JP2010019518A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve operation efficiency in hot water supply and heat storage by performing heat-retaining operation of a bathtub without breaking temperature stratification within a hot water storage tank. <P>SOLUTION: A water heater is provided with: a hot water supply circuit 6 having the hot water storage tank 1, a water supply pipe 2 and a hot water supply pipe 3; a heat storage circulation circuit 11 annularly interconnecting the hot water storage tank 1 and a heat source 7 by a going pipe 9 and a return pipe 10 via a hot water storage circulating pump 8; a hot water storage tank bypass pipe line 19 for bypassing the hot water storage tank 1 by a first switching means 18 provided in the heat storage circulation circuit 11; a going pipe bypass pipe line 21 for bypassing the going pipe 9 by a second switching means 20 provided in the heat storage circulation circuit 11; a bath circulation circuit 17 for circulating hot water in the bathtub by a bath circulating pump 13; a heater 23 connected to the going pipe bypass pipe line 21; and a radiator 24 connected to the bath circulation circuit 17. An accumulator is constituted by the heater 23, the radiator 24 and a heat storage body 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water heater that performs bath hot water supply.

  Conventionally, a bath warmer of this type of water heater has a heat storage circuit including a heat source, a heat storage circulation pump, and a hot water tank, and a hot water storage heat installed in the upper part of the bathtub, the bath circulation pump, and the hot water tank. It consists of a bath circulation circuit consisting of an exchanger, and a hot water tank is connected to a hot water supply pipe and a hot water supply pipe, and the hot water supply pipe and the hot water supply pipe are connected via a hot water mixing valve to a hot water branch pipe to supply hot water at a predetermined temperature. I was supplying.

  The bath is kept warm by operating the bath circulation pump to send the hot water whose temperature has dropped in the bathtub to the heat exchanger and heating it back to the bathtub to keep the hot water in the bathtub at a predetermined temperature. For replenishment, the hot water valve provided in the hot water pipe is opened and hot water is supplied from the hot water supply pipe to the bathtub heat insulation circuit (see, for example, Patent Document 1).

FIG. 7 shows a conventional bath warmer described in Patent Document 1. In FIG. As shown in FIG. 7, a hot water supply circuit 6 including a hot water tank 1, a water supply pipe 2, a hot water supply pipe 3, a hot water mixing valve 4, and a water supply branch pipe 5, a heat source 7, a hot water tank 1, a hot water circulation pump 8, A heat storage circuit 11 provided with a pipe 9 and a return pipe 10, and a bath circuit 17 provided with a bathtub 12, a bath circulation pump 13, a hot water storage heat exchanger 14, a hot water pipe 15 and a hot water valve 16. Has been.
JP 2003-214711 A

  However, in the above-described conventional configuration, the hot water stored in the upper part of the hot water tank is cooled because the bath circulation pump is operated during the bath warming operation so that the hot water in the bath flows through the radiator. If the temperature stratification in the hot water tank collapses, the hot water supply efficiency is lowered, and the temperature of the water in the lower part of the hot water tank is increased, the heat storage operation is performed, and the hot water circulation pump is operated to increase the temperature in the lower part of the hot water tank. Since the heated water is sent to the heat source, the heat source such as a heat pump has a problem that the incoming water temperature becomes high and the efficiency of the heat storage operation is lowered.

  This invention solves the said conventional subject, and it aims at providing the water heater which has a highly efficient bath heat retention apparatus.

In order to solve the above-described conventional problems, a water heater of the present invention includes a hot water supply circuit having a hot water storage tank, a water supply pipe, and a hot water supply pipe, and the hot water storage tank and a heat source through a hot water storage circulation pump. The heat storage circuit connected in a ring, the hot water tank bypass pipe for bypassing the hot water tank by the first switching means provided in the heat storage circuit, and the second switching means provided in the heat storage circuit. An outer pipe bypass pipe that bypasses the pipe, a bath circulation circuit that circulates hot water in the bathtub with a bath circulation pump, a heater that is connected to the outgoing pipe bypass pipe, and a radiator that is connected to the bath circulation circuit The heat storage circuit is configured by the heater, the radiator and the heat storage body, and the heat storage circulation circuit is switched to the outgoing pipe bypass pipe side and the hot water tank bypass pipe side by switching the pipe line. By operating the pump, The heat storage body can be heated and stored by a heater connected to the forward pipe bypass line, and the heat can be received from the heat storage body by a radiator connected to the bath circulation circuit to heat the hot water in the bathtub and keep it warm. Therefore, the heat insulation operation of the bathtub is performed while maintaining the temperature stratification in the hot water tank, and the efficiency of the heat storage operation is improved by improving the hot water supply efficiency and keeping the inlet temperature of the heat source low even in the heat storage operation of the hot water tank. Can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water heater which improved the operating efficiency of the apparatus in hot_water | molten_metal supply and heat storage can be provided by performing the heat insulation operation of a bathtub, without destroying the temperature stratification in a hot water storage tank.

  A first aspect of the invention is a hot water supply circuit having a hot water storage tank, a water supply pipe, and a hot water supply pipe, and a heat storage circulation circuit in which the hot water storage tank and a heat source are connected in an annular shape by a forward pipe and a return pipe via a hot water circulation pump, A hot water tank bypass pipe that bypasses the hot water tank with a first switching means provided in the heat storage circuit, and an outer pipe bypass pipe that bypasses the forward pipe with a second switching means provided in the heat storage circuit; A bath circulation circuit that circulates hot water in a bathtub with a bath circulation pump, a heater connected to the outgoing pipe bypass pipe, and a radiator connected to the bath circulation circuit, the heater, the radiator and the heat storage The hot water heater is characterized in that it constitutes a heat accumulator with the body. The heat accumulation in the heat accumulator is operated by operating the hot water circulation pump to heat the circulating water with the heat source and sending it to the outgoing pipe bypass line. Circulating water that has become low temperature after storing the heat storage body with a heater The hot water circulation pump returns to the heat source through the hot water tank bypass pipe, and the heat insulation operation of the bathtub circulates in the radiator by operating the bath circulation pump to send the hot water from the bathtub to the heat radiator of the heat accumulator and receiving heat from the heat accumulator. Water will be heated and returned to the bathtub, and in both the heat storage operation of the regenerator and the bath heat retention operation, low-temperature circulating water will not flow over the hot water tank, so the temperature stratification of the hot water tank can be maintained. In addition, even in the heat storage operation of the hot water storage tank, the temperature of the water entering the heat source can be kept low to improve the efficiency.

  A second invention is a hot water supply circuit having a hot water storage tank, a water supply pipe, and a hot water supply pipe, and a heat storage circulation circuit in which the hot water storage tank and a heat source are connected in an annular shape by a forward pipe and a return pipe via a hot water circulation pump, A hot water tank bypass pipe that bypasses the hot water tank with a first switching means provided in the heat storage circuit, and an outer pipe bypass pipe that bypasses the forward pipe with a second switching means provided in the heat storage circuit; A bath circulation circuit that circulates hot water in a bathtub with a bath circulation pump, a heater connected to the outbound pipe bypass conduit, and a bath heat exchanger connected to the outbound conduit bypass conduit and the bath circulation circuit The heater and the heat accumulator constitute a heat accumulator. At the start of the bath heat insulation operation, the heat is taken out of the heat accumulator, and the bath heat exchanger is used to heat the hot water in the bathtub. Directly bathtub in bath heat exchanger by increasing output By heating the water, and quickly launch of bath maintenance operation, miniaturized regenerator, it is possible to improve the bath heat insulation capability.

  According to a third aspect of the present invention, a circulation pump is provided in the outgoing pipe bypass pipe. After the bathing, the bath circulating pump and the circulating pump provided in the outgoing pipe bypass pipe are operated simultaneously, so that the remaining hot water in the bathtub is reduced. The heat is collected by flowing through the bath heat exchanger and collected by heating the regenerator with the heater of the regenerator provided in the outgoing pipe bypass pipe, reducing the amount of heat stored in the heat source and reducing the efficiency of the device Can be improved.

  4th invention makes a 2nd switching means a mixing valve, is provided with the control apparatus and the temperature detection means provided downstream of the said mixing valve, and operates the said mixing valve based on the detected temperature of the said temperature detection means The control device controls the mixing valve so that the value of the temperature detection means at the outlet of the mixing valve is equal to or higher than the hot water temperature stored in the upper part of the hot water tank, By adjusting the flow rate of the outgoing pipe bypass pipe according to the output of the heat source, heat is stored in the heat accumulator installed in the outgoing pipe bypass pipe, and at the same time the temperature stratification of the hot water tank is maintained, and the temperature increases from the top. You can store hot water.

The fifth invention is characterized in that the outgoing pipe bypass pipe and the hot water supply pipe are connected via a hot water supply valve, and hot water heated by a regenerator provided in the outgoing pipe bypass pipe is stored in a hot water storage tank. By mixing with hot water from a hot water pipe connected to the water supply, even if there is no load of bath insulation, the heat stored in the regenerator is used for other hot water loads to reduce the amount of hot water from the hot water tank Efficiency.

  A sixth invention is characterized by comprising a water supply branch pipe connecting a hot water supply pipe and a water supply pipe, and connecting the outgoing pipe bypass pipe and the water supply branch pipe via a water supply valve. By supplying hot water heated by the regenerator provided in the pipe bypass line with the water supply, it becomes possible to use the low-temperature heat recovered from the remaining hot water in the bathtub and stored in the regenerator, The efficiency of the apparatus can be improved by reducing the amount of hot water discharged from the hot water tank.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a water heater having a bath heat retention device according to the first embodiment of the present invention.

  In FIG. 1, a hot water supply circuit 6 includes a hot water storage tank 1, a water supply pipe 2, a hot water supply pipe 3, a hot water supply mixing valve 4, and a water supply branch pipe 5, and a heat storage circulation circuit 11 passes through the hot water tank 1 and the heat source 7. A pipe 9 and a return pipe 10 having a hot water circulation pump 8 are connected in a ring shape.

  The heat storage circulation circuit 11 includes a hot water tank bypass pipe 19 that bypasses the hot water tank 1 by the first switching means 18 using a three-way valve and the like, and an outgoing pipe bypass pipe 21 that bypasses the outgoing pipe 9 by the second switching means 20. The bath circulation circuit 17 is provided with a bath circulation pump 13 for circulating hot water in the bathtub 12.

  The heat accumulator 22 includes a heater 23 connected to the outgoing pipe bypass conduit 21, a radiator 24 connected to the bath circulation circuit 17, and a heat accumulator 25.

  About the bath heat retention apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the hot water stored in the hot water tank 1 is heated by the heat source 7 by switching the first switching means 18 to the hot water tank 1 side and switching the second switching means 20 to the outgoing pipe 9 side and operating the hot water circulation pump 8. Hot water is stored in hot water by forming a temperature stratification in order from the top of the hot water tank 1, and hot water is supplied to the lower part of the hot water tank 1 from the water supply pipe 2 of the hot water supply circuit 6, and hot water is taken out from the upper part. The hot water is supplied to the high temperature side inlet of the hot water supply mixing valve 4 and mixed with hot water supplied from the feed water branch pipe 5 to a predetermined temperature to supply hot water.

  For the heat storage in the heat accumulator 22, the first switching means 18 of the heat storage circuit 11 is switched to the hot water tank bypass line 19 side, and the second switching means 20 is switched to the forward pipe bypass line 21 side to store the hot water circulation pump. 8, high-temperature water heated by the heat source 7 is circulated to the outgoing pipe bypass pipe 21, and the heat storage body 25 is heated and stored by the heater 23 of the heat storage 22. The pump 13 is operated, the hot water in the bathtub 12 is circulated through the bath circulation circuit 17, the heat is received from the heat storage body 25 by the radiator 24, and returned to the bathtub 12 to be kept warm. Therefore, the temperature stratification of the heat storage tank 1 can be maintained since the circulating water does not flow into the hot water storage tank 1.

As described above, in the present embodiment, the hot water storage tank bypass pipe 19 that bypasses the hot water tank 1 by the first switching means 18 and the second switching means 20 that bypasses the outgoing pipe 9 in the heat storage circulation circuit 11. The pipe bypass pipe 21 is provided, and the heat accumulator 22 includes a heater 23 connected to the outgoing pipe bypass pipe 21, a radiator 24 connected to the bath circulation circuit 7, and a heat accumulator 25. Thus, the circulating water heated by the heat source 7 flows from the heater 23 provided in the outgoing pipe bypass pipe 21 to the hot water tank bypass pipe 19 to store heat in the heat storage body 25, and the hot water in the bathtub 12 is stored in the bath circulation circuit 17. The heat is received from the heat accumulator 25 by the radiator 24 to keep the bath warm, and the hot water is stored in the heat storage tank 1 without using the hot water in the heat storage tank 1. Can keep the temperature stratification in the tank 1 , It is possible to improve the efficiency of the device.

(Embodiment 2)
FIG. 2 shows a block diagram of a water heater having a bath heat insulation device according to a second embodiment of the present invention.

  In FIG. 2, a heat accumulator 22 having a heater 23 and a heat accumulator 25 and a bath heat exchanger 26 are provided in the outgoing pipe bypass line 21, and the heat accumulator 22 and the bath heat exchanger 26 are connected in series. Connected to and configured.

  About the bath heat retention apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the bath is kept warm by operating the bath circulation pump 13 to circulate the hot water in the bathtub 12 through the bath circulation circuit 17 and heating it with the bath heat exchanger 26 provided in the outgoing pipe bypass pipe 21. The heat storage circulation circuit 11 switches the first switching means 18 to the hot water tank bypass pipeline 19 side, and switches the second switching means 20 to the outgoing pipe bypass pipeline 21 side, so that the hot water storage circulation pump is maintained. By operating 8, the heat source 7 and the bath heat exchanger 26 are circulated in order from the heat source 7 to the outgoing pipe bypass pipe 21.

  At the start of the bath heat insulation operation, the temperature of the hot water from the heat source 7 has not risen sufficiently. Therefore, the heater 23 of the heat accumulator 22 receives heat from the heat accumulator 25 and rises to a predetermined temperature in the bath heat exchanger. 26, the function of keeping the bath warm will be exhibited from the beginning of operation.

  In a state where the heat source 7 is sufficiently raised, the amount of heat stored in the heat accumulator 22 also reaches a predetermined amount, so that the heat accumulator 22 passes through without storing heat and directly exchanges heat with the bath heat exchanger 26.

  As described above, in the present embodiment, the outlet pipe bypass line 21 is provided with the heat storage device 22 including the heater 23 and the heat storage body 25 and the bath heat exchanger 26 connected in series. At the start of the bath heat insulation operation, the heat source 22 is heated until the heat source 7 starts operation and outputs a predetermined output. Therefore, a device such as a heat pump that takes time to start up is installed. However, the start-up performance can be improved, and the heat accumulator 22 has only the ability to store the amount of heat required for start-up, and the apparatus can be downsized.

(Embodiment 3)
FIG. 3 shows a configuration diagram of a water heater having a bath heat insulation apparatus according to a third embodiment of the present invention.

  In FIG. 3, a circulation pump 27 is provided in the outgoing pipe bypass pipe 21, and a heat accumulator 22, a bath heat exchanger 26, and a circulation pump 27 provided with a heater 23, a heat accumulator 25 are connected in series by piping. Thus, the outgoing pipe bypass pipe 21 is configured.

  About the bath heat retention apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

First, the bath is kept warm by operating the bath circulation pump 13 to circulate hot water in the bathtub 12 through the bath circulation circuit 17 and heating it with the bath heat exchanger 26 provided in the outgoing pipe bypass pipe 21. 12, the heat storage circuit 11 switches the second switching means 20 to the heat source 7 side and operates the circulation pump 27, so that the heat of the heat storage 22 is transferred to the bath heat exchanger 26. Will be communicated.

  As described above, in the present embodiment, by providing the circulation pump 27 in the outgoing pipe bypass line 21, the circulation power on the heat storage circuit 11 side in the heat storage operation of the heat storage 22 and the bath heat insulation operation is reduced. Performance can be improved.

  Furthermore, after bathing, it becomes possible to operate the bath circulation pump 13 and the circulation pump 27 to recover the heat stored in the remaining hot water in the bathtub 12 to the regenerator 22 and return it to the bath again.

(Embodiment 4)
FIG. 4 shows a configuration diagram of a water heater having a bath heat insulation device according to a fourth embodiment of the present invention.

  In FIG. 4, a mixing valve 28, a temperature detection means 29, and a control device 30 are provided in the outgoing pipe bypass pipeline 21, and the temperature detection means 29 is provided downstream of the mixing valve 28, and the control device 30. Controls the mixing valve 28 according to the temperature detected by the temperature detecting means 29.

  About the bath heat retention apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, hot water is stored in the hot water tank 1 by switching the first switching means 18 to the hot water tank 1 side and operating the hot water circulation pump 8 so that the hot water heated by the heat source 7 is subjected to temperature stratification in order from the upper part of the hot water tank 1. At this time, the heat is stored in the heat accumulator 25 by the heater 23 of the heat accumulator 22 by diverting the mixed valve 28 to the outgoing pipe bypass pipe 21 side.

  The control device 30 controls the outgoing pipe 9 and the outgoing pipe according to the output of the heat source 7 so that the detected value of the temperature detecting means 29 provided at the outlet of the mixing valve 28 becomes equal to or higher than the hot water storage temperature at the upper part of the hot water tank 1. The flow rate ratio of the bypass line 21 is controlled by the mixing valve 28.

  As described above, in the present embodiment, the heat storage circuit 11 includes the mixing valve 28, the temperature detection means 29 provided downstream of the mixing valve 28, and the mixing valve 28 according to the detected temperature of the temperature detection means 29. The control device 30 controls the temperature detection means 29 so that the value of the temperature detection means 29 becomes equal to or higher than the hot water storage temperature in the upper part of the hot water storage tank 1 according to the output of the heat source 7. The flow rate ratio of the outgoing pipe bypass pipe 21 is controlled by the mixing valve 28, and warm water above the hot water temperature flows into the upper inlet of the hot water tank 1, so that hot water is stored while maintaining temperature stratification and at the same time the heat accumulator 22. Therefore, it is possible to realize a highly efficient device with excellent controllability.

(Embodiment 5)
FIG. 5 is a block diagram of a water heater having a bath heat insulation device according to a fifth embodiment of the present invention.

  In FIG. 5, the outgoing pipe bypass pipe 21 is branched and connected to the hot water supply pipe 3 of the hot water storage tank 1 through the hot water supply valve 31, and is branched from the outlet side of the regenerator 22 of the outgoing pipe bypass pipe 21. A hot water supply pipe 3 at the outlet of the hot water tank 1 is branched and connected via a hot water supply valve 31.

  About the bath heat retention apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

First, when the heat accumulator 22 stores heat by the output of the heat source 7, the heat accumulator 25 becomes high temperature, and when the load of the bath heat insulation does not occur for a long period, the heat accumulator 22 is left in a high temperature state for a long time. Then, heat loss due to heat radiation from the heat accumulator 22 occurs.

  When it is detected that a bath heat-retaining load is not generated, the hot water supply valve 31 is opened to operate the hot water storage circulation pump 8, and the heat is received from the heat storage body 25 by the heater 23 of the heat storage 22 of the outgoing pipe bypass pipe 21. The hot water that has become hot is supplied to the hot water supply pipe 3 of the hot water storage tank 1 and mixed with the hot water at the hot water supply mixing valve 4 so as to have a predetermined temperature and supplied to the hot water supply, thereby minimizing heat loss from the regenerator 22. Therefore, the amount of hot water discharged from the hot water storage tank 1 is reduced.

  As described above, in the present embodiment, the branch pipe 21 is branched and connected to the hot water supply pipe 3 of the hot water storage tank 1 via the hot water supply valve 31, so that the heat accumulator is not generated when the load for keeping the bath warm is not generated. The heat stored in 22 is used for another hot water supply load, and a highly efficient apparatus with little heat loss can be realized.

(Embodiment 6)
FIG. 6 shows a block diagram of a water heater having a bath heat insulation apparatus according to a sixth embodiment of the present invention.

  In FIG. 6, the outgoing pipe bypass pipe 21 is branched and connected to the water supply branch pipe 5 of the hot water supply mixing valve 4 via the water supply valve 32, and branches from the outlet side of the regenerator 22 of the outgoing pipe bypass pipe 21. The water supply branch pipe 5 is connected to the hot water supply mixing valve 4 through the water supply valve 32.

  About the bath heat retention apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, after bathing, the hot water in the bathtub 12 is circulated through the bath circulation circuit 17 and the heat storage body 25 is heated by the radiator 24 of the outgoing pipe bypass pipe 21, so that the remaining hot water of the bathtub 12 is supplied to the heat storage 22. It will be collected.

  When a hot water supply load is generated, the water supply valve 32 is opened and the hot water circulation pump 8 is operated. The heater 23 of the heat accumulator 22 provided in the outgoing pipe bypass pipe 21 receives heat from the heat accumulator 25 and raises the temperature. Hot water is supplied to the water supply branch pipe 5 and mixed with the hot water stored in the hot water storage tank 1 by the hot water supply mixing valve 4 so that the hot water is supplied at a predetermined temperature, whereby the high-temperature flow rate supplied from the hot water storage tank 1 of the hot water mixing valve 4 is increased. Will be reduced.

  As described above, in this embodiment, the remaining hot water heat in the bathtub 12 is recovered by branching the outgoing pipe bypass pipe 21 to the feed water branch pipe 5 of the hot water supply mixing valve 4 via the feed water valve 32. Therefore, the high-efficiency apparatus can be realized by reducing the amount of hot water discharged from the hot water tank 1 by using low-temperature heat.

  As described above, since the hot water supply apparatus according to the present invention can be operated with high efficiency, it can be applied to uses such as hot water supply, heating, a dryer, and an industrial waste heat recovery apparatus.

Configuration diagram of a water heater in Embodiment 1 of the present invention Configuration diagram of a water heater in Embodiment 2 of the present invention Configuration diagram of a water heater in Embodiment 3 of the present invention Configuration diagram of a water heater in Embodiment 4 of the present invention Configuration diagram of a water heater in Embodiment 5 of the present invention Configuration diagram of a water heater in Embodiment 6 of the present invention Configuration diagram of a water heater with a conventional bath warmer

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water tank 2 Water supply pipe 3 Hot water supply pipe 4 Hot water supply mixing valve 5 Water supply branch pipe 6 Hot water supply circuit 7 Heat source 8 Hot water storage circulation pump 9 Outgoing pipe 10 Return pipe 11 Thermal storage circulation circuit 12 Bathtub 13 Bath circulation pump 14 Hot water storage heat exchanger 17 Bath circulation Circuit 18 First switching means 19 Hot water tank bypass pipe 20 Second switching means 21 Outgoing pipe bypass pipe 22 Heat storage 23 Heater 24 Heat radiator 25 Heat storage body 26 Bath heat exchanger 27 Circulation pump 28 Mixing valve 29 Temperature detection means 30 Control device 31 Hot water supply valve 32 Water supply valve

Claims (6)

A hot water supply circuit having a hot water storage tank, a water supply pipe, and a hot water supply pipe, a heat storage circulation circuit in which the hot water storage tank and a heat source are annularly connected to each other through a hot water circulation pump through a forward pipe and a return pipe, and provided in the heat storage circulation circuit The hot water tank bypass pipe bypassing the hot water tank with the first switching means, the forward pipe bypass pipe bypassing the forward pipe with the second switching means provided in the heat storage circulation circuit, and the bath circulation pump A bath circulation circuit for circulating hot water, a heater connected to the outgoing pipe bypass pipe, and a radiator connected to the bath circulation circuit, and the heater, the radiator, and the heat accumulator serve as a heat accumulator. A water heater characterized by comprising. A hot water supply circuit having a hot water storage tank, a water supply pipe, and a hot water supply pipe, a heat storage circulation circuit in which the hot water storage tank and a heat source are annularly connected to each other through a hot water circulation pump through a forward pipe and a return pipe, and provided in the heat storage circulation circuit The hot water tank bypass pipe bypassing the hot water tank with the first switching means, the forward pipe bypass pipe bypassing the forward pipe with the second switching means provided in the heat storage circulation circuit, and the bath circulation pump A bath circulation circuit for circulating hot water, a heater connected to the outgoing pipe bypass pipe, and a bath heat exchanger connected to the outgoing pipe bypass pipe and the bath circulation circuit, the heater and the heat storage A water heater comprising a body and a heat accumulator. The water heater according to claim 1 or 2, wherein a circulation pump is provided in the outgoing pipe bypass pipe. The second switching means is a mixing valve, and includes a control device and a temperature detecting means provided downstream of the mixing valve, and the mixing valve is operated based on a temperature detected by the temperature detecting means. Item 4. A water heater according to any one of Items 1 to 3. The hot water supply apparatus according to any one of claims 1 to 4, wherein the outgoing pipe bypass pipe and the hot water supply pipe are connected via a hot water supply valve. 6. A water supply branch pipe connecting a hot water supply pipe and a water supply pipe is provided, and the outgoing pipe bypass pipe and the water supply branch pipe are connected via a water supply valve. The water heater described in 1.

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