JP2010145042A - Hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply device capable of miniaturizing a casing by selecting an installation position of a device in the casing receiving a hot water storage tank. <P>SOLUTION: The hot water supply device 10 including the hot water storage tank 13 having a water supply port 11 at a bottom and a first hot water tapping port 12 for distributing hot water at a ceiling, and the casing 25 having a rectangular cross section, and receiving the hot water storage tank 13 is further provided with a solar heating means 23 including a solar heat collecting section 17, a heat exchanging section 18 received in a bottom of the hot water storage tank 13, a going pipe 20 provided with a circulation pump 19 for allowing a heat medium to flow from the heat exchanging section 18 to the solar heat collecting section 17, and a returning pipe 21 for allowing the heat medium to flow from the solar heat collecting section 17 to the heat exchanging section 18. The circulation pump 19 and an accumulator tank 40 are received in the casing 25, and reserve tanks 42, 43 transferring and receiving the heat medium to the accumulator tank 40 accompanied by the fluctuation of heat medium pressure in the accumulator tank 40 are disposed at rectangular corners of the casing 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a hot water supply apparatus that achieves a compact casing for housing a hot water storage tank.

Solar heat that heats the water in the hot water storage tank with a heat medium provided in the bottom inside the hot water storage tank, circulating the heat medium between the heat exchanging part and the solar heat collecting part and heated in the solar heat collecting part There has been proposed a hot water supply apparatus comprising heating means and heat pump heating means for guiding water from the position above the heat exchange section at the bottom of the hot water storage tank to the heat pump, heating it with the heat pump to make hot water, and storing it on the hot water supply side of the hot water storage tank. (For example, refer to Patent Document 1).

JP 2002-162109 A

In general, the solar heating means includes a return pipe that flows the heat medium heated in the solar heat collection section to the heat exchange section, a forward pipe that flows the heat medium that has passed through the heat exchange section to the solar heat collection section, and a forward pipe. An expansion tank that is attached and absorbs a volume change due to expansion and contraction of the heat medium, and a circulation pump that is attached to an outgoing pipe on the downstream side of the expansion tank are provided. In order to reduce the capacity of the expansion tank, the expansion tank includes an accumulation tank that temporarily stores a heat medium that moves from the heat exchange unit to the solar heat collection unit, and a reserve tank that communicates with the accumulation tank. During expansion, the heat medium is flowed from the accumulation tank to the reserve tank, and when the heat medium is contracted, the heat medium is moved from the reserve tank to the accumulation tank.

However, if the expansion tank is composed of an accumulator tank and a reserve tank, it is necessary to store the accumulator tank and the reserve tank in the casing in which the hot water storage tank is stored, and the outer dimension of the casing becomes large in order to secure a tank storage space. . For this reason, when it is going to comprise a hot-water supply apparatus by using a heat pump type heating means as a base device, the casing containing the hot water storage tank cannot be diverted, and it is necessary to produce and store a large-sized exclusive casing. In addition, there is a problem that the manufacturing cost and the storage cost increase.

The present invention has been made in view of the above circumstances, and provides a hot water supply apparatus that reduces the casing by selecting the installation position of each device provided in the solar heating means in the casing that houses the hot water storage tank. With the goal.

The hot water supply apparatus according to the present invention that meets the above-described object includes a hot water storage tank that includes a water supply port through which water flows into the bottom, a first hot water outlet that sends out hot water stored in the ceiling, and the hot water storage tank. In a hot water supply apparatus having a rectangular casing with a flat cross section,
A solar heat collecting part for heating the heat medium outside the casing; a heat exchange part housed inside the bottom of the hot water storage tank; and a circulation pump for flowing the heat medium from the heat exchange part to the solar heat collection part A solar heating means having a forward piping provided and a heating medium circulation path provided with a return piping for flowing a heating medium from the solar heat collecting section to the heat exchanging section;
An accumulator tank that is provided in the forward pipe upstream of the circulation pump and temporarily stores the heat medium, and accepts the heat medium flowing out from the accumulator tank when the pressure of the heat medium in the accumulator tank rises; A reserve tank for supplying the heat medium to the accumulator tank when the pressure of the heat medium in the accumulator tank decreases, and the circulation pump are disposed in the casing, and the reserve tank is disposed at a rectangular angle in the casing. Placed in the department.

In the hot water supply apparatus according to the present invention, the hot water storage tank includes a first sub-tank in which the first hot water outlet is provided in the ceiling portion, and a hot water inlet through which hot water flows is provided in the ceiling portion or the periphery thereof, and the water supply port. Is provided at the bottom and the heat exchange part is housed inside the bottom, and a communication pipe connecting the lower part of the first subtank and the upper part of the second subtank, Preferably, the first sub tank and the second sub tank are erected side by side on the bottom plate of the casing, and the reserve tank is disposed in a gap between the second sub tank and the casing.
The reserve tank includes first and second sub-reservoir tanks connected to the bottom, and the bottoms of the first and second sub-reserve tanks are connected to the accumulation tank via a connection pipe, The first and second sub-reservoir tanks are respectively disposed in two gaps formed between the casing and the second sub-tank, and at the bottoms of the first and second sub-reserve tanks, It is preferable that a discharge mechanism for the heat medium is provided.

In the hot water supply apparatus according to the present invention, the upper portions of the first and second sub-reserve tanks are connected via a second connecting pipe, and the upper portions of the first and second sub-reserve tanks and the second connection are connected. It is preferable that a vent pipe for opening the first and second sub-reservation tanks to the atmosphere is connected to one or both of the pipes.

In the hot water supply apparatus according to the present invention, since the reserve tank is arranged at the rectangular corner portion in the casing to effectively use the empty space in the casing, the casing for the hot water storage tank in which the heat exchange portion of the solar heating means is accommodated is provided. Can be used as is.

In the hot water supply apparatus according to the present invention, the hot water storage tank includes a first sub tank, a second sub tank, a communication pipe connecting the lower portion of the first sub tank and the upper portion of the second sub tank, and When the first sub tank and the second sub tank are erected side by side on the bottom plate of the casing, and the reserve tank is disposed in the gap between the second sub tank and the casing, a large empty space in the casing can be effectively used.

In the hot water supply apparatus according to the present invention, the reserve tank includes first and second sub-reserve tanks connected to the bottom, and the bottoms of the first and second sub-reserve tanks are connected to the accumulator tank via the connecting pipe. The first and second sub-reservoir tanks connected to each other are disposed in two gaps formed between the casing and the second sub-tank, respectively, and the bottoms of the first and second sub-reservoir tanks are heated. When a medium discharge mechanism is provided, the discharge mechanism can be operated to simultaneously discharge the heat medium from the first and second sub-reservoir tanks, improving workability and reducing the number of parts. Can reduce costs.

In the hot water supply apparatus according to the present invention, the upper parts of the first and second sub-reservoir tanks are connected via the second connecting pipe, and either the upper part of the first or second sub-reservoir tank or the second connecting pipe is used. If either or both of the vent pipes are connected to open the first and second sub-reservoir tanks to the atmosphere, evaporating the heat medium in the first and second sub-reservoir tanks by lengthening the vent pipes. Can be suppressed.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a partially omitted perspective view showing a device arrangement in a casing for storing a hot water storage tank of a hot water supply apparatus according to an embodiment of the present invention, FIG. 2 is an explanatory view of the hot water supply apparatus, and FIG. FIG. 4 is a plan view showing the arrangement of the first and second sub-tanks and the first and second sub-reservoir tanks in the casing.

As shown in FIGS. 1 and 2, a hot water supply apparatus 10 according to an embodiment of the present invention includes a first hot water outlet that feeds hot water stored in a ceiling portion through a water supply port 11 into which water flows into the bottom portion. 12 through a hot water storage tank 13 provided around the ceiling portion of the hot water storage tank 13, and the water taken out from the water intake 14 provided at the bottom of the hot water storage tank 13 is converted into hot water by midnight power. A heating source 16 supplied to the hot water storage tank 13 and a casing 25 having a rectangular cross section for housing the hot water storage tank 13 are provided. In addition, the hot water supply apparatus 10 includes a solar heat collecting part 17 that is outside the casing 25 and heats an antifreeze that is an example of a heat medium, a heat exchanging part 18 housed inside the bottom of the hot water storage tank 13, and heat exchange. A return pipe 20 provided with a circulation pump 19 for flowing the antifreeze liquid from the section 18 to the solar heat collecting section 17 and a heating medium circulation path 22 provided with a return pipe 21 for flowing the antifreeze liquid from the solar heat collecting section 17 to the heat exchange section 18. The solar heating means 23 which has is added. Further, the hot water supply apparatus 10 is provided with a hot water supply circuit 24 that is connected to the first hot water outlet 12 and supplies hot water.
Hereinafter, the hot water supply apparatus 10 will be described with reference to FIGS. 1 and 2, and the arrangement of the devices in the casing 25 will be described with reference to FIGS. 1, 3, and 4.

The hot water storage tank 13 includes a first sub-tank 26 in which a first outlet 12 is provided at the ceiling, a pouring port 15 through which hot water flows is provided around the ceiling (or the ceiling), and a water supply 11 at the bottom. A second sub-tank 27 is provided and the heat exchange unit 18 is housed inside the bottom, and a communication pipe 28 connecting the lower portion of the first sub-tank 26 and the upper portion of the second sub-tank 27 is provided. Here, the water supply port 11 and a water supply pipe (not shown) are connected via a water conduit 31 provided with check valves 29 and 30 on both sides, respectively, and a portion between the check valves 29 and 30 in the water conduit 31. Are provided with a water supply thermistor 32 which is an example of temperature measuring means for measuring the temperature of water flowing in from the water supply pipe and a pressure reducing valve 33 for adjusting the pressure of water flowing in from the water supply pipe.

The heat source 16 includes a heat pump unit 34 that heats water to make hot water, and a boiling pump 35 that supplies water taken from a water intake port 14 provided at the bottom of the second sub-tank 27 to the inlet side of the heat pump unit 34. And a heat pump return pipe 37 for connecting the outlet side of the heat pump unit 34 and the hot water inlet 15 of the first sub tank 26 to supply hot water produced by the heat pump unit 34 to the first sub tank 26. have. Thereby, the water taken out from the water intake 14 provided at the bottom of the second sub tank 27 can be made into hot water and supplied to the first sub tank 26 via the hot water inlet 15 for storage.

Further, the heating source 16 has a second heat pump return pipe 39 for returning the hot water produced by the heat pump unit 34 to the bottom of the second sub tank 27 through a heat pump return three-way valve 38 provided in the heat pump return pipe 37. ing. By switching the heat pump return three-way valve 38, the water taken out from the second sub tank 27 can be made into hot water and returned to the second sub tank 27 via the second heat pump return pipe 39 for storage. For this reason, the water in the second sub tank 27 is warmed with the antifreeze liquid heated by the solar heat collecting unit 17 during the day, and the warmed water is heated by the heat pump unit 34 at night and stored in the second sub tank 27 as hot water. be able to.

The heat medium circulation path 22 includes a return pipe 21 for flowing the antifreeze liquid heated by the solar heat collecting section 17 to the heat exchange section 18, an outgoing pipe 20 for flowing the antifreeze liquid that has passed through the heat exchange section 18 to the solar heat collection section 17, and An antifreeze liquid that is attached to the outgoing pipe 20 and moves from the heat exchange part 18 to the solar heat collecting part 17 flows in from the upper part, temporarily stores it, and then flows out from the lower part, and attached to the outgoing pipe 20 on the downstream side of the accumulator tank 40. The circulating pump 19 is provided. The heat medium circulation path 22 includes first and second sub-reservation tanks 42 and 43 whose bottoms are connected to an accumulator tank 39 via a connecting pipe 41 connected to the side of the accumulator tank 40. . The first sub-reserve tank 42 and the second sub-reserve tank 43 constitute a reserve tank. In addition, the part which connects the 1st and 2nd sub reserve tanks 42 and 43 of the connection pipe 41 is an example of the discharge mechanism which discharges the antifreezing liquid in the 1st and 2nd sub reserve tanks 42 and 43. A certain discharge valve 44 is provided.

By connecting the accumulator tank 40 and the first and second sub-reservoir tanks 42 and 43 via the connecting pipe 41, when the antifreeze liquid in the accumulator tank 40 is expanded, the antifreeze liquid is connected via the connecting pipe 41. It is possible to flow into the second sub-reservoir tanks 42 and 43 and to prevent an increase in the pressure of the antifreeze liquid in the heat medium circulation path 22. Further, when the temperature of the antifreeze liquid in the accumulator tank 40 decreases and the antifreeze liquid contracts, the antifreeze liquid flows from the first and second reserve tanks 42 and 43 into the accumulator tank 40 via the connecting pipe 41, and the heat medium The circulation path 22 can be filled with antifreeze.

Here, the inflow of the antifreeze liquid into the first and second sub-reserve tanks 42 and 43 and the outflow of the antifreeze liquid from the first and second sub-reserve tanks 42 and 43 are the first and second sub-reserve tanks. Since it is carried out from the bottom of the antifreeze liquid, the liquid level of the antifreeze liquid stored in the first and second sub-reservoir tanks 42 and 43 does not fluctuate drastically when the antifreeze liquid flows in and out, and air is caught in the antifreeze liquid Can be prevented. Further, since the antifreeze discharge valve 44 is provided in the connecting pipe 41, the discharge operation of the antifreeze liquid from the first and second sub-reservoir tanks 42 and 43 can be performed simultaneously by operating the discharge valve 44. Costs can be reduced by improving workability and reducing the number of parts.

Further, the heat medium circulation path 22 is connected to one end side via a solar three-way valve 45 provided in the return pipe 21, and the other end side is connected to the upper portion of the accumulator tank 40, and the solar heat collecting section 17. And a solar return thermistor 47 which is an example of temperature detecting means provided in the return pipe 21 between the solar three-way valve 45. Thereby, the temperature difference between the temperature of the antifreeze measured by the solar return thermistor 47 and the temperature of the water stored in the bottom of the second sub tank 27 is obtained, and the temperature difference is, for example, 5 ° C. or more. It can be determined that the operation is possible, and a case where the temperature difference is less than 5 ° C., for example, can be determined as the heat collection operation failure.

When it is determined that the heat collection operation is possible, the antifreeze liquid is passed through the return pipe 21 by operating the solar three-way valve 45 to operate the circulation pump 19 with the bypass path 46 and the return pipe 21 in a non-communication state. The water in the second sub tank 27 can be heated by supplying the heat exchange unit 18. On the other hand, when it is determined that the heat collecting operation is not successful, the solar three-way valve 45 is operated to bring the bypass passage 46 and the return pipe 21 into communication, and the circulation pump 19 is periodically (for example, 10 to 20 minutes) for a certain period of time ( For example, it is operated for 3 to 5 minutes), and the antifreeze liquid is returned from the solar heat collecting section 17 using a part of the return pipe 21, the solar three-way valve 45, the bypass path 46, the accumulator tank 40, and a part of the outgoing pipe 20. It can be circulated. As a result, the antifreeze liquid is supplied to the heat exchanging unit 18 only when the heat collecting operation is possible, so that the antifreeze liquid is not circulated wastefully between the solar heat collecting unit 17 and the heat exchanging unit 18. Energy saving operation of the road 22 becomes possible.

Upper portions of the first and second sub-reservoir tanks 42 and 43 are connected via a second connecting pipe 48, and the first and second sub-reserving tanks 42 and 43 are connected to the atmosphere in the second connecting pipe 48. An open vent tube 49 is connected. When the antifreeze liquid is heated and the pressure of the antifreeze liquid in the accumulator tank 40 becomes higher than the atmospheric pressure by opening the first and second sub reserve tanks 42 and 43 to the atmosphere, the antifreeze liquid is discharged from the accumulator tank 40 via the connecting pipe 41. Can be discharged and received by the first and second sub-reservoir tanks 42, 43. Further, when the temperature of the antifreeze liquid decreases and the pressure of the antifreeze liquid in the accumulator tank 40 becomes less than atmospheric pressure, the antifreeze liquid in the first and second sub-reservoir tanks 42 and 43 is transferred to the accumulator tank 40 through the connecting pipe 41. Can be supplied.

The hot water supply circuit 24 is connected to a hot water outlet pipe 50 connected to the first hot water outlet 12 of the ceiling portion of the first sub tank 26 and a second hot water outlet 51 provided in the ceiling portion of the second sub tank 27. A solar mixing valve 53 is provided for mixing hot water discharged from the first hot water outlet 12 and hot water discharged from the second hot water outlet 51, respectively connected to the second hot water outlet pipe 52. Further, the hot water supply circuit 24 is connected to a hot water supply pipe 54 connected to the outlet side of the solar mixing valve 53, a pressure reducing valve 33 of the water guide pipe 31, and a second water guide pipe 55 connected to an intermediate portion of the check valve 29, respectively. A hot water supply mixing valve 56 that mixes hot water sent through the hot water supply pipe 54 and water sent through the second water guide pipe 55 and a hot water supply pipe 57 connected to the outlet side of the hot water supply mixing valve 56 are provided. Here, the hot water supply pipe 54 and the hot water supply mixing valve 56 are connected via a check valve 58, and the second water guide pipe 55 and the hot water supply mixing valve 56 are connected via a check valve 59. The hot water supply pipe 54 is provided with a solar hot water thermistor 60 which is an example of temperature measuring means for measuring the temperature of hot water flowing through the hot water supply pipe 54, and the hot water supply pipe 57 measures the temperature of hot water flowing through the hot water supply pipe 57. The hot water supply thermistor 61 which is an example of the temperature measurement means to perform is provided.

Next, the device arrangement in the casing 25 that houses the hot water storage tank 13 of the hot water supply apparatus 10 will be described with reference to FIGS. 1, 3, and 4.
As shown in FIGS. 1, 3, and 4, in the casing 25 having a rectangular cross section, in addition to the first and second sub tanks 26 and 27 constituting the hot water storage tank 13, the upstream side of the circulation pump 19 is provided. An accumulator tank 40 and first and second sub-reservoir tanks 42 and 43 provided in the forward pipe 20 are accommodated. The casing 25 is disposed upright so as to surround the outside of the bottom plate 62 via a support 67 on a rectangular bottom plate 62 in plan view. Leg members 65 are attached to the four corners of the bottom plate 62. A partition wall 66 is erected on the bottom plate 62 between the accumulation tank 40 and the first sub tank 26. As a result, the accumulation tank 40 can be disposed above the bottom plate 62 via the partition wall 66, and other devices and piping can also be disposed via the partition wall 66.

Here, the first sub tank 26 and the second sub tank 27 are erected side by side on the bottom plate 62 with the first sub tank 26 facing the accumulation tank 40 side. In addition, the first and second sub-reservoir tanks 42 and 43 are arranged in a standing state with respect to the bottom plate 62 in two gaps formed between the casing 25 and the second sub-tank 27, respectively. . The connecting pipe 41 that communicates the accumulation tank 40 with the first and second sub-reservation tanks 42 and 43 descends from the accumulation tank 40 to the lower bottom plate 62, and the first and second sub-reservations on the bottom plate 62. It extends toward the tanks 42 and 43, branches, and is connected to the lower portions of the first and second sub-reserve tanks 42 and 43, respectively. A discharge valve 44 is attached to the front side of the branch portion, and a discharge port 68 of the discharge valve 44 is provided outside the casing 25 through the bottom plate 62. Thus, by opening the discharge valve 44, the antifreeze liquid in the first and second sub-reservoir tanks 42 and 43 can be discharged to the outside at the same time.

The second connecting pipe 48 that communicates with the upper portions of the first and second sub-reservoir tanks 42 and 43 is disposed along the second sub-tank 27 so as to face upward. A vent pipe 49 communicating with the second connecting pipe 48 is connected to the uppermost part of the second connecting pipe 48, passes through the upper side of the second sub tank 27, and is connected to the upper part of the first sub tank 26. After reaching, it descends to the bottom plate 62 along the first sub-tank 26, penetrates the casing 25 and protrudes to the outside. As a result, even if antifreeze overflows from the first and second sub-reservoir tanks 42 and 43, it can be recovered outside the casing 25.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, a vent pipe may be provided at the top of each of the first and second sub-reserve tanks.
When the hot water storage tank is a single tank, the first and second sub-reserve tanks can be arranged at two corners (rectangular corners) adjacent to the casing.
Furthermore, although the heat pump unit type heating source has been described as an example of the heating source of the hot water supply apparatus, a heating source such as an electric heater type or a kerosene combustion type can also be used.

It is a partially-omission perspective view which shows apparatus arrangement | positioning in the casing which accommodates the hot water storage tank of the hot water supply apparatus which concerns on one embodiment of this invention. It is explanatory drawing of the hot-water supply apparatus. It is a side view which shows the apparatus arrangement | positioning in the casing which accommodates the hot water storage tank of the hot-water supply apparatus. It is a top view which shows arrangement | positioning of the 1st and 2nd sub tank in a casing, and a 1st and 2nd sub reserve tank.

Explanation of symbols

10: Hot water supply device, 11: Water supply port, 12: First hot water outlet, 13: Hot water storage tank, 14: Water intake, 15: Hot water inlet, 16: Heat source, 17: Solar heat collecting unit, 18: Heat exchange unit , 19: Circulation pump, 20: Outward piping, 21: Return piping, 22: Heat medium circulation path, 23: Solar heating means, 24: Hot water supply circuit, 25: Casing, 26: First sub tank, 27: Second Sub tank, 28: communication pipe, 29, 30: check valve, 31: conduit pipe, 32: feed water thermistor, 33: pressure reducing valve, 34: heat pump unit, 35: boiling pump, 36: heat pump outgoing pipe, 37: heat pump Return pipe, 38: heat pump return three-way valve, 39: second heat pump return pipe, 40: accumulator tank, 41: connecting pipe, 42: first sub-reservoir tank, 43: second sub-reservoir 44: discharge valve, 45: solar three-way valve, 46: bypass path, 47: solar return thermistor, 48: second connecting pipe, 49: vent pipe, 50: hot water outlet pipe, 51: second hot water outlet, 52: Second hot water outlet pipe, 53: Solar mixing valve, 54: Hot water supply pipe, 55: Second water conduit pipe, 56: Hot water supply mixing valve, 57: Hot water supply pipe, 58, 59: Check valve, 60: Solar Hot water thermistor 61: Hot water thermistor 62: Bottom plate 65: Leg member 66: Partition wall 67: Support 68: Discharge port

Claims (4)

In a hot water supply apparatus having a hot water storage tank having a water supply port through which water flows into a bottom portion, a first hot water outlet for sending out hot water stored in a ceiling portion, and a casing having a rectangular cross section for housing the hot water storage tank ,
A solar heat collecting part for heating the heat medium outside the casing; a heat exchange part housed inside the bottom of the hot water storage tank; and a circulation pump for flowing the heat medium from the heat exchange part to the solar heat collection part A solar heating means having a forward piping provided and a heating medium circulation path provided with a return piping for flowing a heating medium from the solar heat collecting section to the heat exchanging section;
An accumulator tank that is provided in the forward pipe upstream of the circulation pump and temporarily stores the heat medium, and accepts the heat medium flowing out from the accumulator tank when the pressure of the heat medium in the accumulator tank rises; A reserve tank for supplying the heat medium to the accumulator tank when the pressure of the heat medium in the accumulator tank decreases, and the circulation pump are disposed in the casing, and the reserve tank is disposed at a rectangular angle in the casing. A hot water supply apparatus characterized by being arranged in a section. 2. The hot water storage apparatus according to claim 1, wherein the hot water storage tank includes a first sub tank in which the first hot water outlet is provided in a ceiling portion, and a hot water inlet through which hot water flows is provided in or around the ceiling portion, and the water supply. A second sub-tank in which a mouth is provided at the bottom and the heat exchanging portion is housed inside the bottom; a communication pipe connecting the lower portion of the first sub-tank and the upper portion of the second sub-tank; In addition, the first sub-tank and the second sub-tank are erected side by side on the bottom plate of the casing, and the reserve tank is arranged in a gap between the second sub-tank and the casing. . 3. The hot water supply apparatus according to claim 2, wherein the reserve tank includes first and second sub-reserve tanks having bottoms connected to each other, and the bottoms of the first and second sub-reserve tanks are connected via a connecting pipe. The first and second sub-reservation tanks are connected to the accumulation tank, and the first and second sub-reservation tanks are respectively disposed in two gaps formed between the casing and the second sub-tank. A hot water supply apparatus, wherein a heat medium discharge mechanism is provided at the bottom of the sub-reserve tank. 4. The hot water supply apparatus according to claim 3, wherein upper portions of the first and second sub-reserve tanks are connected via a second connecting pipe, and upper portions of the first and second sub-reserve tanks are connected to the second sub-reserve tank. A hot water supply apparatus characterized in that a vent pipe for opening the first and second sub-reserve tanks to the atmosphere is connected to one or both of the connecting pipes.

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