WO2008053819A1

WO2008053819A1 - Hot-water storage-type hot-water supply device

Info

Publication number: WO2008053819A1
Application number: PCT/JP2007/070990
Authority: WO
Inventors: Takeharu Ando; Shigeharu Taira
Original assignee: Daikin Industries, Ltd.
Priority date: 2006-10-31
Filing date: 2007-10-29
Publication date: 2008-05-08
Also published as: JP2008116065A

Abstract

A hot-water storage-type hot-water supply device in which the temperature of hot water in a tank is stabilized and in which hot-water run out is prevented. The hot-water supply device (1) stores water boiled by a heat pump unit (2) in the tank, supplies the hot water when required, and has a first tank (31) and a second tank (32). The second tank (32) has a greater internal volume than the first tank (31). Also, the first tank (31) receives water from the water source side. This minimizes mixing of the water from the water source side and the hot water to stabilize the temperature of the hot water in the second tank (32).

Description

Specification

Hot water storage water heater

Technical field

TECHNICAL FIELD [0001] The present invention relates to a hot water storage type hot water heater, and more particularly to a hot water storage type hot water heater using a heat pump as a means for heating water.

Background art

[0002] Conventionally, hot water storage hot water heaters have adopted hot water storage tanks that are always kept full with hot water boiled by a heat source and supplied water! The water supplied from the water source to the bottom of the hot water storage tank is heated by circulating between the hot water storage tank and the heat exchanger of the heat pump (see, for example, Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2005-345099

Disclosure of the invention

Problems to be solved by the invention

[0003] However, the hot water storage type water heater described in Patent Document 1 boils the entire amount at the same temperature up to the bottom of the hot water storage tank due to the heating control of the heat source even when the hot water is heated in the hot water storage tank. It cannot be raised and mixes with the supplied water, leaving an intermediate temperature layer below the middle of the tank. Therefore, the amount of heat that can be supplied in the tank is reduced by mixing the remaining hot water of the intermediate temperature layer and hot water of the high temperature layer. In addition, when boiling, the temperature of the water entering the heat pump's water heat exchanger rises, which reduces the coefficient of performance of the heat pump.

An object of the present invention is to provide a hot water storage type hot water heater that can stabilize the temperature of hot water in a tank and prevent the occurrence of hot water shortage.

Means for solving the problem

[0004] A hot water storage type hot water supply apparatus according to a first invention is a hot water storage type hot water supply apparatus that stores hot water boiled by a heating means in a tank, and supplies hot water as needed. The first tank and the second tank It is equipped with. The second tank has a larger internal volume than the first tank. In addition, it accepts water from either the first tank or the second tank, and water from the water source side.

In this hot water storage type water heater, a tank for receiving water on the water source side and a tank for storing hot water Are separated from each other. For this reason, mixing of water on the water source side with high-temperature hot water is suppressed, the hot water temperature in at least one tank is stabilized, and generation of an intermediate temperature layer is suppressed.

[0005] A hot water storage type hot water heater according to a second aspect of the present invention is the hot water storage type hot water supply apparatus according to the first aspect of the invention, wherein water on the water source side enters the heating means via the first tank. The water boiled by the heating means

Enter 2 tanks. When the entire hot water in the second tank has boiled up to the specified temperature, the heating operation by the heating means is completed.

In this hot water storage type hot water heater, since low temperature water does not enter the second tank directly, the hot water temperature in the second tank is stabilized and the generation of an intermediate temperature layer is suppressed.

[0006] A hot water storage type hot water heater according to a third aspect of the present invention is the hot water storage type hot water supply apparatus according to the first aspect of the present invention, which is a heat pump with a heating step force S and a refrigerant compression refrigeration cycle.

In this hot water storage type water heater, the temperature power of the water entering the heat pump is almost equal to the water on the water source side. For this reason, the temperature of the water entering the heat pump is kept low, and the coefficient of performance during boiling operation is improved.

[0007] A hot water storage type hot water heater according to a fourth aspect of the present invention is the hot water storage type hot water supply apparatus according to the first aspect of the invention, wherein water on the water source side enters the heating means via the second tank. Hot water boiled by the heating means enters the first tank.

In this hot water storage water heater, the first tank with a small capacity is filled with hot water as soon as hot water is replenished, preventing hot water from running out.

[0008] A hot water storage type water heater according to a fifth aspect of the invention is the hot water storage type hot water supply apparatus according to the fourth aspect of the invention, wherein hot water boiled by the heating means flows into either the first tank or the second tank. The first three-way valve is further provided. When the hot water boiled by the heating means is poured into the first tank, the first three-way valve is boiled by the heating means when the first tank is filled with hot water of a predetermined temperature. Let the hot water flow into the second tank.

In this hot water storage type water heater, the amount and temperature of hot water stored in the second tank and the amount and temperature of hot water stored in the first tank are individually adjusted. For this reason, the amount of hot water stored in each tank is widely adjusted according to the hot water supply conditions required by the user, which is convenient and reduces running costs. [0009] A hot water storage type water heater according to a sixth aspect of the present invention is the hot water storage type hot water supply apparatus according to the fifth aspect of the present invention, wherein a flow path is provided for taking out hot water from one of the first tank and the second tank during hot water supply. A second three-way valve is also provided.

In this hot water storage type water heater, the tank is selected according to the hot water supply load and the hot water supply temperature, so that the hot water supply is performed efficiently.

[0010] A hot water storage type water heater according to a seventh aspect of the present invention is the hot water storage type hot water supply apparatus according to the first aspect of the invention, wherein an external heat exchanger is configured to exchange heat between the second tank of hot water and an external load. Is further provided. The hot water in the second tank returns to the second tank again via the external heat exchanger.

In this hot water storage type water heater, the heat capacity is large! / The second tank side is the heat source for heat exchange with the external load, so the first tank is less affected by heat exchange with the external load. The temperature in the tank is stable.

[0011] A hot water storage type hot water heater according to the eighth invention is the hot water storage type hot water supply apparatus according to the seventh invention, wherein the hot water storage type heat exchanger exchanges heat with the hot water of the external heat exchanger. is there,

In this hot water storage type water heater, the second tank side with a large heat capacity serves as a heat source for replenishment. Therefore, the temperature in the first tank is stabilized without the thermal effect on the first tank side due to replenishment.

[0012] A hot water storage type hot water supply apparatus according to a ninth aspect of the invention is the hot water storage type hot water supply apparatus according to the first aspect of the invention, further comprising a case for housing the first tank and the second tank. The first tank is placed in the space formed by one corner and the second tank in the case.

In this hot water storage type hot water heater, space is effectively used, so that space is saved.

[0013] A hot water storage type hot water supply apparatus according to a tenth aspect of the invention is the hot water storage type hot water supply apparatus according to the first aspect of the invention, further comprising a case for housing the first tank and the second tank. Various devices are arranged in a space formed by the case, the first tank, and the second tank.

In this hot water storage type hot water heater, space is effectively used, so that space is saved. The invention's effect

[0014] In the hot water storage type hot water supply apparatus according to the first aspect of the invention, the tank for receiving water on the water source side and the tank for storing high temperature hot water are separated from each other, so that the water on the water source side and the hot water are mixed. The temperature of the hot water in at least one tank is stabilized.

In the hot water storage type water heater according to the second invention, since low temperature water does not enter the second tank directly, 2 The water temperature in the tank is stable.

In the hot water storage type hot water heater according to the third invention, the temperature of the water entering the heat pump is substantially equal to the water on the water source side, so the temperature of the water entering the heat pump is kept low, and the coefficient of performance during the boiling operation is improved. .

In the hot water storage type water heater according to the fourth invention, the capacity is small! / When the first tank is replenished with hot water, the hot water is immediately filled with hot water. The

[0015] In the hot water storage type water heater according to the fifth invention, the amount and temperature of hot water stored in the second tank and the amount and temperature of hot water stored in the first tank are individually adjusted, so that the user The amount of hot water stored in each tank is adjusted according to the required hot water supply conditions.

In the hot water storage type hot water supply apparatus according to the sixth aspect of the invention, since the tank is selected according to the hot water supply load and the hot water supply temperature, the hot water supply is efficiently performed.

In the hot water storage type hot water heater according to the seventh aspect of the invention, the heat capacity is large! /, And the second tank side is a heat source for heat exchange with the external load, so the thermal effect on the first tank side due to heat exchange with the external load is The temperature in the first tank is stable.

In the hot water storage type water heater according to the eighth aspect of the invention, since the heat capacity is large and the second tank side is a heat source for the memorial, the temperature in the first tank at which the memorial heat does not affect the first tank side is Stabilize

[0016] In the hot water storage type hot water heater according to the ninth and tenth inventions, the space is effectively used, so that the space is saved.

Brief Description of Drawings

[FIG. 1] A hot-water storage water heater system according to a first embodiment of the present invention.

FIG. 2 shows a hot water storage hot water supply system according to a second embodiment of the present invention.

[Fig. 3] (a) Layout of each tank with vertical upward force when the capacity ratio of large capacity tank to small capacity tank is 9: 1. (B) The layout of each tank as viewed from the vertical upward force when the capacity ratio between the large capacity tank and the small capacity tank is 8: 2.

[Fig. 4] (a) Layout of each tank with vertical upward force when large capacity tanks are prismatic. (b) The layout of each tank as seen from vertically above when the small-capacity tank is in the shape of a prism.

Explanation of symbols [0018] 1, 101 Hot-water storage water heater

2 Heat pump unit

31, 131 Small capacity tank (first tank)

32, 132 Large capacity tank (second tank)

41, 141 memory heat exchanger

82 1st 3-way valve

83 Second three-way valve

190 cases

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment]

FIG. 1 shows a hot water storage type hot water supply system according to a first embodiment of the present invention. A hot water storage type hot water supply machine 1 includes a heat pump unit 2 and a hot water storage device 3.

(Heat pump unit)

The heat pump unit 2 includes a compressor 21, a refrigerant pipe 22 a in the water heat exchanger 22, an expansion valve 23 as a decompression means, and an air heat exchanger 24 connected in a ring shape by a refrigerant pipe 25. Refrigerant compression type The refrigeration circuit 20 is provided.

Further, the refrigeration circuit 20 is provided with a gas heat exchanger 26 for heat exchange between the high-pressure and high-temperature refrigerant coming out of the water heat exchanger 22 and the low-pressure and low-temperature refrigerant coming out of the air heat exchanger 24. ing. Specifically, heat exchange is performed between the refrigerant passage connecting the water heat exchanger 22 and the expansion valve 23 and the refrigerant passage connecting the air heat exchanger 24 and the compressor 21.

[0020] (Hot water storage device)

The hot water storage device 3 includes a water circulation circuit 30, a hot water circulation circuit 40, a memory circulation circuit 50, a water supply pipe 61, a hot water supply pipe 71, and a hot water supply mixing valve 81. The water circulation circuit 30 includes a first tank 31 having a small internal volume (hereinafter referred to as a small-capacity tank 31), a water circulation pump 33, a water pipe 22b in the water heat exchanger 22, and a second tank 32 having a large internal volume. (Hereinafter referred to as the large-capacity tank 32) and the 1S water pipe 35 are connected in a ring shape.

The hot water circulation circuit 40 includes a large capacity tank 32, a first hot water pipe 41a in the remedy heat exchanger 41, and a first A hot water circulation pump 42 is annularly connected by a first hot water pipe 43. In the memorial circuit 50, the second hot water pipe 41b of the memorial heat exchanger 41, the second hot water circulation pump 52, and a bath (not shown) are connected in a ring shape by a second hot water pipe 53. . In this embodiment, the volume ratio between the small capacity tank 31 and the large capacity tank 32 is set to 1: 9 to 2: 8, and the total volume is 420 liters. However, the volume ratio and the total volume are not limited thereto.

The water supply pipe 61 exits from a water source (not shown) and is connected to the bottom of the small capacity tank 31.

The hot water supply pipe 71 exits from the head of the large capacity tank 32 and is connected to the hot water supply mixing valve 81. The water supply branch 6 l a branches from the middle of the water supply pipe 61 and is connected to the hot water supply mixing valve 81.

(Water and hot water circulation)

Water from the water source is supplied from the bottom of the small capacity tank 31 through the water supply pipe 61 to the inside. The water in the small capacity tank 31 is sent to the heat pump unit 2 by the water circulation pump 33 and heated by the water heat exchanger 22. The heated water is sent to the large-capacity tank 32 and stored as hot water. The hot water in the large-capacity tank 32 circulates in the hot water circulation circuit 40 and exchanges heat with the bath water circulating in the hot water circulation circuit 50 in the hot water heat exchanger 41.

In this embodiment, the memorial heat exchanger 41 is set to exchange heat with the hot water in the bath, but is not limited to this, for example, hot water for floor heating or the like. It may be set up to exchange heat with the load.

[0022] Hot water used by the user enters the hot water supply mixing valve 81 from the head of the large capacity tank 32 through the hot water supply pipe 71, where it is mixed with water, adjusted to an appropriate temperature, and supplied to the user.

When the amount of hot water in the large-capacity tank 32 is reduced, water is replenished from the small-capacity tank 31. However, the temperature of the hot water is less reduced compared to the type in which the water from the water source is directly supplied.

On the other hand, the water sent to the heat pump unit 2 is water in the small capacity tank 31 and is isolated from the hot water in the large capacity tank 32, so that the water temperature is stable. Therefore, the temperature of the water entering the water heat exchanger 22 is lower than that of a type that sends hot water in an intermediate temperature layer in which hot water and water from the water source are mixed. As a result, the amount of heat exchange with the refrigerant increases, and the coefficient of performance during the heating operation of the heat pump unit 2 improves.

In particular, in the heat pump unit using C02 refrigerant, the rate of decrease in coefficient of performance S when the temperature of the water entering the water heat exchanger 22 is high, compared to the heat pump unit using R410A. Since it is large, keeping the temperature of the water entering the water heat exchanger 22 low is important for realizing energy saving.

[0023] In the case of R410A, the refrigerant condenses in the water heat exchanger 22, so that the temperature distribution of the refrigerant becomes almost uniform, and heat is exchanged almost uniformly in the entire area of the water heat exchanger 22. For this reason, the temperature of the water entering the water heat exchanger 22 is high! /, And even when the coefficient of decrease is relatively small! /.

On the other hand, in the case of C02 refrigerant, since the refrigerant is in a supercritical state on the high pressure side, the refrigerant does not condense, and the water temperature decreases as the refrigerant approaches the refrigerant outlet side from the refrigerant inlet side of the water heat exchanger 22. When the temperature of water entering 22 is high, heat exchange at the refrigerant outlet side region is insufficient. Therefore, the rate of decrease of the coefficient of performance when the temperature of the water entering the water heat exchanger 22 is high is larger than that of the heat pump unit using R4 10A. Therefore, the present embodiment in which the temperature of the water entering the hydrothermal exchanger 22 is kept low is suitable for a heat pump unit using a C02 refrigerant.

(1)

In the hot water storage type water heater 1, water on the water source side enters the heat pump unit 2 via the small capacity tank 31, and the hot water boiled there enters the large capacity tank 32. When the entire hot water in the large-capacity tank 32 has boiled to a predetermined temperature, the heating operation by the heat pump unit 2 ends. In this hot water storage type water heater 1, since the low temperature water does not enter the second tank directly, the hot water temperature in the second tank is stabilized.

(2)

In this hot water storage type water heater 1, the temperature of the water entering the water heat exchanger 22 of the heat pump unit 2 is kept low, and the coefficient of performance during the boiling operation is improved.

[Second Embodiment]

FIG. 2 shows a hot water storage hot water system according to the second embodiment of the present invention. The hot water storage type hot water supply apparatus 101 is composed of a heat pump unit 2 and a hot water storage device 103. Since the heat pump unit 2 is the same as that of the first embodiment, a description thereof will be omitted, and the hot water storage device 103 will be described with reference to FIG. (Hot water storage device)

The hot water storage device 103 includes a water circulation circuit 130, a hot water circulation circuit 140, a memory circulation circuit 150, a water supply pipe 161, a hot water supply pipe 171, and a hot water supply mixing valve 81. The water circulation circuit 130 includes a second tank 132 having a large internal volume (hereinafter referred to as a large-capacity tank 132), a water circulation pump 133, a water pipe 22b in the water heat exchanger 22, and a first tank 131 having a small internal volume. (Hereinafter referred to as the small capacity tank 131) and the hydrostatic pipe 135 are connected in a ring shape. The water that has exited the water heat exchanger 22 is sent to either the large-capacity tank 132 or the small-capacity tank 131 by the first three-way valve 82. In the present embodiment, the volume ratio between the small capacity tank 131 and the large capacity tank 132 is set to 1: 9 to 2: 8, and the total volume is 420 liters. However, the volume ratio and total volume are not limited to this.

[0026] The hot water circulation circuit 140 includes a large-capacity tank 132, a first hot water pipe 141a in the additional heat exchanger 141, and a first hot water circulation pump 142 connected in a ring shape by a first hot water pipe 143. Yes. In the remedy circulation circuit 150, the second hot water pipe 141b of the remedy heat exchanger 141, the second hot water circulation pump 152, and a bath (not shown) are connected in a ring shape by a second hot water pipe 153. .

In this embodiment, the memorial heat exchanger 141 is configured to exchange heat with bath water, but is not limited to this. For example, hot water for floor heating is used. It may be set to exchange heat with the load.

The water supply pipe 161 exits from the water source (not shown) and is connected to the bottom of the large capacity tank 132. The hot water supply pipe 171 exits from the head of the large capacity tank 132 and the head of the small capacity tank 131 and is connected to the second three-way valve 83 to enter the hot water mixing valve 81. The water supply branch pipe 161 a branches from the middle of the water supply pipe 161 and is connected to the hot water supply mixing valve 81.

[0027] (Water and hot water circulation)

Water from the water source is supplied from the bottom of the large capacity tank 132 through the water supply pipe 161 to the inside. The water in the large-capacity tank 132 is sent to the heat pump unit 2 by the water circulation pump 133 and heated by the water heat exchanger 22. The heated water is sent to the small capacity tank 131 through the first three-way valve 82 and stored as hot water. However, when the small-capacity tank 131 is filled with hot water of a predetermined temperature, the flow path is switched by the first three-way valve 82, and the heated water is sent to the large-capacity tank 132. When the amount of hot water in the small capacity tank 131 decreases, Hot water is replenished. Therefore, hot water is always stored in the small capacity tank 131. The hot water in the large-capacity tank 132 circulates in the hot water circulation circuit 140 and exchanges heat with the bath water circulating in the additional heat circulation circuit 150 in the additional heat exchanger 141.

[0028] Hot water used by the user is supplied from either the large capacity tank 132 or the small capacity tank 131 via the second three-way valve 83. That is, the second three-way valve 83 selects either one of the small capacity tank 131 and the large capacity tank 132 according to the hot water supply load and the hot water supply temperature.

Next, a method for arranging each tank will be described using the second embodiment. This arrangement method can be applied not only to the second embodiment but also to the first embodiment.

Fig. 3 (a) is a layout view of each tank as seen from above, where the capacity ratio between the large capacity tank and the small capacity tank is 9: 1. Fig. 3 (b) is a layout view of each tank as seen from above, where the capacity ratio between the large capacity tank and the small capacity tank is 8: 2.

As shown in Fig. 3 (a) and (b), the large-capacity tank 132 is disposed near the corner of the case 190 of the hot water storage device 103, thereby forming an invalid space between the large-capacity tank 132 and the corner. Is done. A small-capacity tank 131 is arranged in this invalid space. Various devices 195 are arranged in an invalid space formed by the small-capacity tank 131, the large-capacity tank 132, and the case 190.

[0029] Fig. 4 (a) is an arrangement diagram of each tank as viewed from above in the case where the large-capacity tank is formed in a prismatic shape. Fig. 4 (b) is a layout of each tank as seen from above in the case where the small capacity tanks are prismatic.

As shown in Fig. 4 (a) and (b), the small tank 131 or the large tank 132 is formed in a prismatic shape, so that the corner of the tank and the corner of the case 190 can be approached. . As a result, the invalid space is reduced and the case 190 is saved. Further, it is possible to further increase the capacity of the tank by the volume corresponding to the conventional invalid space without changing the size of the case 190.

In the present embodiment, either the small-capacity tank 131 or the large-capacity tank 132 may be formed in a prismatic shape, or both the small-capacity tank 131 and the large-capacity tank 132 may be formed in a prismatic shape. . The corner in the case 190 and the small-capacity tank 131 and Ineffective space is further reduced by bringing the corner of the large capacity tank 132 as close as possible.

[0030] The shapes of the small-capacity tank 131 and the large-capacity tank 132 are not limited to the shapes shown in the present embodiment, and can be changed without departing from the scope of the invention.

(1)

In this hot water storage type water heater 101, water on the water source side enters the heat pump unit 2 via the large capacity tank 132, and the hot water boiled there enters the small capacity tank 131. When hot water is replenished to the small-capacity tank 131 with a small internal volume, it is immediately filled with hot water, preventing hot water from running out.

(2)

In this hot water storage type water heater 101, a first three-way valve 82 that allows boiling water to flow into one of a small capacity tank 131 and a large capacity tank 132, and a small capacity tank 131 and a large capacity tank 132 during hot water supply. And a second three-way valve 83 for switching the flow path in order to take out hot water from any one of the above. For this reason, the amount of hot water stored in each tank is adjusted according to the hot water supply situation required by the user, and the tank is selected according to the hot water supply load and the hot water supply temperature, so that hot water can be supplied efficiently.

[0031] (3)

In this hot water storage type water heater 101, the large-capacity tank 132 side having a large heat capacity is used as a heat source for replenishment, so the temperature in the small-capacity tank 131 is stabilized without the thermal effect on the small-capacity tank 131 side due to retreat. .

(Four)

In this hot water storage type water heater 101, a small capacity tank 131 is disposed in a space formed by one corner in the case 190 and the large capacity tank 132. Various devices 195 are arranged in a space formed by the case 190, the small capacity tank 131, and the large capacity tank 132. In this way, space is effectively used, so that space is saved.

(Five)

This hot water storage type water heater 101 has at least a small capacity tank 131 and a large capacity tank 132. One of them is formed in a prismatic shape, and the ineffective space is reduced by bringing the corner in the case 190 and the corner of the tank as close as possible. For this reason, it is possible to reduce the size of the case and enlarge the tank side.

Industrial applicability

As described above, the present invention can always store hot water at a stable temperature in a tank of a hot water storage device, and thus is useful for all hot water storage water heaters such as a heat pump hot water heater.

Claims

The scope of the claims

A hot water heater that stores hot water boiled by the heating means (2) in a tank and supplies hot water as needed.

The first tank (31, 131),

A second tank (32, 132) having a larger internal volume than the first tank (31, 131),

One of the first tank (31, 131) and the second tank (32, 132) receives water from the water source side,

Hot water storage water heater (1, 101).

Water on the water source side enters the heating means (2) via the first tank (31), the hot water boiled by the heating means (2) enters the second tank (32),

When the entire hot water of the second tank (32) is boiled to a predetermined temperature, the heating means (

The boiling operation by 2) is finished,

Hot water storage type water heater according to claim 1 (D o

The hot water storage type water heater (D o) according to claim 1, wherein the heating means (2) is a heat pump using 1S and a refrigerant compression refrigeration cycle.

Water on the water source side enters the heating means (2) via the second tank (132), and the hot water boiled by the heating means (2) enters the first tank (131). The hot water storage type water heater (101) according to claim 1.

A first three-way valve (82) that allows hot water boiled by the heating means (2) to flow into one of the first tank (131) and the second tank (132);

When the hot water boiled by the heating means (2) flows into the first tank (131) and the inside of the first tank (131) is filled with hot water of a predetermined temperature , The first three-way valve (

The hot water storage type hot water supply device (101) according to claim 4, wherein 82) causes the hot water boiled by the heating means (2) to flow into the second tank (132).

A second three-way valve (83) for switching the flow path for removing hot water from either the first tank (131) or the second tank (132) during hot water supply; The hot water storage type water heater (101) according to claim 5.

An external heat exchanger that exchanges heat between the hot water in the second tank (32, 132) and an external load;

The hot water in the second tank (32, 132) returns to the second tank (32, 132) again via the external heat exchanger.

The hot water storage type water heater (1, 101) according to claim 1.

The external heat exchanger is a memorial heat exchanger (41, 1 41) for exchanging heat with bath water.

The hot water storage type water heater according to claim 7 (1, 101)

A case (190) for storing the first tank (131) and the second tank (132);

The first tank (131) is disposed in a space formed by one corner in the case (190) and the second tank (132).

The hot water storage type water heater (101) according to claim 1.

A case (190) for storing the first tank (131) and the second tank (132);

Various devices (195) are disposed in a space formed by the case (190), the first tank (131), and the second tank (132).

The hot water storage type water heater (101) according to claim 1.