.

  In FIG. 1, reference numeral 10 denotes a tank for storing hot water, and has a hot water supply pipe 11 in the upper part and a water supply pipe 12 in the lower part of the tank 10. The water supply pipe 12 is connected from a water supply port 13 to which a water supply is connected through a pressure reducing valve 14 for reducing the water pressure. In the tank 10, hot water is separated into the upper part and water is separated into the lower part due to the difference in specific gravity, and when boiling the hot water in the tank 10, hot water is stored from the upper part of the tank 10, thereby forming a layer in which the hot water is pushed down. Accumulated. When hot water is supplied from the hot water supply pipe 11, water is supplied from the water supply pipe 12 into the tank 10 and the tank 10 is always filled with hot water. A boiling pipe 15 connected from the lower part to the upper part is connected to the tank 10, and a boiling pump 16 and a heat source unit 17 are interposed in the boiling pipe 15. By driving the boiling pump 16, hot water at the lower part of the tank 10 is supplied to the heat source part 17, and after the hot water is overheated by the heat source part 17, the hot water is returned to the upper part of the tank 10 to be stored. At this time, the heat source unit 17 is a heat pump or a heater having a heat pump cycle mechanism.

In general, a hot water storage type hot water heater is a night heat storage type hot water heater that uses cheap late-night power, and boils the entire amount of hot water in the tank 10 at night. Therefore, the user uses the hot water boiled at night for hot water supply in the daytime, and when the hot water in the tank 10 decreases, the hot water is heated by the expensive daytime power to prevent the hot water from running out. Will be performed. First, boiling in the midnight time zone includes a water supply temperature detection unit 18 that detects a water supply temperature to the tank 10 based on a water temperature flowing into the heat source unit 17, and a remaining hot water temperature detection unit 19a to 19c that detects the amount of remaining hot water in the tank 10. In addition, by the output of the heat source unit 17, the boiling start time is calculated so that the entire amount of the tank 10 is boiled at the end time of the midnight time zone, and peak shift control is performed to avoid power concentration at the start of the midnight time zone. In the daytime period, when any of the predetermined remaining hot water temperature detection units 19a to 19d detects that the hot water in the tank 10 has decreased, the heat source unit 17 performs boiling to prevent the hot water from running out. .

  Next, the bath system unit 50 will be described. When the user performs either hot water supply to the curan 20, the shower 21, or hot water supply to the bathtub 22, the hot water supplied from the tank 10 through the hot water supply pipe 11 and the pressure reducing valve 14 reduce the water supply. The mixing valve 23 mixes the water supplied through the pipe 12. A target temperature to be mixed by the mixing valve 23 is set by a bath temperature switch 25 of the operation unit 24. Then, the mixing valve 23 is driven so that the hot water supply temperature detection unit 26 reaches the target temperature. When bath water is supplied to the bathtub 22, the bath operation switch 27 of the operation unit 24 is turned on. When the bath operation switch 27 is turned on, the hot water supply valve 28 opens to supply hot water at a set temperature, and when the water level detection unit 30 detects that the hot water amount set by the hot water amount setting switch 29 of the operation unit 24 has been reached. Bath hot water supply stops. After completion of the hot water supply, the bath 22 is kept warm until the bath temperature switch 25 is turned off until the bath operation switch 27 is turned off. In the heat insulation operation, first, the bath circulation pump 31 is driven, and the bath temperature detector 32 checks the water temperature of the bathtub 22. When the temperature detected by the bath temperature detection unit 32 is lower than the temperature set by the bath temperature switch 25, hot water in the upper part of the tank 10 flows into the bath heat exchanger 43 by driving the bath heating pump 33. To do. The hot water in the tank 10 is returned to the lower part of the tank 10 after the hot water in the bathtub 22 is heated by the bath heat exchanger 43. The hot water temperature of the bathtub 22 gradually rises due to the heating by the heat exchange, and when the temperature detected by the bath temperature detecting unit 32 exceeds the temperature set by the bath temperature switch 25, the bath heating pump 33 is stopped and heated. Exit.

  Next, the heating system unit 51 will be described. When the user performs the heating operation, the heating operation switch 34 of the operation unit 24 is turned on. When the heating operation switch 34 is turned on, the heating circulation pump 35 is driven to check the water temperature of the heating load 37 by the heating temperature detector 36. The heating load 37 includes a floor heating panel, a bathroom dryer, a hot air fan vector, and the like, and the heating load is not specified in this specification. When the temperature detected by the heating temperature detector 36 is lower than the temperature set by the heating temperature switch 38, the hot water in the upper part of the tank 10 flows into the heating heat exchanger 40 by driving the heating heating pump 39. To do. The hot water in the tank 10 is returned to the lower part of the tank 10 after heating the hot water of the heating load 37 by the heating heat exchanger 40. The hot water temperature of the heating load 37 gradually rises due to heating by this heat exchange, and when the temperature detected by the heating temperature detecting unit 36 exceeds the temperature set by the heating temperature switch 38, the heating / heating pump 39 is stopped. Finish heating.

  Next, the control flow of FIG. 2 will be described.

  When the user performs hot water supply in the morning time bathing or cooking, the hot water stored in the tank 10 decreases. Since the hot water storage capacity of the tank 10 is finite, if hot water is supplied exceeding the hot water storage capacity, the hot water will eventually run out. In order to prevent the hot water from running out, it is necessary to boil the hot water in the tank 10 during the daytime, and when the remaining hot water temperature detection unit 19a detects a decrease in hot water, the heat source unit 17 performs boiling. At this time, even when the hot water is reduced to the remaining hot water temperature detecting unit 19a and the bath operation switch 26 is turned on and the hot water supply is started, the heating operation switch is further turned on. When 34 is turned on and the heating operation is started, a lot of hot water is continuously consumed, and the remaining hot water remaining in the tank 10 may run out.

Therefore, first, it is determined whether or not the user has a history of performing the heating operation within the past predetermined period by the heating operation switch 34 (step 001). For example, if there is no record of performing the heating operation within the past week, it is determined that the possibility of performing the heating operation by midnight is low, and the normal hot water temperature detection unit 19a performs the hot water outage determination (Step S1). 002). If there is a track record of performing the heating operation, it is determined that there is a high possibility that the heating operation will be performed by midnight, and switching to a determination to start boiling earlier than the normal hot water determination. At this time, it is determined whether bath hot water supply has been performed (step 003). If bath hot water supply has already been implemented, the possibility of continuing to consume a large amount of hot water continuously is only heating operation, and the remaining hot water temperature detection unit prevents hot water due to hot water supply during heating operation and cooking, etc. The determination at 19b is performed (step 004). If bath hot water supply has not been carried out, the remaining hot water temperature detection unit 19c determines that the hot water has run out in order to prevent hot water due to hot water supply during bath hot water supply, heating operation, cooking, etc. Is secured (step 005).

  Next, the control flow in FIG. 3 will be described.

  Depending on the lifestyle pattern of the user, bathing may not be performed. When bathing is not performed in the control flow of FIG. 2, boiling is performed to prevent the remaining hot water temperature detection unit 19c from running out until the tank 10 is fully heated in the late-night time zone. become. A sufficient amount of hot water is secured against running out of hot water, but there will be no problem, but it will inadvertently raise the expensive daytime hours. As a response to this, first, the user determines whether or not there is a track record of performing the heating operation within the predetermined period in the past by the heating operation switch 34 (step 010). For example, if there is no record of performing the heating operation within the past week, it is determined that the possibility of performing the heating operation by midnight is low, and the normal hot water temperature detection unit 19a performs the hot water outage determination (Step S1). 011). If there is a track record of performing the heating operation, it is determined that there is a high possibility that the heating operation will be performed by midnight, and switching to a determination to start boiling earlier than the normal hot water determination. At this time, it is determined whether or not bath hot water supply has been performed (step 012). If bath hot water supply has already been implemented, the possibility of continuing to consume a large amount of hot water continuously is only heating operation, and the remaining hot water temperature detection unit prevents hot water due to hot water supply during heating operation and cooking, etc. The determination at 19b is performed (step 013). If bath hot water supply has not been carried out, it is necessary to prevent hot water from being blown off by hot water supply in bath hot water supply, heating operation and cooking, etc., but at this time, depending on the user's life pattern, bathing is not performed There is. Therefore, a determination is made by the bath operation storage unit 41 that stores the time when the bath operation was performed within the past predetermined period (step 014). In this bath operation storage unit 41, for example, the time when the user has turned on the bath operation switch 26 for the past week is stored, and the latest time is selected, and when that time is passed, the bath hot water supply Is determined not to be performed. In addition, as the determination of the time, the latest time may be excluded, the sudden use as the second latest time may be excluded, or the average of the time may be determined. In addition to the time when the bath operation switch 26 is turned on, the determination may be made based on the time when the bath hot water supply is completed. If the time determined in this way has passed, it will be treated as if the hot water supply has been completed, and the possibility of continually consuming a lot of hot water is only heating operation, and hot water supply for heating operation and cooking, etc. In order to prevent running out of hot water, a determination is made at the remaining hot water temperature detector 19b (step 013). Therefore, when the bath hot water supply has not been performed and the judgment time within the past predetermined period stored by the bath operation storage unit 41 has not passed, the hot water by the hot water supply by the hot water supply by the bath hot water supply, heating operation, cooking, etc. In order to prevent running out, the remaining hot water temperature detector 19c determines whether the hot water has run out, and a sufficient amount of hot water is secured in advance (step 015).

  Next, the control flow of FIG. 4 will be described.

Even if the tank 10 has a hot water supply that does not run out even if the hot water supply in the hot water bath and cooking is performed, the heating operation is performed when the hot water supply in the hot water bath is performed. If done, there is a risk of running out of hot water. Therefore, when bath hot water supply is performed by turning on the bath operation switch 26 (step 020), it is determined whether or not there is a track record of performing the heating operation in the past predetermined period (step 021). For example, if there is no record of performing the heating operation within the past week, it is determined that the possibility of performing the heating operation is low. If there is a track record of heating operation, it is determined that there is a possibility that the heating operation may be performed during bath hot water supply, and the tank 10 is boiled in order to prevent hot water from being consumed due to mass consumption of hot water due to simultaneous operation. (Step 022). The tank 10 is heated until the hot water supply to the bath is completed, and is not performed unnecessarily. However, if the heating operation is performed at this time, or if it is determined that the hot water will run out even if it is not performed, the boiling is continued even after the bath hot water supply is completed.

  Next, the control flow of FIG. 5 will be described.

  In the midnight time zone, peak shift control is performed and the tank 10 is fully boiled by cheap midnight power. The calculation of this peak shift control is based on the supply water temperature to the tank 10 and the amount of remaining hot water in the tank 10. (Step 030). Therefore, when the heating operation is started during boiling, a lot of hot water is continuously consumed, and even during boiling, there is a possibility that the hot water will run out, and the tank 10 is used at midnight. There is a risk that the entire amount cannot be heated. Therefore, it is determined whether or not there is a track record of performing the heating operation in the past predetermined period (step 031). For example, if there is no record of performing the heating operation within the past week, it is determined that the possibility of performing the heating operation is low, and the first peak shift calculation value is left as it is. If there is a track record of heating operation, it is determined that heating operation may be performed during boiling, and the time for boiling the amount of hot water consumed by heating operation is added to the first peak shift calculation value (step 032). The addition time may be, for example, one hour. When the current time is added to the peak shift time (step 033), the heating of the entire tank 10 is started (step 034), thereby securing a sufficient amount of hot water in advance for the heating operation. Can do. In addition, the performance determination of the heating operation in Step 031 determines whether the heating operation is performed during the daytime period or during the midnight time period, and only when the heating operation is performed during the midnight time period. It is good also as what performs the subsequent process supposing there exists the performance of a driving | operation. As a result, when the heating operation is performed only during the daytime period, it is possible to prevent boiling from starting earlier and to prevent wasteful heat loss.

  Next, the control flow of FIG. 6 will be described.

  If the reservation switch 42 of the operation unit 24 is used to make a reservation for heating operation at midnight, it is certain that the heating operation will be performed. It is necessary to prevent the entire amount from being unable to be boiled. Therefore, first, normal peak shift control is calculated to obtain the boiling start time (step 040). Then, the time when the heating operation is reserved (step 041) and the time when the midnight time period ends are compared, and the addition time is obtained from the time difference (step 042). For example, if the reserved time for heating operation is 5 o'clock and the end time of the midnight time zone is 7 o'clock, the difference of 2 hours is set as the addition time. Further, the addition time may be adjusted to one half of the time or four times the half, depending on the capability of the heat source unit 17. Then, when the current time is added to the peak shift time (step 043), the boiling of the entire tank 10 is started (step 044), thereby securing a sufficient amount of hot water in advance for the heating operation. Can do.

  Next, the control flow of FIG. 7 will be described.

In the midnight time zone, in the peak shift control, the boiling of the entire amount of the tank 10 is not started until the current time reaches the peak shift time, but when the cell operation is started during this time, a lot of hot water is continuously supplied. There is a possibility that the water will run out even if the boiling is started at the peak shift time, or the tank 10 cannot be completely boiled in the midnight time zone. Therefore, first, the peak shift control is calculated to obtain the boiling start time (step 050). Then, when the heating operation is started (step 052) until the current time reaches the peak shift time (step 051), heating of the entire amount of the tank 10 is started even if the peak shift time has not been reached (step 052). 053), the amount of hot water for heating operation can be secured.

  As described above, the hot water storage type water heater according to the present invention can be applied to uses such as an electric water heater and a heat pump water heater as a device for boiling the tank when it is determined that the hot water runs out due to the heating operation.

The block diagram of the hot water storage type water heater in Embodiment 1 of this invention Flowchart of hot water storage type water heater in Embodiment 1 of the present invention Flowchart of hot water storage type water heater in Embodiment 1 of the present invention Flowchart of hot water storage type water heater in Embodiment 1 of the present invention Flowchart of hot water storage type water heater in Embodiment 1 of the present invention Flowchart of hot water storage type water heater in Embodiment 1 of the present invention Flowchart of hot water storage type water heater in Embodiment 1 of the present invention Configuration diagram of a conventional hot water heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tank 17 Heat source part 18 Supply water temperature detection part 19a-19c Remaining hot water temperature detection part 24 Operation part 41 Bath operation memory | storage part 50 Heating system part 51 Bath system part

Claims (8)

A tank for storing hot water, a heat source for boiling the hot water in the tank, a remaining hot water temperature detecting unit for detecting the amount of remaining hot water in the tank, and a heating system for performing heating operation using the hot water in the tank And a bath system unit that performs bath operation, and there is a track record of performing heating operation in the past predetermined period, the hot water in the tank has fallen below a predetermined amount before the bath operation is started When the remaining hot water temperature detection unit detects this, a hot water storage type hot water heater that performs a boiling operation by the heat source unit. It has a bath operation storage unit that stores the time when the bath operation was performed in the past predetermined period,
After reaching the time stored in the bath operation storage unit, when there is a track record of performing the heating operation within a predetermined period in the past, boiling is performed when the hot water in the tank falls below a predetermined amount. The hot water storage type water heater according to claim 1, wherein the raising operation is prohibited. The hot water storage type hot water supply according to claim 1 or 2, wherein when there is a record of performing the heating operation within a predetermined period in the past, the boiling operation by the heat source unit is performed from the start of the bath operation until the hot water filling is completed. Machine. A tank for storing hot water, a heat source for boiling the hot water in the tank, a remaining hot water temperature detecting unit for detecting the amount of remaining hot water in the tank, and a heating system for performing heating operation using the hot water in the tank And when the remaining hot water temperature detection unit detects that the hot water in the tank has fallen below a predetermined amount, the heating operation was performed within the past predetermined period in the control for performing the heating operation by the heat source unit. A hot water storage type hot water heater that starts boiling operation earlier by increasing the determination of a predetermined amount to start boiling operation when there is a track record and when there is no track record. A tank for storing hot water, a heat source for boiling the hot water in the tank, a remaining hot water temperature detecting unit for detecting the amount of remaining hot water in the tank, a feed water temperature detecting unit for detecting the feed water temperature to the tank, A heating system unit that performs heating operation using the hot water in the tank, and the total amount of the tank at the end time of the midnight time zone according to the remaining hot water amount by the remaining hot water temperature detection unit and the feed water temperature by the feed water temperature detection unit In the peak shift control for calculating the boiling start time so as to boil, if there is a track record of performing the heating operation within a predetermined period in the past, a hot water storage type water heater that advances the boiling start time. 6. The boiling start time of peak shift control is advanced when there is a track record of performing a heating operation within a predetermined period in the past and when there is a track record of performing the heating operation in a midnight time zone. Hot water storage water heater. A tank for storing hot water, a heat source for boiling the hot water in the tank, a remaining hot water temperature detecting unit for detecting the amount of remaining hot water in the tank, a feed water temperature detecting unit for detecting the feed water temperature to the tank, A heating system unit that performs a heating operation using hot water in the tank, and an operation unit that performs a reserved operation of the heating system unit, a remaining hot water amount by the remaining hot water temperature detection unit, and a water supply by the feed water temperature detection unit In the peak shift control that calculates the boiling start time so that the entire amount of the tank is boiled at the end time of the midnight time zone depending on the temperature, the setting for starting the heating operation during the midnight time zone is performed by the reserved operation of the operation unit. Hot water storage type water heater that advances the boiling start time when A tank for storing hot water, a heat source for boiling the hot water in the tank, a remaining hot water temperature detecting unit for detecting the amount of remaining hot water in the tank, a feed water temperature detecting unit for detecting the feed water temperature to the tank, A heating system unit that performs heating operation using the hot water in the tank, and the total amount of the tank at the end time of the midnight time zone according to the remaining hot water amount by the remaining hot water temperature detection unit and the feed water temperature by the feed water temperature detection unit In the peak shift control that calculates the boiling start time so that the water will boil, if heating operation is performed during the peak shift until the boiling start time is reached, the peak shift is canceled and the tank is fully heated. Hot water storage water heater.

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