JP3850850B2 - Hot water storage water heater - Google Patents

Description

  The present invention operates a feed water heating device such as a heat pump unit with inexpensive late-night power, etc., heats the feed water until the target heat storage amount commanded by the control device is reached, and stores hot water in a hot water storage tank. The present invention relates to a hot water storage type hot water supply device that can perform. In particular, the present invention relates to a hot water storage type hot water supply apparatus in which hot water in a hot water storage tank is circulated outside the hot water storage tank and used as a heat source for a heating apparatus, and at the same time hot water can be used from a hot water outlet.

  A conventional hot water storage type hot water supply device operates hot water supply heating devices such as a heat pump unit by using inexpensive late-night electric power and accumulates hot water. The hot water storage type hot water supply apparatus heats the water supply in the hot water storage tank by a water supply heater. The heated hot water is stored in the uppermost part of the hot water storage tank due to the difference in specific gravity of water, which is a temperature difference, and is not mixed with the water in the lower part of the hot water storage tank.

  The hot water stored in the uppermost part of the hot water storage type hot water supply device is utilized by opening a faucet or the like that communicates with a hot water supply pipe connected to the uppermost part of the hot water storage tank. In addition, the used amount of water is supplied to the hot water storage tank from a water supply pipe connected to the lowermost part. The feed water heating device is devised so as not to use as much as possible an expensive electricity charge during the daytime hours, for example, using midnight electricity during the midnight hours (23:00 to 7:00 in the morning of the following day) where the electricity rate is low. ing.

  In general, the hot water storage type hot water supply device also functions as a heat source of the heating device. For example, the hot water storage type hot water supply device is used as a heat source of the heating device by circulating hot water in the hot water storage tank to the heating device outside the hot water storage tank. The capacity of the heat source in the hot water storage tank is reduced by the amount used for the heating device. Therefore, while using the heating apparatus, the feed water heating apparatus is controlled so as to set the heating temperature to the maximum temperature that can be set and to operate at the maximum capacity.

Furthermore, the conventional hot water storage type hot water supply device accumulates the heating usage time in a certain period, judges the presence or absence of usage history over a certain period of time, and if there is a usage history, heating by the feed water heating device than when there is no performance record The temperature is set high and the heat storage amount in the hot water storage tank is estimated to be small so that more hot water can be stored in the hot water storage tank. The hot water storage type hot water supply apparatus is described in, for example, Japanese Patent Application Laid-Open No. 2003-227658.
JP 2003-227658 A

  However, since the conventional hot water storage type hot water supply device uses the hot water stored in the hot water storage tank as a heat source for the heating device, the amount of heat stored in the hot water storage tank is small when the hot water is discharged for a long time or after bathing and hot water operation. When heating operation is performed during the daytime, there is a problem that hot water having a sufficient temperature as a heat source is insufficient. The hot water storage type hot water supply apparatus operates with the maximum capacity so as to increase the temperature of the hot water in the hot water storage tank, but cannot immediately increase the temperature of the hot water in the hot water storage tank.

  When the temperature of the hot water in the hot water storage tank does not reach the set temperature, the conventional hot water storage type hot water supply device automatically sets the standby state of the heating operation and notifies the user of the fact by the display device. Yes. However, the hot water storage type hot water supply device has the inconvenience that not only the heating device cannot be used in the standby state but also the temperature is not sufficient for bath water and hot water supply.

  In order to solve the above-mentioned problems, the present invention eliminates the inconvenience of stopping the heating operation due to the heat source in the hot water storage tank being insufficient in the amount of stored heat regardless of the usage conditions at any time. An object of the present invention is to provide a hot water storage type hot water supply device having a function to obtain. An object of this invention is to provide the hot water storage type hot water supply apparatus which can obtain the hot water of required temperature under any use condition in any time slot | zone.

(First invention)
The hot water storage type hot water supply apparatus according to the first aspect of the present invention can use a heat source of a hot water storage tank boiled and stored by a water supply heating device for heating and hot water supply, and the water supply heating device for heating the supplied water supply, A hot water storage tank in which hot water heated by the hot water supply heater is stored, a hot water outlet using the hot water in the hot water storage tank, a heating device for circulating a heat source stored in the hot water storage tank, and heating by the water supply heating device A first three-way valve that can supply the hot water to the hot water storage tank and the heating device; a second three-way valve that supplies hot water in the hot water supply device or the hot water storage tank to a desired hot water temperature; and controls the feed water heating in the feed water heater, the case where the temperature of the hot water storage tank is equal to or less than the set temperature, supplies the hot water heated in the water supply heating device to the heating system, feed Command allows to close the supply of hot water to the heating system, characterized in that it comprises at least a control device for controlling the first three-way valve to emit the hot water from the tap hole.

( Second invention)
The hot water storage type hot water supply apparatus of the second invention is characterized in that the three-way valve of the first invention is controlled by the difference between the heat storage amount in the hot water storage tank and the heat amount of hot water used from the hot water outlet.

( Third invention)
Hot water storage type hot water supply device of the third invention, the kind of temperature the heating system of the hot water to be supplied to the heating device from the three-way valve of the first or second aspect, characterized in that it is controlled.

  According to the present invention, even when a situation in which hot water is insufficient in the hot water storage tank occurs during operation of the heating device, the hot water heated by the feed water heating device is directly used as a heat source for the heating device. Therefore, the standby state of the heating device is eliminated, and inconvenience for the user can be solved.

  According to the present invention, immediately after using a large amount of hot water, even when the temperature of the hot water in the hot water storage tank is low, the hot water heated from the water heater is directly supplied to the heating device via the three-way valve. Therefore, it does not feel cold until the hot water temperature in the hot water storage tank rises.

  According to the present invention, while hot water is being discharged from the hot water outlet, the hot water is temporarily stopped to be sent to the heating device and priority is given to the hot water of the hot water outlet. Hot water at a desired temperature can be used.

  According to the present invention, whether or not the hot water heated by the feed water heating device is used as a heat source of the heating device, the type of the heating device used, the temperature of the hot water in the hot water storage tank, the amount of heat, the use of hot water, a bath, etc. By determining according to the situation, it is possible to perform control suitable for the purpose of the user.

  According to the present invention, the hot water heated from the feed water heating device can be appropriately used as the hot water from the heating device and the hot water outlet by controlling the opening / closing angle or opening / closing angle of the three-way valve.

  According to the present invention, the amount of heat stored in the hot water storage tank and the amount of heat of the hot water are always calculated, and even when the hot water is started, the opening / closing angle of the three-way valve is controlled by the difference in the amount of heat, It is possible to supply hot water at a temperature convenient for both the heating device and the hot water.

(First invention)
In the hot water storage type hot water supply apparatus of the first invention, the heat source of the hot water storage tank that is stored by boiling the water supply by the water supply heating apparatus can be used for heating and hot water supply. For example, tap water is supplied to the feed water heating device and heated to a predetermined temperature. The said feed water heating apparatus is a heat pump unit, for example, and is improving thermal efficiency by using a refrigerant | coolant. The hot water storage tank stores hot water heated by the feed water heating device, and cold water is supplied from the lower portion by the amount of hot water used. The stored hot water in the hot water storage tank is used for bathrooms (for example, for hot water filling or showering), for bathrooms, for cooking, etc. by taking out from the hot water outlet.

  The heat source stored in the hot water storage tank is used by circulating the unit of the heating device. The three-way valve can appropriately supply hot water heated by the feed water heating device to the hot water storage tank and the heating device by opening and closing or adjusting the angle. The control device controls heating of the feed water in the feed water heating device based on information from sensors in the hot water storage tank and the like, and controls the three-way valve when the temperature in the hot water storage tank is lower than a set temperature. Then, the hot water heated in the feed water heating device is controlled to be supplied to the heating device.

  The hot water storage type hot water supply apparatus according to the first aspect of the present invention is a method in which the hot water heated from the hot water supply heating device is directly heated via the three-way valve even when a large amount of hot water is used and the temperature of the hot water in the hot water storage tank is low. Since it is supplied to the device, it does not feel cold until the temperature of the hot water in the hot water storage tank rises.

In the hot water storage type hot water supply apparatus of the present invention, when the hot water in the hot water storage tank is lower than the set temperature, when the hot water is taken out from the hot water outlet, hot water having a temperature lower than the set temperature is discharged. In order to prevent low temperature hot water, the three-way valve is closed and controlled so as not to supply hot water to the heater side. The hot water storage type hot water supply apparatus of the present invention temporarily stops sending hot water to the heating device while giving hot water from the hot water outlet, and gives priority to hot water at the hot water outlet.

In the hot water storage type hot water supply apparatus of the present invention, the three-way valve is controlled by the set temperature of the hot water storage tank. That is, when the hot water in the hot water storage tank is higher than the set temperature, the three-way valve opens so as to be supplied from the hot water storage tank to the heating device, and when the hot water is lower than the set temperature, it is supplied from the feed water heating device. To do.

( Second invention)
In the hot water storage type hot water supply apparatus of the second invention, the three-way valve is controlled by the difference between the heat storage amount in the hot water storage tank and the heat amount of hot water used from the hot water outlet. The control device calculates the amount of heat in the hot water storage tank based on temperature information from each temperature sensor in the depth direction in the hot water storage tank. Similarly, the said control apparatus calculates the calorie | heat amount of the hot water used from a hot water outlet based on the temperature information and flow volume information of the hot water which comes out from a hot water outlet. In the hot water storage type hot water supply apparatus of the second invention, the control device does not simply open and close the three-way valve, but appropriately controls the opening angle of the three-way valve based on the difference in the amount of heat.

( Third invention)
In the hot water storage type hot water supply apparatus of the third aspect of the invention, the temperature of hot water supplied from the three-way valve to the heating device is controlled by the type of the heating device. The heating device includes, for example, floor heating, panel heater, bathroom heating, drying room, indoor heating, and the like, and hot water is supplied to a unit provided on the floor or wall surface.

  FIG. 1 is a block diagram for explaining an outline of a hot water storage type hot water supply apparatus according to a first embodiment of the present invention. In FIG. 1, a hot water storage type hot water supply apparatus includes a hot water storage tank 11, a water supply heating apparatus 21 including a heat pump unit, a three-way valve 13, a heat exchange unit 14 serving as a heating apparatus, and a water supply source 15 connected to water. And a hot water outlet 16 and a control device 31.

  The hot water storage tank 11 is a vertically long cylindrical body made of a metal having excellent corrosion resistance such as stainless steel. The hot water storage tank 11 is covered with a heat insulating material (not shown) on the outer peripheral portion so that hot water can be kept warm for a long time. The hot water storage tank 11 is connected to a water supply pipe 151 that can supply water from a water supply source 15 at the bottom. Further, a thermistor 152 capable of sending temperature information of the water supply to the control device 31 is disposed in the water supply pipe 151.

  Water supplied through the water supply pipe 151 is connected to the mixing valve 163 via a bypass pipe 153. The hot water in the uppermost part of the hot water storage tank 11 is added with water from the mixing valve 163 via the outlet pipe 165, so that hot water having a desired heat is obtained as a hot water outlet via the hot water piping 162 and the flow rate counter 164. 16 is derived. Further, the mixing valve 163 can adjust the opening / closing angle of the valve body by driving a servo motor (not shown) by a control signal from the control device 31 as necessary.

  The outlet side of the mixing valve 163 is connected to a hot water outlet 16 which is a faucet for a shower, bath, washroom, kitchen or the like. The temperature of hot water coming out of the hot water outlet 16 is controlled by sending temperature information of the thermistor 161 provided in the hot water piping 162 and flow rate information of the flow rate counter 164 to the control device 31.

  The hot water storage tank 11 is provided with a suction port 122 for sending water to the feed water heating device 21 in order to heat the water in the lowermost part. The water led out from the inlet 122 passes through the pipe 212 and enters the feed water heater 21, and after being heated, the hot water heated from the outlet 123 to the hot water storage tank 11 passes through the pipe 213. Supplied. The heated hot water supplied from the pipe 213 is supplied to the three-way valve 13. The suction port 122, the pipe 212, the feed water heater 21, the pipe 213, the discharge port 123, and the hot water storage tank 11 form a first circulation circuit.

  The feed water heater 21 is composed of a heat pump unit, for example, and uses a refrigerant such as carbon dioxide. The refrigerant is compressed and heated, and heats the water in the first circulation circuit via a built-in heat exchanger (not shown), and then returns to its original state by expansion and is used for circulation. The hot water storage tank 11 is provided with a hot water tank output temperature detection sensor (not shown) on the uppermost outer wall surface. Temperature information detected by the hot water tank output temperature detection sensor is sent to the control device 31.

  The three-way valve 13 provided in the upper part of the hot water storage tank 11 is configured so that hot water heated by the feed water heating device 21 is supplied from either the discharge port 123 or the suction port 124 from one of the second circulation circuits 131 described later. Connected to. When the three-way valve 13 is closed and the discharge port 123 is opened, heated hot water is supplied from the bypass pipe 153 to the hot water storage tank 11. When the three-way valve 13 is connected to the suction port 124 side, the hot water stored in the hot water storage tank 11 is supplied to a second circulation circuit 131 described later.

  The second circulation circuit 131 circulates the hot water in the order of the suction port 124 of the hot water storage tank 11, the three-way valve 13, the heat exchanger 141 of the heating device, the water pump 132, the discharge port 125, and the hot water storage tank 11. The heat exchanger 141 is, for example, a counter-flow type, and functions as a heating device by circulating the heat medium flowing through the third circulation circuit 143 through the water exchange unit 14 by the water pump 144. To have. The heat medium may be water.

  The second circulation circuit 131 sends the temperature information of the heat medium circulating through the heat exchanger 141 to the control device 31 by the thermistor 133. The third circulation circuit 143 sends temperature information of the heat medium passing through the heat exchange unit 14 to the control device 31 by the thermistor 142.

  The control device 31 includes hot water temperature information from each thermistor or flow rate information from the flow rate counter 164, air temperature information from an external air temperature detecting means (thermistor) 211 provided in the feed water heating device 21, and illustrated. The feed water heating device 21, the mixing valve 163, the water pumps 132 and 144, and the three-way valve 13 are controlled based on control information from the operation panel that is not installed. The operation panel (not shown) is installed in the vicinity of a place convenient for the user to use hot water, such as in a bathroom or kitchen. Moreover, the hot water storage tank 11 and the feed water heater 21 are installed in a suitable place outdoors.

  FIG. 2 is a flowchart for explaining the operation of the hot water storage type hot water supply apparatus according to the first embodiment of the present invention. In the hot water storage type hot water supply apparatus, a power switch (not shown) is turned on, and the operation of the heating apparatus is started (step 211). When the power is turned on, the control device 31 appropriately controls the water heating device 21 based on temperature information from each thermistor provided in the hot water storage tank 11 or time information set by an operation panel (not shown). Operate. The water heater 21 boils the water in the hot water storage tank 11 into hot water, for example, 90 ° C. hot water. The hot water storage type hot water supply device is controlled by the control device 31 so as to achieve low fuel consumption by using late-night power.

  When the heating device is turned on by an operation panel or reservation timer not shown, the control device 31 operates the water pumps 132 and 144 (step 212). The control device 31 checks whether or not the hot water temperature in the hot water storage tank 11 has reached a preset temperature (heat amount) by using the thermistor 111 in the hot water storage tank 11 (step 213).

  When the control device 31 determines that the hot water temperature in the hot water storage tank 11 is a sufficient temperature suitable for the heating device, the control device 31 drives the three-way valve 13 and fixes it to the inlet 124 side of the hot water storage tank 11. The hot water from the uppermost part in the hot water storage tank 11 is sucked into the second circulation circuit 131 from the suction port 124 and circulated as a heat medium in the second circulation circuit 131 (step 214).

  When the three-way valve 13 is fixed to the suction port 124 side, the hot water in the hot water storage tank 11 is circulated in the second circulation circuit 131 by the water pump 132. The hot water circulating in the second circulation circuit 131 is heat-exchanged by the heat exchanger 141. The energy exchanged by the heat exchanger 141 is transferred to the heat medium in the third circulation circuit 143. Based on the temperature information of the thermistor 111, the thermistor 133, and the thermistor 142, the control device 31 operates the water pumps 132, 144 so that the heat exchange in the heat exchanger 141 and the heat exchange unit 14 is favorably performed.

  When the heating operation is started, the control device 31 determines the temperature information of the thermistor 111 provided in the upper part of the hot water storage tank 11 and the flow rate information of the flow rate counter 164. Based on the temperature information of the thermistor 111, the control device 31 checks whether or not the temperature is the minimum required for heating operation. The minimum required hot water temperature is 60 degrees C for floor heating and 70 degrees C for bathroom drying.

  When the control device 31 determines in step 213 that the temperature information of the thermistor 111 is not the minimum required hot water temperature, the control device 31 operates the feed water heating device 21 for the heating operation, and sets the three-way valve 13. Hot water from the feed water heater 21 is supplied to the second circulation circuit 131 on the feed water heater 21 side (step 215) (step 216).

  Further, during the heating operation, the control device 31 checks whether or not it is a hot water other than heating based on information from the flow rate counter 164 (step 217). When it is determined that there is hot water, the control device 31 closes the feed water heating device 21 side of the three-way valve 13 in order to give priority to hot water (step 219). That is, the hot water heated by the feed water heater 21 once enters the hot water storage tank 11 from the discharge port 123 and flows from the uppermost part of the hot water storage tank 11 to the hot water outlet 16 side.

  The hot water in the hot water storage tank 11 is not necessarily at the minimum temperature required for heating, but since the time for flowing hot water from the hot water outlet 16 is often short, the temperature of the heating is temporarily reduced. When the control device 31 determines that the hot water is finished (step 220), the control device 31 opens the discharge port 123 side of the three-way valve 13 and controls the hot water of the feed water heating device 21 to flow to the heating device side. (Step 218).

  When the control device 31 determines that the temperature information of the thermistor 111 is equal to or higher than the minimum necessary temperature (step 213), since the hot water sufficient as a heat source is stored in the hot water storage tank 11, the flow counter 164 Whatever the state is, the three-way valve 13 is opened to the heating device side. Accordingly, the hot water in the hot water storage tank 11 passes through the three-way valve 13 and flows to the heating device side, and hot water is also discharged from the hot water outlet 16 at the same time.

  FIG. 3 is a block diagram for explaining a heating device and a control device for controlling hot water in a second embodiment of the present invention. In FIG. 3, the hot water storage tank 11 includes at least a hot water storage tank monitoring unit 311, a heating device monitoring unit 312, a water supply source monitoring unit 313, a hot water monitoring unit 314, a servo motor 320, and a three-way valve 321. Has been. The control device 31 includes at least an information storage unit 315, a calorific value difference calculation unit 316, a setting unit 317, a comparison determination unit 318, and a control unit 319.

  The hot water storage tank 11 has substantially the same configuration in the first embodiment. The hot water tank monitoring unit 311 sends the temperature information obtained by the thermistors 111 to 116 in FIG. 1 to the information storage unit 315 of the control device 31. The heating device monitoring unit 312 sends information such as the temperature of the heat medium in the second circulation circuit 131 and the third circulation circuit 143 to the information storage unit 315 by a thermistor provided in the heating device 322. The water supply source monitoring unit 313 sends temperature information of the thermistor 152 provided in the water supply pipe 151 that sends the water supply source entering the hot water storage tank 11 to the information storage unit 315. The hot water monitoring unit 314 sends temperature information of the thermistor 161 and flow rate information from the flow rate counter 164 to the information storage unit 315.

  For example, when the temperature in the hot water storage tank 11 is equal to or higher than the predetermined temperature and the hot water is being drawn from the hot water outlet 16, the control device 31 causes the hot water from the feed water heating device 323 to flow toward the heating device 322, and the hot water storage tank 11. The hot water in the inside is controlled to flow to the outlet 16. Further, the control device 31 calculates a heat amount difference between the heat storage amount in the hot water storage tank 11 and the heat amount used in the heating device 322 based on the information stored in the information storage unit 315. The calculation is performed by the unit 316.

  The control unit 319 compares the calculated heat difference with the temperature preset in the setting unit 317 by the comparison determination unit 318, and drives the servo motor 320 to widen the three-way valve 13 by a desired angle. Let Since the controller 31 constantly calculates the difference in the amount of heat between the hot water storage tank 11 and the hot water, the fixed position of the three-way valve 13 is maintained even when the hot water from the faucet, shower, bath, etc. is started. Can be controlled to change the desired angle.

  When the control device 31 determines that the amount of heat stored in the hot water storage tank 11 exceeds the amount of heat required for hot water filling, at least the hot water filling operation does not require supply of heated hot water to the hot water storage tank 11 by the feed water heating device 21. become.

  Next, the relationship among the feed water heating device (heat pump unit) 21, the heating device, the temperature or heat quantity in the hot water storage tank, the hot water, and the three-way valve 13 will be described. FIG. 4 is a view for explaining the relationship among the feed water heating device (heat pump unit), the heating device, the temperature or amount of heat in the hot water storage tank 11, the hot water, and the three-way valve in the embodiment of the present invention. In FIG. 4, when hot water is discharged from the hot water outlet 16, the temperature or heat quantity of the hot water in the hot water storage tank 11 is gradually increased because the heat pump unit 21 and the heating device are not operating. [Refer to Fig. 4 (3)].

  Next, since the temperature in the hot water storage tank 11 is equal to or lower than the set temperature, when the operation of the heat pump unit 21 and the heating device is started, the three-way valve 13 is opened on the heat pump unit 21 side [FIG. 4 (1), (See (2) and (5)). The heated hot water is supplied from the heat pump unit 21 to the heating device side to maintain the temperature of the hot water in the hot water storage tank 11 (see FIG. 4 (3)).

  It can be seen that when the temporary operation is interrupted, the hot water in the hot water storage tank 11 exceeds the set temperature (see FIGS. 4 (2) and 4 (3)). In addition, when the heating device resumes operation, the temperature of the hot water in the hot water storage tank 11 decreases (see FIG. 4 (3)). Next, when there is hot water during the heating operation, the heat pump unit 21 side of the three-way valve 13 is closed and the hot water in the upper part of the hot water storage tank 11 is supplied to the heating device, so the set temperature of the hot water in the hot water storage tank 11 is It decreases slightly (see FIGS. 4 (3), (4), (5)). When the heating operation is stopped, the set temperature of hot water in the hot water storage tank 11 rises (see FIGS. 4 (2) and 4 (3)).

  The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the matters described in the claims. Is possible. The three-way valve used in this example is a mixing valve that changes its opening area ratio depending on the temperature or amount of heat stored in the hot water storage tank, and the mixing ratio of hot water from the hot water heater and hot water in the upper part of the hot water tank. The mixed hot water can be used as a heat source for the heating device. The inside of the block in the figure is achieved by a known or well-known technique.

BRIEF DESCRIPTION OF THE DRAWINGS In 1st Example of this invention, it is a block diagram for demonstrating the outline of a hot water storage type hot-water supply apparatus. (Example 1) It is a flowchart for demonstrating operation | movement of the hot water storage type hot-water supply apparatus which is 1st Example of this invention. In 2nd Example of this invention, it is a block block diagram for demonstrating the control apparatus which controls a heating apparatus and a tapping water. (Example 2) It is a figure for demonstrating the relationship between the feed water heating apparatus (heat pump unit), the heating apparatus, the temperature or calorie | heat amount in a hot water storage tank, hot water, and a three-way valve in the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Hot water storage tank 111-116 ... Thermistor 121 ... Inlet port 122 ... Inlet port 123 ... Discharge port 124 ... Inlet port 125 ... Discharge port 13 ... Three-way valve 131 ... Second circulation circuit 132 ... Water pump 133 ... Thermistor 14 ... Heat exchange unit 141 ... Heat exchanger 142 ... Thermistor 143 ... Third circulation circuit 144 ... Water Pump 145 ... Piping 15 ... Water supply source 151 ... Water supply pipe 152 ... Thermistor 153 ... Bypass piping 16 ... Hot water outlet 161 ... Thermistor 162 ... Hot water piping 163 ... Mixing valve 164 ... Flow rate counter 165 ... Outlet pipe 21 ... Feed water heating device 211 ... Thermistor 212, 213 ... Piping 31 ... Control device

Claims (3)

In a hot water storage type hot water supply apparatus that can be used for heating and hot water supply, the heat source of a hot water storage tank that is stored by boiling the water supply with a water supply heating device,
A feed water heating device for heating the supplied feed water;
A hot water storage tank in which hot water heated by the feed water heating device is stored;
A tap that uses hot water in the hot water storage tank;
A heating device for circulating a heat source stored in the hot water storage tank;
A first three-way valve capable of supplying hot water heated by the feed water heating device to the hot water storage tank and the heating device;
A second three-way valve for supplying water to the hot water in the hot water heater or the hot water storage tank to obtain a desired hot water temperature;
While controlling the heating of the feed water in the feed water heating device, when the temperature in the hot water storage tank is lower than the set temperature, the hot water heated in the feed water heating device is supplied to the heating device, and by the hot water supply command, the heating device A control device for controlling the first three-way valve so as to close the supply of hot water to the hot water outlet and discharge hot water from the hot water outlet ;
A hot water storage type hot water supply apparatus characterized by comprising at least.   The hot water storage hot water supply apparatus according to claim 1, wherein the three-way valve is controlled by a difference between a heat storage amount in a hot water storage tank and a heat amount of hot water used from a hot water outlet. The hot water storage type hot water supply apparatus according to claim 1 or 2 , wherein the temperature of hot water supplied from the three-way valve to the heating device is controlled according to a type of the heating device.

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