JP7117765B2 - Water heater with instant hot water function - Google Patents

Water heater with instant hot water function Download PDF

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JP7117765B2
JP7117765B2 JP2018129368A JP2018129368A JP7117765B2 JP 7117765 B2 JP7117765 B2 JP 7117765B2 JP 2018129368 A JP2018129368 A JP 2018129368A JP 2018129368 A JP2018129368 A JP 2018129368A JP 7117765 B2 JP7117765 B2 JP 7117765B2
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友助 柿崎
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株式会社パロマ
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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
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Description

本発明は、外部配管と器具内の配管との間で湯水を循環させて熱交換器で加熱することで保温し、外部配管の給湯栓から即時給湯可能とした即湯機能付給湯器に関する。 The present invention relates to a water heater with an instant hot water function, in which hot water is circulated between an external pipe and a pipe inside the appliance and heated by a heat exchanger to keep the temperature warm, and hot water can be immediately supplied from the hot water tap of the external pipe.

給湯器には、熱交換器に接続される給水管に、循環ポンプを備えた戻り管を接続して即湯機能を備えたものが知られている（例えば特許文献１参照）。この即湯機能付給湯器では、出湯管と戻り管との間を外部配管で接続することで、出湯管と外部配管と戻り管と給水管とで循環経路を形成し、この循環経路に循環ポンプで湯水を循環させながら熱交換器で加熱することで保温運転が可能となる。よって、外部配管に設けた給湯栓を開栓すると、即時給湯が可能となる。 2. Description of the Related Art A known water heater has an instant hot water function by connecting a return pipe with a circulation pump to a water supply pipe connected to a heat exchanger (see, for example, Patent Document 1). In this water heater with instant hot water function, by connecting the hot water supply pipe and the return pipe with an external pipe, the hot water supply pipe, the external pipe, the return pipe, and the water supply pipe form a circulation path, and the water circulates through this circulation path. Warm water operation is possible by heating with a heat exchanger while circulating hot water with a pump. Therefore, when the hot water supply valve provided in the external pipe is opened, hot water can be supplied immediately.

特開２００４－２８６３９７号公報JP 2004-286397 A

この即湯機能付給湯器では、熱交換器の伝熱管での圧力損失が大きいため、給水管内の水が戻り管内を逆流して外部配管へ流れるおそれがあり、この場合、給湯栓から設定温度よりも低い温度で出湯されてしまう。
一方、ポンプは、自吸能力の有無によって自吸タイプと非自吸タイプとに分けられるが、非自吸タイプのポンプの方が自吸タイプよりも耐圧性及び最高使用流体温度が高いため、即湯機能付給湯器の循環ポンプとしては非自吸タイプが適している。
しかし、非自吸タイプのポンプは、吸い込み側を含むポンプ全体を呼び水で満たす必要がある上、空気分離室がないため、施工時にはエア抜きを行う必要がある。また、冬季に長期使用しない場合は、水抜きを行わないと凍結するおそれが生じる。 In this water heater with instant hot water function, the pressure loss in the heat transfer pipe of the heat exchanger is large, so there is a risk that the water in the water supply pipe will flow back through the return pipe and flow to the external pipe. Hot water is discharged at a lower temperature than
On the other hand, pumps are classified into self-priming type and non-self-priming type depending on whether or not they have self-priming capability. A non-self-priming type is suitable as a circulation pump for a water heater with a hot water function.
However, non-self-priming pumps must be filled with priming water, including the suction side, and there is no air separation chamber, so air must be removed during construction. In addition, when not used for a long period of time in winter, there is a risk of freezing unless the water is drained.

そこで、本発明は、外部配管への水の逆流による出湯温度の低下を防止すると共に、循環ポンプとして非自吸タイプを使用してもエア抜きや水抜きを容易に実施でき、施工や凍結予防が簡単に行える即湯機能付給湯器を提供すること目的としたものである。 Therefore, the present invention prevents the temperature of discharged hot water from dropping due to the backflow of water to the external pipe, and even if a non-self-priming type circulating pump is used, it is possible to easily perform air bleeding and water drainage, thereby preventing construction and freezing. To provide a water heater with an instant hot water function that can easily perform

上記目的を達成するために、請求項１に記載の発明は、バーナ及び熱交換器と、熱交換器に接続される給水管と、熱交換器に接続される出湯管と、給水管に接続され、循環ポンプを備えた戻り管と、を備え、出湯管と戻り管とを外部配管で接続することで、出湯管から出湯される湯水が外部配管を介して戻り管に戻り、給水管から熱交換器に至る循環経路が形成される即湯機能付給湯器であって、
戻り管における循環ポンプの下流側に逆止弁が設けられると共に、戻り管における循環ポンプと逆止弁との間に、器具外へ開放可能な分岐管が接続されていることを特徴とする。
請求項２に記載の発明は、請求項１の構成において、分岐管は、戻り管を形成する一部の配管と一体に形成されていることを特徴とする。
請求項３に記載の発明は、請求項２の構成において、逆止弁は、当該一部の配管内に設けられていることを特徴とする。 In order to achieve the above object, the invention according to claim 1 provides a burner and a heat exchanger, a water supply pipe connected to the heat exchanger, a hot water discharge pipe connected to the heat exchanger, and a water supply pipe connected to the water supply pipe. and a return pipe with a circulation pump, and the hot water discharge pipe and the return pipe are connected by an external pipe so that the hot water discharged from the hot water discharge pipe returns to the return pipe through the external pipe and is discharged from the water supply pipe. A water heater with a hot water function in which a circulation path leading to a heat exchanger is formed,
A check valve is provided downstream of the circulation pump in the return pipe, and a branch pipe that can be opened to the outside of the instrument is connected between the circulation pump and the check valve in the return pipe.
The invention according to claim 2 is characterized in that, in the structure according to claim 1, the branch pipe is integrally formed with a part of the pipe forming the return pipe.
The invention according to claim 3 is characterized in that, in the construction of claim 2, the check valve is provided in the part of the pipe.

請求項１に記載の発明によれば、戻り管における循環ポンプの下流側に逆止弁が設けられると共に、戻り管における循環ポンプと逆止弁との間に、器具外へ開放可能な分岐管が接続されているので、逆止弁によって外部配管への水の逆流による出湯温度の低下を防止できると共に、循環ポンプとして非自吸タイプを使用しても分岐管によってエア抜きや水抜きを容易に実施でき、施工や凍結予防が簡単に行える。
請求項２に記載の発明によれば、請求項１の効果に加えて、分岐管は、戻り管を形成する一部の配管と一体に形成されているので、戻り管へ分岐管を簡単に設けることができる。
請求項３に記載の発明によれば、請求項２の効果に加えて、逆止弁も横管内に設けられているので、分岐管と逆止弁とを含めたユニットとして簡単に設置できる。 According to the first aspect of the invention, a check valve is provided downstream of the circulation pump in the return pipe, and a branch pipe that can be opened to the outside of the instrument is provided between the circulation pump and the check valve in the return pipe. is connected, the check valve prevents the water from flowing back into the external pipe, which can cause the temperature of the hot water to drop. Even if a non-self-priming type circulating pump is used, the branch pipe makes it easy to remove air and water. It can be carried out at any time, and construction and freeze prevention can be easily performed.
According to the invention of claim 2, in addition to the effect of claim 1, the branch pipe is formed integrally with a part of the pipe forming the return pipe, so the branch pipe can be easily connected to the return pipe. can be provided.
According to the third aspect of the invention, in addition to the effect of the second aspect, since the check valve is also provided in the horizontal pipe, it can be easily installed as a unit including the branch pipe and the check valve.

給湯器の正面図である。It is a front view of a water heater. 給湯器の底面図である。It is a bottom view of a water heater. フロントカバーを外した状態の正面図である。It is a front view of the state which removed the front cover. 戻り管を正面から見た筐体下部の拡大図である。It is an enlarged view of the housing lower part which looked at the return pipe from the front. 戻り管における逆止弁部分の断面図である。FIG. 4 is a cross-sectional view of a check valve portion in a return pipe; 即湯システムの概略図である。1 is a schematic diagram of a hot water system; FIG.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は、即湯機能付給湯器（以下単に「給湯器」という。）の一例を示す正面図、図２は底面図である。この給湯器１は、前面を除く５面を閉塞した箱本体３と、箱本体３の前面を閉塞するフロントカバー４とからなる筐体２を有する。筐体２内には、フロントカバー４を外した状態の図３に示すように、下方からバーナユニット６、熱交換器７、排気フード８を備えた燃焼装置５が設置されて、排気フード８の上端に設けた排気筒９が、箱本体３の上板を貫通して上方へ突出している。箱本体３の背面上下には、屋内の壁等に設置するための取付金具１０，１０が設けられ、箱本体３の背板には、複数の給気口１１，１１・・が形成されている。
箱本体３の底面には、外部のガス配管が接続される管状のガス接続口１２と、外部の給水配管が接続される管状の給水接続口１３と、外部の給湯配管が接続される管状の給湯接続口１４及び管状の戻り接続口１５とが設けられている。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an example of a water heater with instant hot water function (hereinafter simply referred to as "water heater"), and FIG. 2 is a bottom view. This water heater 1 has a housing 2 composed of a box body 3 closing five surfaces except the front surface and a front cover 4 closing the front surface of the box body 3 . Inside the housing 2, as shown in FIG. An exhaust pipe 9 provided at the upper end of the box body 3 penetrates the upper plate of the box body 3 and protrudes upward. Mounting brackets 10, 10 for installation on an indoor wall or the like are provided on the upper and lower sides of the back surface of the box body 3, and a plurality of air supply ports 11, 11, . . . there is
On the bottom of the box body 3, there are a tubular gas connection port 12 to which an external gas pipe is connected, a tubular water supply connection port 13 to which an external water supply pipe is connected, and a tubular water supply connection port 13 to which an external hot water supply pipe is connected. A hot water connection 14 and a tubular return connection 15 are provided.

バーナユニット６は、内部に図示しない複数のバーナを備え、ここにはガス接続口１２と接続されてバーナへ燃料ガスを供給し、図示しない元弁や比例制御弁等を備えたガス管１６が接続されると共に、バーナへ燃焼用空気を供給するためのファン１７が設けられている。
熱交換器７は、図示しない複数のフィンを蛇行状に貫通する伝熱管１８を有し、伝熱管１８の入側端部には、給水接続口１３と接続される給水管１９が接続され、伝熱管１８の出側端部には、給湯接続口１４と接続される出湯管２０が接続されている。 The burner unit 6 has a plurality of burners (not shown) inside, and is connected to a gas connection port 12 to supply fuel gas to the burners. A fan 17 is provided for connection and for supplying combustion air to the burners.
The heat exchanger 7 has a heat transfer tube 18 passing through a plurality of fins (not shown) in a meandering manner, and a water supply pipe 19 connected to the water supply connection port 13 is connected to the inlet end of the heat transfer tube 18, A hot water outlet pipe 20 connected to the hot water supply connection port 14 is connected to the outlet end of the heat transfer pipe 18 .

そして、戻り接続口１５と給水管１９との間には、戻り管２１が接続されている。この戻り管２１は、図４にも示すように、管状の戻り接続口１５と、戻り接続口１５に下向きの吸込管２２ａが接続される非自吸タイプの循環ポンプ２２と、循環ポンプ２２の横向きの吐出管２２ｂに上流端が接続される横管２３と、横管２３の下流端に接続され、給水管１９の一部を形成する中継管２４から横向きに分岐形成された分岐管部２５とからなる。各管の端部同士をクリップ２６，２６・・で接続することで、戻り接続口１５から中継管２４に繋がる戻り管２１が形成される。中継管２４の上下端もクリップ２６でそれぞれ接続される。 A return pipe 21 is connected between the return connection port 15 and the water supply pipe 19 . As shown in FIG. 4, the return pipe 21 includes a tubular return connection port 15, a non-self-priming type circulation pump 22 having a downward suction pipe 22a connected to the return connection port 15, and a A horizontal pipe 23 whose upstream end is connected to a horizontal discharge pipe 22b, and a branch pipe portion 25 which is connected to the downstream end of the horizontal pipe 23 and branched laterally from a relay pipe 24 forming a part of the water supply pipe 19. Consists of By connecting the ends of each pipe with clips 26, 26 . The upper and lower ends of the relay pipe 24 are also connected by clips 26, respectively.

また、横管２３には、下向きの分岐管２７が設けられている。この分岐管２７は、箱本体３の底板に下端が接続されて下端を外部に開口させており、当該下端には、下方からプラグ２８がねじ込み固定されて、任意に下端を開放可能となっている。
さらに、横管２３の下流端には、図５に示すように、逆止弁２９が設けられて、給水管１９から循環ポンプ２２側への水の逆流を防止している。
ここでの横管２３と分岐管２７とは一体形成されて、横管２３に逆止弁２９を組み込んだＴ字状のユニットとなっているため、器具内への取り付け及び取り外しが容易に行える。特に、中継管２４も給水管１９の一部として別体で取り付けられるので、循環ポンプ２２とＴ字状の管体（逆止弁２９付の横管２３及び分岐管２７）と中継管２４とを循環路形成ユニットＵとして既存の給湯器に組み込むことで即湯機能を簡単に付与できる。 Further, the horizontal pipe 23 is provided with a downward branch pipe 27 . The lower end of the branch pipe 27 is connected to the bottom plate of the box body 3 and is open to the outside. A plug 28 is screwed from below and fixed to the lower end so that the lower end can be opened at will. there is
Furthermore, as shown in FIG. 5, a check valve 29 is provided at the downstream end of the horizontal pipe 23 to prevent backflow of water from the water supply pipe 19 to the circulation pump 22 side.
The horizontal pipe 23 and the branch pipe 27 here are integrally formed to form a T-shaped unit in which the check valve 29 is incorporated in the horizontal pipe 23, so that it can be easily attached to and removed from the instrument. . In particular, since the relay pipe 24 is also attached separately as part of the water supply pipe 19, the circulation pump 22, the T-shaped pipe body (the horizontal pipe 23 with the check valve 29 and the branch pipe 27) and the relay pipe 24 is incorporated into an existing hot water heater as a circulation path forming unit U, a quick hot water function can be easily imparted.

図６は、給湯器１を用いた即湯システム４０の概略を示すもので、循環経路に係る構成以外は省略している。３０は、給水管１９と出湯管２０との間を接続して熱交換器７をバイパスするバイパス管である。
この即湯システム４０は、給湯接続口１４と戻り接続口１５との間に、複数の給湯栓４２，４２・・を備えた外部配管４１を接続することで構築される。これにより、出湯管２０から出湯される湯水が、外部配管４１を通って戻り管２１に戻り、給水管１９を介して熱交換器７に戻る循環経路が形成される。よって、循環ポンプ２２の運転により循環経路内で湯水を循環させながらバーナユニット６でバーナを燃焼させることで、器具内に設けた図示しないコントローラで設定された設定温度での保温運転が可能となる。すなわち、給湯栓４２の何れかを開栓することで即時給湯が可能となっている。 FIG. 6 shows an outline of an instant hot water system 40 using the water heater 1, omitting the configuration other than the configuration related to the circulation path. A bypass pipe 30 connects the water supply pipe 19 and the hot water discharge pipe 20 to bypass the heat exchanger 7 .
This instant hot water system 40 is constructed by connecting an external pipe 41 having a plurality of hot water taps 42, 42 . . . As a result, a circulation path is formed in which hot water discharged from the hot water supply pipe 20 returns to the return pipe 21 through the external pipe 41 and returns to the heat exchanger 7 via the water supply pipe 19 . Therefore, by burning the burner in the burner unit 6 while hot water is circulated in the circulation path by the operation of the circulation pump 22, it is possible to perform the heat retention operation at the set temperature set by the controller (not shown) provided in the appliance. . That is, hot water can be supplied immediately by opening any one of the hot water taps 42 .

以上の如く構成された給湯器１においては、施工時には、非自吸タイプである循環ポンプ２２に対してエア抜きを行う必要があるため、プラグ２８を緩めるか取り外すかした状態で循環ポンプ２２を駆動させて水を循環させる試運転を行う。すると、配管内の空気が循環経路を流れる水によって押し出されて外部配管４１から戻り管２１に至り、循環ポンプ２２を通って分岐管２７から排出される。よって、エア抜きを容易に行うことができる。このとき分岐管２７の下流側の逆止弁２９には給水管１９からの水圧が加わるので、配管内の空気の殆どは逆止弁２９を通過することなく分岐管２７から排出される。
また、冬季に長期使用しない場合も、プラグ２８を緩めるか取り外すかすれば、循環ポンプ２２及び戻り管２１からの水抜きを分岐管２７を介して容易に行うことできる。
一方、即湯システム４０に組み込んで保温運転を行う際、熱交換器７の伝熱管１８での圧力損失が大きくなっても、戻り管２１には逆止弁２９が設けられているため、給水管１９内の水が戻り管２１内を逆流して外部配管４１へ流れるおそれがない。 In the water heater 1 configured as described above, it is necessary to bleed air from the circulation pump 22, which is of the non-self-priming type, at the time of installation. A test run is performed to drive and circulate water. Then, the air in the pipe is pushed out by the water flowing through the circulation path, reaches the return pipe 21 from the external pipe 41 , passes through the circulation pump 22 , and is discharged from the branch pipe 27 . Therefore, it is possible to easily remove the air. At this time, since the water pressure from the water supply pipe 19 is applied to the check valve 29 on the downstream side of the branch pipe 27 , most of the air in the pipe is discharged from the branch pipe 27 without passing through the check valve 29 .
Also, even if the apparatus is not used for a long period of time in winter, water can be easily drained from the circulation pump 22 and the return pipe 21 through the branch pipe 27 by loosening or removing the plug 28 .
On the other hand, when the hot water system 40 is incorporated into the hot water system 40 to perform a heat retention operation, even if the pressure loss in the heat transfer pipe 18 of the heat exchanger 7 increases, the return pipe 21 is provided with the check valve 29, so the water supply is prevented. There is no risk that the water in the pipe 19 will flow back through the return pipe 21 to the external pipe 41 .

このように、上記形態の給湯器１によれば、戻り管２１における循環ポンプ２２の下流側に逆止弁２９が設けられると共に、戻り管２１における循環ポンプ２２と逆止弁２９との間に、器具外へ開放可能な分岐管２７が接続されているので、逆止弁２９によって外部配管４１への水の逆流による出湯温度の低下を防止できると共に、循環ポンプ２２として非自吸タイプを使用しても分岐管２７によってエア抜きや水抜きを容易に実施でき、施工や凍結予防が簡単に行える。
特にここでは、分岐管２７は、戻り管２１を形成する一部の配管（横管２３）と一体に形成されているので、戻り管２１へ分岐管２７を簡単に設けることができる。
また、逆止弁２９も横管２３内に設けられているので、分岐管２７と逆止弁２９とを含めたユニットとして簡単に設置できる。 Thus, according to the water heater 1 of the above-described configuration, the check valve 29 is provided downstream of the circulation pump 22 in the return pipe 21 and between the circulation pump 22 and the check valve 29 in the return pipe 21. Since a branch pipe 27 that can be opened to the outside of the appliance is connected, the check valve 29 can prevent the temperature of the discharged hot water from flowing back to the external pipe 41, and a non-self-priming type circulation pump 22 can be used. Even if the branch pipe 27 is used, air and water can be removed easily, and construction work and prevention of freezing can be easily performed.
Particularly, here, the branch pipe 27 is formed integrally with a portion of the pipe (horizontal pipe 23 ) that forms the return pipe 21 , so the branch pipe 27 can be easily provided to the return pipe 21 .
Further, since the check valve 29 is also provided in the horizontal pipe 23, it can be easily installed as a unit including the branch pipe 27 and the check valve 29.

なお、上記形態では、逆止弁を横管に設けているが、中継管の分岐管部に設けてもよい。
また、戻り管を、戻り接続口と循環ポンプと横管と中継管の分岐管部とに分割して、分岐管を横管へ一体に設けているが、これに限らず、例えば横管と分岐管部とを一体に設けたり、横管と分岐管とを別体として接続したり等、分割形態は適宜変更可能である。
さらに、戻り管以外の給湯器の構成も上記形態に限らず、副熱交換器を備えた潜熱回収型や、給湯側と風呂側或いは暖房側との加熱回路を有する複合型等であっても、本発明は適用可能である。 In addition, although the check valve is provided in the horizontal pipe in the above embodiment, it may be provided in the branch pipe portion of the relay pipe.
In addition, the return pipe is divided into the return connection port, the circulation pump, the horizontal pipe, and the branch pipe portion of the relay pipe, and the branch pipe is provided integrally with the horizontal pipe. The form of division can be appropriately changed, such as providing the branch pipe portion integrally or connecting the horizontal pipe and the branch pipe as separate bodies.
Furthermore, the structure of the water heater other than the return pipe is not limited to the above form, and it may be a latent heat recovery type equipped with a sub heat exchanger, a composite type having a heating circuit between the hot water supply side and the bath side or heating side. , the present invention is applicable.

１・・即湯機能付給湯器、２・・筐体、３・・箱本体、４・・フロントカバー、５・・燃焼装置、６・・バーナユニット、７・・熱交換器、８・・排気フード、９・・排気筒、１２・・ガス接続口、１３・・給水接続口、１４・・給湯接続口、１５・・戻り接続口、１６・・ガス管、１９・・給水管、２０・・出湯管、２１・・戻り管、２２・・循環ポンプ、２３・・横管、２４・・中継管、２７・・分岐管、２８・・プラグ、２９・・逆止弁、４０・・即湯システム、４１・・外部配管、４２・・給湯栓。 DESCRIPTION OF SYMBOLS 1... Water heater with a hot water function, 2... Housing, 3... Box main body, 4... Front cover, 5... Combustion device, 6... Burner unit, 7... Heat exchanger, 8... Exhaust hood 9 Exhaust pipe 12 Gas connection port 13 Water supply connection port 14 Hot water supply connection port 15 Return connection port 16 Gas pipe 19 Water supply pipe 20 Hot water outlet pipe 21 Return pipe 22 Circulation pump 23 Horizontal pipe 24 Relay pipe 27 Branch pipe 28 Plug 29 Check valve 40 Instant hot water system, 41: external piping, 42: hot water tap.

Claims (3)

バーナ及び熱交換器と、
前記熱交換器に接続される給水管と、
前記熱交換器に接続される出湯管と、
前記給水管に接続され、循環ポンプを備えた戻り管と、を備え、
前記出湯管と前記戻り管とを外部配管で接続することで、前記出湯管から出湯される湯水が前記外部配管を介して前記戻り管に戻り、前記給水管から前記熱交換器に至る循環経路が形成される即湯機能付給湯器であって、
前記戻り管における前記循環ポンプの下流側に逆止弁が設けられると共に、
前記戻り管における前記循環ポンプと前記逆止弁との間に、器具外へ開放可能な分岐管が接続されていることを特徴とする即湯機能付給湯器。 a burner and a heat exchanger;
a water supply pipe connected to the heat exchanger;
a hot water outlet pipe connected to the heat exchanger;
a return pipe connected to the water supply pipe and equipped with a circulation pump;
By connecting the hot water supply pipe and the return pipe with an external pipe, the hot water discharged from the hot water supply pipe returns to the return pipe through the external pipe, and a circulation path from the water supply pipe to the heat exchanger. A water heater with an instant hot water function in which
A check valve is provided downstream of the circulation pump in the return pipe,
A water heater with a hot water function, characterized in that a branch pipe that can be opened to the outside of the appliance is connected between the circulation pump and the check valve in the return pipe. 前記分岐管は、前記戻り管を形成する一部の配管と一体に形成されていることを特徴とする請求項１に記載の即湯機能付給湯器。 2. The water heater with instant hot water function according to claim 1, wherein said branch pipe is formed integrally with a part of pipe forming said return pipe. 前記逆止弁は、前記一部の配管内に設けられていることを特徴とする請求項２に記載の即湯機能付給湯器。 3. The water heater with instant hot water function according to claim 2, wherein the check valve is provided in the part of the pipe.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004125228A (en) 2002-09-30 2004-04-22 Sekisui Chem Co Ltd Water heater
JP2004286397A (en) 2003-03-25 2004-10-14 Rinnai Corp Hot-water supply device with instantaneous hot-water supply function
JP2013152039A (en) 2012-01-25 2013-08-08 Noritz Corp Connection type water heater system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5518006B2 (en) * 2011-07-04 2014-06-11 東京瓦斯株式会社 Hot water system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004125228A (en) 2002-09-30 2004-04-22 Sekisui Chem Co Ltd Water heater
JP2004286397A (en) 2003-03-25 2004-10-14 Rinnai Corp Hot-water supply device with instantaneous hot-water supply function
JP2013152039A (en) 2012-01-25 2013-08-08 Noritz Corp Connection type water heater system

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