JP4421525B2 - Water heater - Google Patents

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JP4421525B2
JP4421525B2 JP2005192396A JP2005192396A JP4421525B2 JP 4421525 B2 JP4421525 B2 JP 4421525B2 JP 2005192396 A JP2005192396 A JP 2005192396A JP 2005192396 A JP2005192396 A JP 2005192396A JP 4421525 B2 JP4421525 B2 JP 4421525B2
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water supply
hot water
strainer
water
heat exchanger
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JP2007010241A (en
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邦男 酒井
光男 村野
亮 小長井
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Toshiba Carrier Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/12—Hot water central heating systems using heat pumps

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Description

本発明は給湯装置に係り、特に配管装置を改良した給湯装置に関する。   The present invention relates to a hot water supply device, and more particularly, to a hot water supply device having an improved piping device.

近年、給湯装置としてヒートポンプ式給湯装置が多く用いられているが、従来の給湯装置に用いられる配管装置５１は、図７に示すＹ形配管装置、図８に示すＵ形配管装置とも、水の入口側配管接続部５４と出口側配管接続部５５が一直線に配置され、配管装置５１内のストレーナ５７を通水させるために、ストレーナ５７の内部で屈曲させ、さらにストレーナ５７の出口で再度屈曲させているため、流水時の圧力損失が大きい。またストレーナの取出口も水の流れ方向に沿っているため製品形態によっては、メンテナンスに支障をきたす場合があった。また、水熱交換器内のエアあるいは水抜き用のドレン栓は、配管装置とは別個に設けられているので、給湯装置の前面パネルを外さなければ作業ができないなどの問題があった。   In recent years, a heat pump type hot water supply device is often used as a hot water supply device, but the piping device 51 used in the conventional hot water supply device includes both a Y-shaped piping device shown in FIG. 7 and a U-shaped piping device shown in FIG. The inlet side pipe connection part 54 and the outlet side pipe connection part 55 are arranged in a straight line, and are bent inside the strainer 57 and then bent again at the outlet of the strainer 57 in order to allow the strainer 57 in the piping device 51 to pass through. Therefore, the pressure loss during running water is large. In addition, since the outlet of the strainer is also along the direction of water flow, depending on the product form, maintenance may be hindered. Further, since the drain plug for air or drainage in the water heat exchanger is provided separately from the piping device, there is a problem that the operation cannot be performed unless the front panel of the hot water supply device is removed.

また、従来の配管装置は内部で屈曲しているため、製造時内部の切削加工は困難であり、鋳物製造によらなければならず、配管装置内に巣ができ易く、巣より水漏れの可能性もあるため、検査工程が重要で部品不良率も高い問題があった。   In addition, since the conventional piping device is bent internally, it is difficult to cut inside the manufacturing process, it must be based on casting production, a nest is easily formed in the piping device, and water can leak from the nest. Therefore, there is a problem that the inspection process is important and the component defect rate is high.

なお、直角に分岐する分岐管にストレーナを内装した配管装置が特許文献１に提案されている。
特開２０００−１０４２９９号公報 In addition, Patent Document 1 proposes a piping device in which a strainer is built in a branch pipe that branches at a right angle.
JP 2000-104299 A

本発明は上述した事情を考慮してなされたもので、流水抵抗が小さく、水熱交換器内のエア抜き、水抜きの際の作業等が容易でストレーナのメンテナンスが容易かつ、安価で小型な配管装置を備えた給湯装置を提供することを目的とする。   The present invention has been made in consideration of the above-mentioned circumstances, has a low resistance to flowing water, easy air removal in the water heat exchanger, easy operation during drainage, etc., easy maintenance of the strainer, low cost and small size. It aims at providing the hot-water supply apparatus provided with the piping apparatus.

上述した目的を達成するため、本発明に係る給湯装置は、給湯装置筐体と、この給湯装置筐体に設けられた水熱交換器と、外部からこの水熱交換器に給水する水配管に設けられた配管装置等を備えた給湯装置において、前記配管装置の入口側配管接続部と出口側配管接続部は、この両配管接続部を連通する通水路を設けることにより、前記両配管接続部の中心軸をずらして設けられ、前記通水路にはストレーナが設けられ、前記入口側配管接続部と前記出口側配管接続部は各々の中心軸が平行になるようにずらされ、前記通水路は前記両中心軸に直交するように設けられ、前記ストレーナは前記通水路に着脱可能に設けられ、前記ストレーナを前記通水路内に固定するストレーナキャップに、前記通水路からドレンを抜くためのドレン栓が着脱可能に設けられたことを特徴とする。 In order to achieve the above-described object, a hot water supply apparatus according to the present invention includes a hot water supply apparatus casing, a water heat exchanger provided in the hot water supply apparatus casing, and a water pipe for supplying water to the water heat exchanger from the outside. In the hot water supply apparatus provided with a provided piping device or the like, the inlet-side pipe connecting portion and the outlet-side pipe connecting portion of the piping device are provided with a water passage that communicates both the pipe connecting portions. The strain passage is provided in the water passage, the inlet side pipe connection portion and the outlet side pipe connection portion are shifted so that the respective central axes are parallel, and the water passage is A drain plug for removing drain from the water passage is provided on a strainer cap that is provided so as to be orthogonal to both the central axes, the strainer is detachably provided in the water passage, and fixes the strainer in the water passage. Wear Characterized in that it has been possible provided.

本発明に係る配管装置によれば、流水抵抗が小さく、水熱交換器内のエア抜き、水抜きの際の作業等が容易でストレーナのメンテナンスが容易かつ、安価で小型な配管装置を備えた給湯装置を提供することができる。   According to the piping device of the present invention, the flow resistance is small, the air in the water heat exchanger is easily evacuated, the operation at the time of draining is easy, the strainer maintenance is easy, and the inexpensive and small piping device is provided. A hot water supply apparatus can be provided.

以下、本発明に係る給湯装置の一実施形態としてのヒートポンプ式給湯装置について添付図面を参照して説明する。   Hereinafter, a heat pump type hot water supply apparatus as an embodiment of a hot water supply apparatus according to the present invention will be described with reference to the accompanying drawings.

図１は本発明のヒートポンプ式給湯装置の冷凍サイクル系統図、図２は本発明に係る給湯装置の本体カバーを除去して示す斜視図である。   FIG. 1 is a refrigeration cycle diagram of the heat pump type hot water supply apparatus of the present invention, and FIG. 2 is a perspective view showing the main body cover of the hot water supply apparatus according to the present invention removed.

図１に示すように、ヒートポンプ式冷凍サイクル回路Ｈは、本発明に係る水熱交換器を収納した給湯装置１と熱源ユニット２１に構成されている。   As shown in FIG. 1, the heat pump refrigeration cycle circuit H is constituted by a hot water supply device 1 and a heat source unit 21 that house a water heat exchanger according to the present invention.

この熱源ユニット２１は圧縮機２２と、第１の水熱交換器である給湯用熱交換器２３およびこの給湯用水熱交換器２３と並列に配管された第２の水熱交換器である暖房用熱交換器２４と、電子膨張弁（減圧機構）２５と、送風機２６ａを備えた熱源側熱交換器２６が冷媒配管２７を介して連通されている。圧縮機２２、電子膨張弁２５、熱源側熱交換器２６は熱源ユニット２１の熱源ユニット筐体２１Ａ内に収容され、給湯用熱交換器２３および暖房用熱交換器２４は給湯装置１の給湯装置筐体１Ａ内に収容されている。   The heat source unit 21 includes a compressor 22, a hot water supply heat exchanger 23 that is a first water heat exchanger, and a second water heat exchanger that is piped in parallel with the hot water supply water heat exchanger 23. A heat source 24, an electronic expansion valve (decompression mechanism) 25, and a heat source side heat exchanger 26 including a blower 26 a are communicated with each other via a refrigerant pipe 27. The compressor 22, the electronic expansion valve 25, and the heat source side heat exchanger 26 are accommodated in the heat source unit housing 21 </ b> A of the heat source unit 21, and the hot water supply heat exchanger 23 and the heating heat exchanger 24 are the hot water supply device of the hot water supply device 1. It is accommodated in the housing 1A.

給湯用熱交換器２３および暖房用熱交換器２４とも給湯用水配管２８、暖房用水配管２９に接続する水熱交換部を備え、冷凍サイクル回路Hに接続される冷媒熱交換部と有効な熱交換作用をなすように構成されている。   Both the hot water supply heat exchanger 23 and the heating heat exchanger 24 include a water heat exchange unit connected to the hot water supply water pipe 28 and the heating water pipe 29, and effective heat exchange with the refrigerant heat exchange unit connected to the refrigeration cycle circuit H. It is comprised so that an effect | action may be made.

また、給湯用水配管２８、暖房用水配管２９には、給湯用ポンプ３０、暖房用ポンプ３１が設けられており、給湯用ポンプ３０と給湯用熱交換器２３は給湯用水配管２８を介して給湯用タンクユニットを構成する給湯用タンク３２と連通され、暖房用ポンプ３１と暖房用熱交換器２４は暖房用水配管２９を介して暖房用タンクユニットを構成する暖房用タンク３３と連通されている。なお、給湯用タンクユニット３２と暖房用タンクユニット３４でタンクユニット３４が構成されている。   Further, the hot water supply water pipe 28 and the heating water pipe 29 are provided with a hot water supply pump 30 and a heating pump 31, and the hot water supply pump 30 and the hot water supply heat exchanger 23 are used for hot water supply via the hot water supply water pipe 28. The hot water supply tank 32 constituting the tank unit is communicated with, and the heating pump 31 and the heating heat exchanger 24 are communicated with the heating tank 33 constituting the heating tank unit via the heating water pipe 29. The hot water supply tank unit 32 and the heating tank unit 34 constitute a tank unit 34.

図２に示すように、本発明に係る給湯装置１は、カバー（図示せず）を備えた給湯装置筐体１Ａの上部に給湯用熱交換器２３が収容され、給湯装置筐体１Ａ内下部に設けられた取付板１ａには、上記のように給湯用熱交換器２３に給湯用水配管２８を介して給水する給湯用ポンプ３０が載置され、さらに、暖房用熱交換器２４が載置され、また、この暖房用熱交換器２４に暖房用水配管２９を介して給水する給湯用ポンプ３１が載置されている。なお、図１中、符号３５は四方切換弁であり、符号３６〜３９は開閉弁である。   As shown in FIG. 2, a hot water supply apparatus 1 according to the present invention has a hot water supply heat exchanger 23 housed in an upper part of a hot water supply apparatus casing 1A provided with a cover (not shown), and a lower part in the hot water supply apparatus casing 1A. The hot water supply pump 30 for supplying water to the hot water supply heat exchanger 23 through the hot water supply water pipe 28 as described above is mounted on the mounting plate 1a provided on the mounting plate 1a, and further, the heating heat exchanger 24 is mounted. In addition, a hot water supply pump 31 for supplying water via the heating water pipe 29 is placed on the heating heat exchanger 24. In FIG. 1, reference numeral 35 denotes a four-way switching valve, and reference numerals 36 to 39 denote on-off valves.

さらに、図２及び図３に示すように、取付板１ａの下面には、給湯用水配管２８及び暖房用水配管２９に設けられた配管装置２が外部に露出するように取り付けられ、また、配管装置２と反対側（給水出口側）に設けられる水配管ジョイント４０、冷媒配管ジョイント４１が外部に露出するように取り付けられている。   Further, as shown in FIGS. 2 and 3, the piping device 2 provided in the hot water supply water pipe 28 and the heating water piping 29 is attached to the lower surface of the mounting plate 1a so as to be exposed to the outside. The water pipe joint 40 and the refrigerant pipe joint 41 provided on the opposite side (water supply outlet side) to 2 are attached so as to be exposed to the outside.

図４及び図５に示すように、配管装置２は配管装置本体３を有し、この配管装置本体３には入口側配管接続部４と出口側配管接続部５と、この両配管接続部４、５を連通する通水路６が設けられており、両配管接続部４、５の中心軸ｃ１、ｃ２をずらして、例えば各々の中心軸ｃ１、ｃ２が平行になるようずらして設けられ、通水路６は両中心軸ｃ１、ｃ２に直交するように設けられている。   As shown in FIGS. 4 and 5, the piping device 2 has a piping device main body 3, and the piping device main body 3 includes an inlet-side pipe connecting portion 4, an outlet-side piping connecting portion 5, and both the pipe connecting portions 4. 5 is provided, and the center axes c1 and c2 of the two pipe connecting portions 4 and 5 are shifted so that, for example, the center axes c1 and c2 are shifted in parallel to each other. The water channel 6 is provided so as to be orthogonal to both the central axes c1 and c2.

従って、入口側配管接続部４及び出口側配管接続部５に接続された給湯用水配管２８及び暖房用水配管２９の給湯用入口側水配管２８ａ及び暖房用入口側水配管２９ａから流入する給水は、直角に流路を変えられて通水路６に流入し、さらに、この通水路６で直角に流路を変えられて給湯用出口側水配管２８ｂ及び暖房用出口側水配管２９ｂから流出するようになっている。   Accordingly, the water supply flowing in from the hot water supply inlet water pipe 28a and the heating inlet water pipe 29a of the hot water supply water pipe 28 and the heating water pipe 29 connected to the inlet side pipe connection 4 and the outlet side pipe connection 5 is: The flow path is changed to a right angle and flows into the water passage 6, and further, the flow path is changed to a right angle in the water flow path 6 so as to flow out of the hot water supply outlet side water pipe 28 b and the heating outlet side water pipe 29 b. It has become.

図５及び図６に示すように、通水路６にはゴミ収集手段としてのストレーナ７が着脱可能に収容されている。このストレーナ７は円筒網状をなし、通水路６に収容された状態で、ストレーナキャップ８により固定されている。ストレーナキャップ８は通水路６の端部に設けられたストレーナ取出口９にＯリング１０を介して水密的かつ着脱可能に嵌合され、さらに、ストレーナキャップ８の反嵌合側には通水路６からドレンを抜くためのドレン栓１１が栓用Ｏリング１２を介して着脱可能に螺合されている。   As shown in FIGS. 5 and 6, a strainer 7 as dust collecting means is detachably accommodated in the water passage 6. The strainer 7 has a cylindrical mesh shape and is fixed by a strainer cap 8 while being accommodated in the water passage 6. The strainer cap 8 is fitted to a strainer outlet 9 provided at the end of the water passage 6 in a watertight and detachable manner via an O-ring 10, and the water passage 6 is provided on the non-fitting side of the strainer cap 8. A drain plug 11 for removing the drain from the plug is detachably screwed through a plug O-ring 12.

上述のような構造を有する本実施形態に係る給湯装置において、図１及び図５に示すように、給湯用入口側水配管２８ａ及び暖房用入口側水配管２９ａを介して配管装置２に流入する給水は、通水部６に収容されたストレーナ７によって給水に含まれるゴミが除去され、給湯用出口側水配管２８ｂ及び暖房用出口側水配管２９ｂ、給湯用ポンプ３０、暖房用ポンプ３１を介して給湯用熱交換器２３および暖房用熱交換器２４に給水され、加熱される。   In the hot water supply apparatus according to the present embodiment having the above-described structure, as shown in FIGS. 1 and 5, the hot water supply side water pipe 28a and the heating inlet side water pipe 29a flow into the piping apparatus 2. As for the water supply, dust contained in the water supply is removed by the strainer 7 accommodated in the water passage section 6, and the hot water supply outlet side water pipe 28 b and the heating outlet side water pipe 29 b, the hot water supply pump 30 and the heating pump 31 are passed through. The hot water supply heat exchanger 23 and the heating heat exchanger 24 are supplied with water and heated.

このストレーナ７によるゴミ除去過程において、両配管接続部４、５の中心軸ｃ１、ｃ２と直交するように通水路６を設けて、中心軸ｃ１、ｃ２を平行にずらし、通水路６にストレーナ７を収容したので、流水抵抗を最小限にすることができる。   In the dust removal process by the strainer 7, the water passage 6 is provided so as to be orthogonal to the central axes c 1 and c 2 of the pipe connecting portions 4 and 5, the central axes c 1 and c 2 are shifted in parallel, and the strainer 7 is placed in the water passage 6. Since water is accommodated, running water resistance can be minimized.

また、長時間使用し、ストレーナ７のメンテナンスを行うときには、両水配管２８、２９と直交するようにストレーナ７が通水部６に収容されているので、両水配管２８、２９が邪魔になることなく、ストレーナ取出口１０からストレーナ７を取り出してメンテナンスを容易に行うことができる。さらに、給湯装置１の据付時、両熱交換器３３、３４のエア抜き、あるいは長期間未使用時、修理等による水抜きの際、配管装置２が筐体外部に露出するように設けられているので、また、ドレン栓１１がストレーナキャップ８に着脱可能に取り付けられているので、エア抜きあるいは水抜き作業が容易であり、また、両配管接続部４、５の中心軸ｃ１、ｃ２をずらし、これに直交するように通水路６を設けたので、構造が簡単になって、鋳造、切削のほかに、鍛造による製造が可能なため内部の巣による水漏れがなく、部品の強度確保ができ、品質の向上を図ることができ、また、コスト低減ができ、コンパクト設計も可能である。   Further, when the strainer 7 is used for a long time and maintenance is performed, since the strainer 7 is accommodated in the water passage 6 so as to be orthogonal to the both water pipes 28, 29, the both water pipes 28, 29 become an obstacle. Without this, the strainer 7 can be taken out from the strainer outlet 10 for easy maintenance. Furthermore, when the hot water supply device 1 is installed, when the air is removed from the heat exchangers 33 and 34, or when the hot water is not used for a long period of time or when water is drained due to repair or the like, the piping device 2 is provided so as to be exposed to the outside of the casing. In addition, since the drain plug 11 is detachably attached to the strainer cap 8, the air venting or draining operation is easy, and the center axes c 1, c 2 of both the pipe connecting portions 4, 5 are shifted. Since the water passage 6 is provided so as to be orthogonal to this, the structure is simplified, and it is possible to manufacture by forging in addition to casting and cutting, so that there is no water leakage due to the internal nest, and the strength of the parts can be secured. The quality can be improved, the cost can be reduced, and a compact design is possible.

本実施形態に係る給湯装置によれば、流水抵抗が小さく、ス水熱交換器内のエア抜き、水抜きの際の作業等が容易でトレーナのメンテナンスが容易かつ、安価で小型な配管装置を備えた給湯装置が実現される。   According to the hot water supply apparatus according to the present embodiment, the resistance to flowing water is small, the air removal from the water heat exchanger, the work at the time of draining, etc. are easy, the maintenance of the trainer is easy, and the inexpensive and small piping apparatus. The provided hot water supply apparatus is realized.

なお、上記実施形態では熱源ユニットとしてヒートポンプを用いた例で説明したが、電気あるいは火力を用いたヒータ等を用いるものであってもよい。   In the above embodiment, the heat source is used as the heat source unit. However, a heater using electricity or thermal power may be used.

本発明に係る給湯装置を用いたヒートポンプ式冷凍サイクル系統図。The heat pump type refrigerating cycle system diagram using the hot-water supply apparatus which concerns on this invention. 本発明の一実施形態のヒートポンプ式給湯装置の本体カバーを除去して示す斜視図。The perspective view which removes and shows the main body cover of the heat pump type hot-water supply apparatus of one Embodiment of this invention. 本発明のヒートポンプ式給湯装置に用いられる配管装置の取り付け状態を示す斜視図。The perspective view which shows the attachment state of the piping apparatus used for the heat pump type hot-water supply apparatus of this invention. 本発明のヒートポンプ式給湯装置に用いられる配管装置の斜視図。The perspective view of the piping apparatus used for the heat pump type hot water supply apparatus of this invention. 本発明のヒートポンプ式給湯装置に用いられる配管装置の縦断面図。The longitudinal cross-sectional view of the piping apparatus used for the heat pump type hot-water supply apparatus of this invention. 本発明のヒートポンプ式給湯装置に用いられる配管装置の分解図。The exploded view of the piping apparatus used for the heat pump type hot water supply apparatus of this invention. 従来の配管装置の縦断面図。The longitudinal cross-sectional view of the conventional piping apparatus. 従来の配管装置の縦断面図。The longitudinal cross-sectional view of the conventional piping apparatus.

符号の説明Explanation of symbols

１…給湯装置、１Ａ…給湯装置筐体、１ａ…取付板、２…配管装置、３…配管装置本体、４…入口側配管接続部、５…出口側配管接続部、６…通水路、７…ストレーナ、８…ストレーナキャップ、９…ストレーナ取出口、１０…Ｏリング、１１…ドレン栓、１２…栓用Ｏリング、２１…熱源ユニット、２１Ａ…熱源ユニット筐体、２２…圧縮機、２３…給湯用熱交換器、２４…暖房用熱交換器、２６…熱源側熱交換器、２８…給湯用水配管、２８ａ…給湯用入口側水配管、２８ｂ…給湯用出口側水配管、２９…暖房用水配管、２９ａ…暖房用入口側水配管、２９ｂ…暖房用出口側水配管、３０…給湯用ポンプ、３１…暖房用ポンプ。   DESCRIPTION OF SYMBOLS 1 ... Hot water supply apparatus, 1A ... Hot water supply apparatus housing | casing, 1a ... Mounting plate, 2 ... Piping apparatus, 3 ... Piping apparatus main body, 4 ... Inlet side piping connection part, 5 ... Outlet side piping connection part, 6 ... Water flow path, 7 Strainer, 8 ... Strainer cap, 9 ... Strainer outlet, 10 ... O-ring, 11 ... Drain plug, 12 ... O-ring for plug, 21 ... Heat source unit, 21A ... Heat source unit housing, 22 ... Compressor, 23 ... Heat exchanger for hot water supply, 24 ... Heat exchanger for heating, 26 ... Heat source side heat exchanger, 28 ... Hot water supply water pipe, 28a ... Hot water supply inlet side water pipe, 28b ... Hot water supply outlet side water pipe, 29 ... Heating water Piping, 29a ... Heating inlet side water piping, 29b ... Heating outlet side water piping, 30 ... Hot water supply pump, 31 ... Heating pump.

Claims (1)

給湯装置筐体と、この給湯装置筐体に設けられた水熱交換器と、外部からこの水熱交換器に給水する水配管に設けられた配管装置等を備えた給湯装置において、
前記配管装置の入口側配管接続部と出口側配管接続部は、この両配管接続部を連通する通水路を設けることにより、前記両配管接続部の中心軸をずらして設けられ、前記通水路にはストレーナが設けられ、
前記入口側配管接続部と前記出口側配管接続部は各々の中心軸が平行になるようにずらされ、前記通水路は前記両中心軸に直交するように設けられ、前記ストレーナは前記通水路に着脱可能に設けられ、
前記ストレーナを前記通水路内に固定するストレーナキャップに、前記通水路からドレンを抜くためのドレン栓が着脱可能に設けられたことを特徴とする給湯装置。 In a hot water supply apparatus provided with a hot water supply device case, a water heat exchanger provided in the hot water supply device case, a pipe device provided in a water pipe for supplying water to the water heat exchanger from the outside, etc.
The inlet side pipe connection part and the outlet side pipe connection part of the piping device are provided by shifting the central axis of the both pipe connection parts by providing a water passage that communicates both the pipe connection parts. Has a strainer,
The inlet side pipe connection part and the outlet side pipe connection part are shifted so that the respective central axes are parallel to each other, the water passage is provided so as to be orthogonal to both the central axes, and the strainer is provided in the water passage. It is provided so as to be detachable,
A hot water supply apparatus , wherein a drain plug for removing a drain from the water passage is detachably provided on a strainer cap for fixing the strainer in the water passage .
JP2005192396A 2005-06-30 2005-06-30 Water heater Expired - Fee Related JP4421525B2 (en)

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JP5368175B2 (en) * 2009-06-08 2013-12-18 株式会社前川製作所 Water heater
JP5052571B2 (en) * 2009-07-07 2012-10-17 リンナイ株式会社 Hot water storage heating unit
JP2014055704A (en) * 2012-09-12 2014-03-27 Daikin Ind Ltd Pump fixing structure and hot water storage type water heater
JP6128331B2 (en) * 2014-02-26 2017-05-17 株式会社富士通ゼネラル Hot water heater
JP7344130B2 (en) * 2020-01-09 2023-09-13 株式会社コロナ Heat pump hot water heating system

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