JP3987014B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that uses hot water stored in a hot water storage tank to replenish hot water in a bathtub.

Conventionally, in this type of electric water heater and heat pump hot water storage type hot water supply device, if there is a reheating command, the temperature of the hot water stored in the hot water storage tank is detected, and if this temperature is higher than the predetermined temperature, the reheating operation is performed. If the temperature is lower than the predetermined temperature, the reheating operation is not performed, and hot water in the hot water storage tank is poured into the bathtub.
JP 2003-50048 A

  However, in this conventional system, after the reheating operation is started, the reheating is continued if the hot water storage temperature of the hot water storage tank is equal to or higher than a predetermined temperature. Therefore, the temperature of the bath water is high and the hot water storage temperature of the hot water storage tank. Even when the efficiency of heat exchange is poor, such as when the difference is small, if the hot water storage temperature is higher than the predetermined temperature, it will continue to reheat, and it takes a long time to raise the bath water to the temperature desired by the user, The chasing operation will continue forever, impairing the user's convenience, and the temperature of the hot water will be reduced by exchanging heat with the bathtub water, and there will be more hot water that cannot be used as a heat source for reheating and is also difficult to use for hot water supply. As a result, there is a problem that efficiency is lowered.

Therefore, in order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, a bath circulation circuit for circulating hot water in a bathtub, and a bath water provided in the bath circulation circuit in the hot water storage tank. A heat exchanger that heats up with the stored hot water, a bath temperature sensor that detects the temperature of the bath water flowing into the heat exchanger, and circulates the bath water to the heat exchanger to perform a reheating operation. When the hot water storage temperature detected by the hot water storage temperature sensor attached to the hot water storage tank is higher than the specified temperature, the reheating operation is started and the temperature detected by the return temperature sensor does not increase during the reheating operation. In this way, the chasing operation is stopped.

Further, in claim 2, a hot water storage tank for storing hot water, a hot water storage temperature sensor for detecting a hot water storage temperature of the hot water storage tank, a bath circulation circuit for circulating hot water in the bathtub, and bath water provided in the bath circulation circuit. A heat exchanger that heats with hot water stored in a hot water storage tank, a bath temperature sensor that detects the temperature of the bath water flowing into the heat exchanger, and a reheating operation by circulating the bath water to the heat exchanger. In the above-described configuration, the hot water storage temperature detected by the hot water storage temperature sensor attached to the hot water storage tank starts the reheating operation when the hot water temperature is higher than a predetermined temperature, and the temperature detected by the hot water storage temperature sensor during the reheating operation and the temperature When the temperature difference detected by the return temperature sensor is equal to or less than a predetermined value, the chasing operation is stopped.

Further, in claim 3, a hot water storage tank for storing hot water, a bath circulation circuit for circulating hot water in the bathtub, and a heat exchanger provided in the middle of the bath circulation circuit for heating the bathtub water with the hot water stored in the hot water storage tank A bath return temperature sensor for detecting the temperature of the bath water flowing into the heat exchanger, a bath temperature sensor for detecting the temperature of the bath water flowing out of the heat exchanger, and the bath water to the heat exchanger. When the recirculation operation is performed in a circulating manner, the reheating operation is started when the hot water storage temperature detected by a hot water storage temperature sensor attached to the hot water storage tank is higher than a predetermined temperature , and the reversion is performed during the reheating operation. When the difference between the temperature detected by the temperature sensor and the temperature detected by the forward temperature sensor is equal to or less than a predetermined value, the chasing operation is stopped.

  According to a fourth aspect of the present invention, the hot water storage type hot water supply apparatus according to any one of the first to third aspects includes a hot water filling pipe for pouring hot water in the hot water storage tank into the bathtub through the bath circulation circuit, and performs a reheating operation. After stopping, the hot water operation to supply hot water to the bathtub through the hot water tube is performed to raise the temperature of the bathtub water.

According to the first aspect of the present invention, after checking the start of the reheating operation by the amount of heat of the hot water storage tank, the temperature detected by the return temperature sensor is monitored, and when the reheating operation is actually started, the reheating operation is almost completed. It is possible to detect a situation where it is not possible or it takes a very long time to complete the chasing, and in that case, chasing the driving can be stopped.

Further, according to claim 2, after checking the start of the reheating operation by the amount of heat of the hot water storage tank, the temperature detected by the hot water storage temperature sensor and the temperature detected by the backflow temperature sensor are monitored to actually follow up. It is possible to detect a situation in which it is hardly possible to reheat when starting a fired operation, or it takes a very long time to complete reheating due to a decrease in hot water temperature due to reheating or a decrease in the amount of stored hot water due to the use of hot water. You can stop driving in case.

According to the third aspect of the present invention, after the reheating operation start check based on the amount of heat in the hot water storage tank is performed, the temperature detected by the bath return temperature sensor and the temperature detected by the bath temperature sensor are actually monitored. It is possible to detect a situation in which it is almost impossible to reheat when starting a reheating operation, or it takes a very long time to complete reheating due to a decrease in hot water temperature due to reheating or a decrease in the amount of stored heat due to the use of hot water, In that case, the chasing operation can be stopped.

  According to the fourth aspect of the present invention, since the hot water supply operation is automatically performed after the reheating operation is stopped, even if the efficiency of the reheating operation is likely to be long and it takes a long time, The water temperature can be raised.

  Next, an embodiment of the present invention will be described with reference to the drawings.

  This hot water storage type hot water supply device boils and stores hot water in the midnight hours when the unit price of contracted power by time is low, and uses the hot water stored for hot water supply. 1 is a hot water storage tank 2 for storing hot water. 3 is a heat pump unit as a heating means for heating hot water in the hot water storage tank, 4 is a hot water tap provided in a kitchen or a washroom, etc. 5 is a remote control for remotely operating the hot water storage type hot water supply device , 6 is a bathtub.

  The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 7 connected to the upper end, a water supply pipe 8 connected to the lower end, a heat pump forward pipe 9 constituting a heat pump circulation circuit in the lower part, and a heat pump circulation circuit in the upper part. The heat pump return pipe 10 is connected, the hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 9 is boiled by the heat pump unit 3 and returned to the hot water storage tank 2 from the heat pump return pipe 10 to be stored in the hot water supply pipe. The hot water in the hot water storage tank 2 is pushed up by the water supply from 8, and the hot water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 7 to supply hot water.

  The heat pump unit 3 includes a compressor 11, a refrigerant-water heat exchanger 12 as a condenser, an electronic expansion valve 13, a forced air-cooled evaporator 14, and hot water in the hot water storage tank 2. A heat pump circulation pump 16 that circulates to the refrigerant-water heat exchanger 12 through the heat pump forward pipe 9 and the heat pump return pipe 10 and a heat pump control unit 17 that controls driving thereof are provided in the heat pump circuit 15. Is one in which carbon dioxide is used as a refrigerant to constitute a supercritical heat pump cycle. Since carbon dioxide is used as the refrigerant, low-temperature water can be boiled up to a high temperature of about 90 ° C. without an electric heater.

  Here, the refrigerant-water heat exchanger 12 employs a counter flow system in which the refrigerant and hot water in the hot water storage tank 2 that is heated water are opposed to each other. In the supercritical heat pump cycle, the refrigerant is exchanged during heat exchange. Since it is condensed in the supercritical state, the heated water can be efficiently heated to a high temperature so that the temperature difference between the refrigerant-water heat exchanger 12 inlet temperature and the refrigerant outlet temperature is constant. Further, by controlling the electronic expansion valve 12 or the compressor 11, the water to be heated can be heated in a state where the COP (energy consumption efficiency) is very good.

  Next, 18 is a heat exchanger made of a stainless steel serpentine tube for heating the hot water in the bathtub 6, and is arranged at the upper part in the hot water storage tank 2. A bath circulation circuit 22 comprising a bath return pipe 21 provided with a bath circulation pump 20 is connected so that hot water in the bathtub 6 can be circulated, and the hot water in the bathtub 6 is heated by the high-temperature water in the hot water storage tank 2 for heat insulation. Or it is something that is chased.

  23 is a bath return temperature sensor that detects the temperature of the bath water flowing into the heat exchanger 18 through the bath return pipe 21, and 24 is a bath that flows out of the heat exchanger 18 and flows into the bath 6 through the bath pipe 19. A temperature sensor that detects the temperature of water.

  Next, 25 is a hot water mixing valve composed of an electric mixing valve that mixes hot water from the hot water discharge pipe 7 and low temperature water from the water supply bypass pipe 26 branched from the water supply pipe 9. The mixing ratio is controlled so that the hot water temperature detected by the provided hot water temperature sensor 28 becomes the hot water supply set temperature set by the user using the remote controller 5.

  Reference numeral 29 denotes a hot water filling pipe branched from the hot water supply pipe 27 and communicated with the bath return pipe 21. The hot water filling pipe 29 includes a hot water filling valve 30 for starting / stopping hot water filling to the bathtub 6, and a bathtub 6. A bath flow counter 31 that counts the amount of hot water filling and a check valve 32 that prevents the bath water from flowing back to the hot water supply pipe 27 are provided.

  Next, a plurality of hot water storage temperature sensors 33 are arranged in the vertical direction of the hot water storage tank 2, and in this embodiment, five hot water storage temperature sensors are arranged and are called 33a, 33b, 33c, 33d, 33e from the top. The amount of heat remaining in the hot water storage tank 2 is detected based on the temperature information detected by the temperature sensor 33, and the vertical temperature distribution in the hot water storage tank 2 is detected.

  The remote controller 5 is provided with a hot water supply temperature setting switch 34 for setting the hot water supply set temperature and a bath temperature setting switch 35 for setting the bath set temperature. An automatic bath switch 36 that fills the hot water by an amount of hot water set by a hot water filling amount setting switch (not shown) and keeps it warm for a predetermined time, and a reheating switch 37 that replenishes the bath water are provided.

  A hot water supply control unit 38 includes a microcomputer that receives the input of each sensor in the hot water storage tank unit 1 and controls driving of each actuator, and constitutes a control unit. The remote controller 5 is connected to the hot water supply control unit 38 by wireless or wired so that the user can set an arbitrary hot water set temperature and bath set temperature.

  Note that 39 is an overpressure relief valve for releasing the overpressure of the hot water storage tank 2, 40 is a pressure reducing valve for reducing the pressure of the water supply, 41 is a hot water supply flow rate counter for counting the amount of hot water to be supplied, and 42 is for detecting the temperature of the water supply. It is a feed water temperature sensor.

Next, the operation of the first embodiment will be described.
First, when the hot water storage temperature sensor 39 detects that the necessary amount of heat does not remain in the hot water storage tank 2 in the midnight power time zone, the hot water supply control unit 38 issues a boiling start command to the heat pump control unit 17. To emit. Upon receiving the command, the heat pump control unit 17 starts driving the heat pump after starting the compressor 11, and cools the low temperature water of about 5 to 20 ° C. taken out from the heat pump forward pipe 9 connected to the lower part of the hot water storage tank 2 as a refrigerant. -Heated to a high temperature of about 70 to 90 ° C by the water heat exchanger 12, returned to the hot water storage tank 2 from the heat pump return pipe 10 connected to the upper part of the hot water storage tank 2, and sequentially stacked from the upper part of the hot water storage tank 2 Store hot water. When the hot water storage temperature sensor 33 detects that the necessary amount of heat has been stored, the hot water supply control unit 38 issues a boiling stop command to the heat pump control unit 17, and the heat pump control unit 17 stops the compressor 11 and heat pump circulation. The pump 16 is also stopped to end the boiling operation.

  Next, the hot water supply operation will be described. When the hot water tap 4 is opened, the water supplied from the water supply pipe 8 flows into the hot water storage tank 2. Then, the hot water stored in the hot water storage tank 2 flows into the hot water supply mixing valve 25 through the hot water discharge pipe 7 and is mixed with the low temperature water from the hot water supply bypass pipe 26, and the hot water control section 38 sets the mixing ratio of the hot water supply mixing valve 28. The adjusted hot water at the hot water supply set temperature is supplied from the hot water tap 4. Then, the hot water supply is completed by closing the hot water tap 4.

  Next, the hot water filling operation to the bathtub 6 will be described. When the automatic bath switch 36 of the remote controller 5 is operated, the hot water supply control unit 38 opens the hot water filling valve 30. Then, the hot water adjusted to the set temperature by the hot water supply mixing valve 28 is poured from the hot water filling pipe 29 to the bathtub 6 through the hot water return pipe 21, and a bath flow rate counter 31 provided in the middle of the hot water filling pipe 29 is predetermined. When the amount of hot water filling is counted, the hot water supply control unit 38 closes the hot water filling valve 30 and ends the hot water filling operation.

  Next, the warming operation or reheating operation of the bath will be described. When the reheating switch 37 of the remote controller 5 is turned on, the start condition of the reheating operation is checked, and the hot water supply control unit 38 is attached to the hot water storage tank 2. The hot water storage temperature detected by the hot water storage temperature sensor 33 is checked, and if it is equal to or higher than a predetermined amount of heat or a predetermined temperature, the start-up operation is started because the start condition is satisfied.

  This reheating operation will be described based on the flowchart shown in FIG. 2. When the reheating operation is started, in step 1 (hereinafter abbreviated as S1), the hot water supply control unit 38 starts driving the bath circulation pump 20 and supplies the bath water. The hot water temperature in the bathtub 6 flows into the heat exchanger 19 and heat is exchanged between the hot water stored in the upper portion of the hot water storage tank 2 and the bathtub water, so that the warming operation or reheating operation of the bath is performed. At that time, the temperature detected by the bath return temperature sensor 23 is stored as the bath initial temperature (S2).

  When a predetermined time has elapsed since the start of the chasing operation (S3), the bath water temperature is detected by the bath return temperature sensor 23, and the bath water temperature is higher than the bath bath initial temperature stored in S2. If so (Yes in S4), the chasing operation is continued until the temperature of the bath water reaches the target chasing temperature (S5).

  When the temperature detected by the bath return temperature sensor 23 reaches the bath set temperature, the hot water supply control unit 38 stops driving the bath circulating pump 20 (S6) and ends the reheating operation (S7).

  Here, the temperature of the bath water returned from the bathtub 6 to the heat exchanger 18 detected by the bath return temperature sensor 23 after the elapse of a predetermined time from the start of the chasing operation is a predetermined temperature (for example, 1 ° C.) from the bath initial temperature. ) If it has not risen above (No in S4), the chasing operation is stopped. And the hot water control part 38 raises the hot water temperature in the bathtub 6 by performing the hot water operation which supplies hot water to the bathtub 6 (S8).

  In the hot water operation, the hot water supply control unit 38 opens the hot water filling valve 30, and hot water adjusted to a hot hot water temperature (here, 60 ° C.) by the hot water supply mixing valve 28 is poured from the hot water filling pipe 29. The hot water supply control unit 38 closes the hot water filling valve 30 and performs hot water supply operation when the hot water flow counter 31 provided in the hot water filling pipe 29 counts a predetermined amount of hot water. It ends.

  In this way, even if the start condition of the reheating operation is satisfied, when the reheating operation is actually started, for example, when the bath temperature is high and the temperature difference with the hot water storage temperature is small, the reheating operation can hardly be repelled. Alternatively, it is possible to detect a situation in which it takes a very long time to complete the chasing, and in that case, the chasing operation can be stopped.

  Therefore, the reheating operation will continue forever, and the hot water storage temperature will be reduced to a wasteful temperature, and it will not be used as a heat source for reheating, and there will be no increase in hot water storage that is difficult to use for hot water supply. It can be used without wasting the hot water in the tank.

  Also, since the hot water operation is automatically performed after stopping the reheating operation, even if the efficiency of the reheating operation is low and it seems that it takes time, the hot water can quickly raise the temperature of the bath water. it can.

  Next, a second embodiment of the present invention will be described. The description of the same configuration as that of the first embodiment will be omitted, and the reheating operation will be described based on the flowchart shown in FIG.

  When the reheating switch 37 of the remote controller 5 is turned on, the start condition of the reheating operation is checked, and the hot water supply control unit 38 checks the hot water storage temperature detected by the hot water storage temperature sensor 33 attached to the hot water storage tank 2. If the amount of heat is equal to or higher than the predetermined temperature, the start-up operation is started because the start condition is satisfied.

  When the reheating operation is started, in S11, the hot water supply control unit 38 starts driving the bath circulation pump 20 to circulate the bath water, causing the hot water temperature in the bath 6 to flow into the heat exchanger 19 and the upper portion in the hot water storage tank 2. The hot water stored in the bath and the bathtub water are heat-exchanged, and the bath is kept warm or operated.

  When a predetermined time elapses after the start of the reheating operation and the reheating operation becomes stable (S12), the hot water storage temperature in the vicinity of the heat exchanger detected by the hot water storage temperature sensor 33 and the temperature detected by the bath return temperature sensor 23 are changed. The difference is equal to or larger than the predetermined value, and it is determined that the bath water can be efficiently heated (Yes in S13), and the reheating operation is continued until the temperature of the bath water reaches the target reheating temperature (S14). ).

  When the temperature detected by the bath return temperature sensor 23 reaches the reheating target temperature, the hot water supply control unit 38 stops driving the bath circulating pump 20 (S15) and ends the reheating operation (S16). .

  Here, the difference between the hot water storage temperature in the vicinity of the heat exchanger detected by the hot water storage temperature sensor 33 during the reheating operation and the temperature detected by the return temperature sensor 23 is equal to or less than a predetermined value, and the bath water is efficiently heated. Is determined to be difficult (No in S13), the chasing operation is stopped. And the hot water control part 38 raises the hot water temperature in the bathtub 6 by performing the hot water operation which supplies hot water to the bathtub 6 (S17).

  In this way, even if the start condition of the reheating operation is satisfied, when the reheating operation is actually started, for example, when the bath temperature is high and the temperature difference with the hot water storage temperature is small, the reheating operation can hardly be repelled. Alternatively, it is possible to detect a situation in which it takes a very long time to complete reheating due to a decrease in hot water temperature due to reheating or a decrease in the amount of stored hot water due to the use of hot water supply. In this case, reheating operation can be stopped.

  Therefore, the reheating operation will continue forever, and the hot water storage temperature will be reduced to a wasteful temperature, and it will not be used as a heat source for reheating, and there will be no increase in hot water storage that is difficult to use for hot water supply. It can be used without wasting the hot water in the tank.

  Also, since the hot water operation is automatically performed after stopping the reheating operation, even if the efficiency of the reheating operation is low and it seems that it takes time, the hot water can quickly raise the temperature of the bath water. it can.

  Next, Embodiment 3 of the present invention will be described. Note that the description of the same configuration as in the first or second embodiment is omitted, and the chasing operation is described based on the flowchart shown in FIG.

  When the reheating switch 37 of the remote controller 5 is turned on, the start condition of the reheating operation is checked, and the hot water supply control unit 38 checks the hot water storage temperature detected by the hot water storage temperature sensor 33 attached to the hot water storage tank 2. If the amount of heat is equal to or higher than the predetermined temperature, the start-up operation is started because the start condition is satisfied.

  When the reheating operation is started, the hot water supply control unit 38 starts driving the bath circulation pump 20 to circulate the bath water in S21, and causes the hot water temperature in the bathtub 6 to flow into the heat exchanger 19, and the upper portion in the hot water storage tank 2 is started. The hot water stored in the bath and the bathtub water are heat-exchanged, and the bath is kept warm or operated.

  When a predetermined time elapses after the start of the chasing operation and the chasing operation is stabilized (S22), the difference between the temperature detected by the leading temperature sensor 24 and the temperature detected by the trailing temperature sensor 23 is a predetermined value or more. Thus, it is determined that the bath water is efficiently heated (Yes in S23), and the reheating operation is continued until the temperature of the bath water reaches the target reheating temperature (S24).

  When the temperature detected by the bath return temperature sensor 23 reaches the reheating target temperature, the hot water supply control unit 38 stops driving the bath circulating pump 20 (S25) and ends the reheating operation (S26). .

  Here, the difference between the temperature detected by the forward temperature sensor 24 and the temperature detected by the return temperature sensor 23 during the reheating operation is less than a predetermined value, and it is determined that the bath water is not efficiently heated. Then (No in S23), the chasing operation is stopped. And the hot-water supply control part 38 raises the hot water temperature in the bathtub 6 by performing the hot-water supply operation which supplies hot water to the bathtub 6 (S27).

  In this way, even if the start condition of the reheating operation is satisfied, when the reheating operation is actually started, for example, when the bath temperature is high and the temperature difference with the hot water storage temperature is small, the reheating operation can hardly be repelled. Alternatively, it is possible to detect a situation in which it takes a very long time to complete reheating due to a decrease in hot water temperature due to reheating or a decrease in the amount of stored hot water due to the use of hot water supply. In this case, reheating operation can be stopped.

  Therefore, the reheating operation will continue forever, and the hot water storage temperature will be reduced to a wasteful temperature, and it will not be used as a heat source for reheating, and there will be no increase in hot water storage that is difficult to use for hot water supply. It can be used without wasting the hot water in the tank.

  Also, since the hot water operation is automatically performed after stopping the reheating operation, even if the efficiency of the reheating operation is low and it seems that it takes time, the hot water can quickly raise the temperature of the bath water. it can.

  In Examples 1 to 3, the hot water operation is automatically performed when the reheating operation is stopped. However, the present invention is not limited to this. For example, the water level of the bathtub is detected, and the hot water operation is performed according to the bathtub water level. It may be determined whether or not to perform, and the amount of hot water may be changed according to the bathtub water level. In addition, when performing the hot water supply operation automatically, it is better to notify the remote control 5 by voice or text that the hot water supply operation is started.

  Further, in Examples 1 to 3, after the chasing operation is stopped, the hot water driving operation is not performed, and the remote controller 5 notifies the remote controller 5 by voice or text that the chasing is stopped due to insufficient heat amount or a decrease in heat exchange efficiency. It may be. In that case, it is even better to notify by voice or text that hot water operation is recommended.

  In the first to third embodiments, the start condition of the reheating operation is determined based on the temperature detected by the hot water storage temperature sensor 33b close to the heat exchanger 18, but the detection temperature of the hot water storage temperature sensor 33a is taken in or The amount of heat of the entire tank 2 may be taken into judgment.

  Moreover, in Examples 1-3, although the heat exchanger 18 was arrange | positioned in the hot water storage tank 2, not only this but the heat exchanger 18 is arrange | positioned out of the hot water storage tank 2, and hot water storage hot water is circulated to the heat exchanger 18. It is also good as a method of making it. Further, the heat pump type is adopted as means for heating the hot water storage, but the present invention is not limited to this, and an electric heater may be disposed in the hot water storage tank 2.

The schematic block diagram of the hot water storage type hot-water supply apparatus of Examples 1-3 of this invention. FIG. 3 is a flowchart for explaining a chasing operation according to the first embodiment. FIG. 9 is a flowchart for explaining a chasing operation according to the second embodiment. 9 is a flowchart for explaining a chasing operation according to the third embodiment.

Explanation of symbols

2 Hot water storage tank 6 Bath 18 Heat exchanger 22 Bath circulation circuit 23 Bath return temperature sensor 24 Bath temperature sensor 29 Hot water pipe 33 Hot water storage temperature sensor

Claims (4)

A hot water storage tank that stores hot water, a bath circulation circuit that circulates hot water in the bathtub, a heat exchanger that is provided in the middle of the bath circulation circuit and that heats the bathtub water with the hot water stored in the hot water storage tank, and the heat exchanger A bath temperature sensor that detects the temperature of the inflowing bath water and a hot water temperature sensor that is attached to the hot water storage tank detects the temperature of the bath water that circulates through the heat exchanger and causes the reheating operation. The hot water storage type is characterized in that the reheating operation is started when the hot water storage temperature is not less than a predetermined temperature and the temperature detected by the return temperature sensor does not rise during the reheating operation. Hot water supply device. A hot water storage tank for storing hot water, a hot water storage temperature sensor for detecting the hot water temperature of the hot water storage tank, a bath circulation circuit for circulating hot water in the bathtub, and hot water stored in the hot water storage tank provided in the bath circulation circuit A heat exchanger that heats the heat exchanger, a bath temperature sensor that detects the temperature of the bath water flowing into the heat exchanger, and a bath water that circulates in the heat exchanger to perform a reheating operation. The hot water storage temperature detected by the hot water storage temperature sensor attached to the hot water storage tank starts a reheating operation when the temperature is equal to or higher than a predetermined temperature, and the temperature detected by the hot water storage temperature sensor during the reheating operation is detected by the backflow temperature sensor. A hot water storage type hot water supply apparatus characterized in that when the temperature difference is equal to or less than a predetermined value, the reheating operation is stopped. To the hot water storage tank that stores hot water, the bath circulation circuit that circulates the hot water in the bathtub, the heat exchanger that is provided in the middle of the bath circulation circuit and that heats the bathtub water with the hot water stored in the hot water storage tank, and this heat exchanger A bath temperature sensor for detecting the temperature of the bath water flowing in, a bath temperature sensor for detecting the temperature of the bath water flowing out of the heat exchanger, and a reheating operation by circulating the bath water to the heat exchanger. The temperature of the hot water storage sensor detected by the hot water storage temperature sensor attached to the hot water storage tank starts the reheating operation when the temperature is equal to or higher than a predetermined temperature, and the temperature detected by the return temperature sensor during the reheating operation is The hot water storage type hot water supply apparatus is characterized in that when the temperature difference detected by the furrow temperature sensor is equal to or less than a predetermined value, the reheating operation is stopped.   The hot water storage type hot water supply apparatus includes a hot water filling pipe for pouring hot water in the hot water storage tank into the bathtub through the bath circulation circuit, and hot water is bathed through the hot water filling pipe after stopping the reheating operation. The hot water storage type hot water supply apparatus according to claim 1, wherein the temperature of the bath water is increased by performing a hot water supply operation to supply to the hot water.

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