JP2020112276A - Water heater - Google Patents

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JP2020112276A
JP2020112276A JP2019001072A JP2019001072A JP2020112276A JP 2020112276 A JP2020112276 A JP 2020112276A JP 2019001072 A JP2019001072 A JP 2019001072A JP 2019001072 A JP2019001072 A JP 2019001072A JP 2020112276 A JP2020112276 A JP 2020112276A
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heat exchanger
water
neutralizer
heat
drain pipe
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JP7181095B2 (en
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竹年 田村
Taketoshi Tamura
竹年 田村
聡 古舘
Satoshi Koyakata
聡 古舘
順也 綿貫
Junya Watanuki
順也 綿貫
寿英 鈴木
Toshihide Suzuki
寿英 鈴木
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Corona Corp
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Corona 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]

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Abstract

To compactify a water heater.SOLUTION: A water heater includes: a first heat exchanger 5 exchanging heat by using heat of combustion exhaust gas generated through combustion of a burner 2; a second heat exchanger 7 recovering latent heat from the combustion exhaust gas that has passed through the first heat exchanger and heating flowing water; a water collection port 10 collecting and discharging condensation water generated in the second heat exchanger; a neutralizer 11 neutralizing the condensation water; and drain piping 15 connecting the water collection port and the neutralizer and guiding the condensation water to the neutralizer. The first heat exchanger is disposed between the water collection port and the neutralizer, and the drain piping is provided adjacent to the first heat exchanger, so as to reduce the size of the neutralizer and thus compactify the water heater.SELECTED DRAWING: Figure 1

Description

本発明は、潜熱回収用のドレン中和器を小さくすることで小型化を行う給湯機に関するものである。 TECHNICAL FIELD The present invention relates to a water heater that reduces the size of a drain neutralizer for latent heat recovery.

従来よりこの種の潜熱回収型の給湯機では、筐体内にバーナと、このバーナの熱で熱交換する第１熱交換器と、この第１熱交換器を通過した燃焼排気ガスから潜熱回収して流水を加熱する第２熱交換器と、この第２熱交換器で発生した結露水を中和する中和器と、を備えることで熱交換効率の良い給湯を行うことができるものであった。（例えば、特許文献１参照。） Conventionally, in this type of latent heat recovery type water heater, a latent heat is recovered from the burner in the housing, the first heat exchanger that exchanges heat with the heat of the burner, and the combustion exhaust gas that has passed through the first heat exchanger. By providing a second heat exchanger that heats the flowing water by means of heat, and a neutralizer that neutralizes the dew condensation water generated in this second heat exchanger, hot water can be supplied with good heat exchange efficiency. It was (For example, refer to Patent Document 1.)

特許５３０６９０９号公報Japanese Patent No. 5306909

このような給湯機は、潜熱回収して熱交換効率を向上するために、第２熱交換器と中和器を筐体内に備えることで、給湯機全体が大きくなる傾向に有り、給湯機の設置スペースを小さくしたり、輸送コストを下げるためにコンパクト化を必要としていた。 Such a water heater has a second heat exchanger and a neutralizer in the housing in order to recover latent heat and improve heat exchange efficiency, so that the entire water heater tends to be large. They needed to be compact in order to reduce the installation space and transportation costs.

上記課題を解決するために、本発明では、バーナの燃焼で発生する燃焼排気ガスの熱で熱交換する第１熱交換器と、
前記第１熱交換器を通過した燃焼排気ガスから潜熱回収して流水を加熱する第２熱交換器と、
前記第２熱交換器で発生した結露水を集めて排水する集水口と、
前記結露水を中和する中和器と、
前記集水口と前記中和器を接続し、前記結露水を中和器へ導くドレン配管と、を備え、
前記集水口と前記中和器の間に前記第１熱交換器を配置し、
前記ドレン配管を前記第１熱交換器に近接して備えるものである。 In order to solve the above problems, in the present invention, a first heat exchanger for exchanging heat with the heat of combustion exhaust gas generated by combustion of a burner,
A second heat exchanger that heats running water by recovering latent heat from the combustion exhaust gas that has passed through the first heat exchanger;
A water collecting port for collecting and discharging the condensed water generated in the second heat exchanger,
A neutralizer for neutralizing the condensed water,
A drain pipe that connects the water collection port and the neutralizer and guides the condensed water to the neutralizer;
Arranging the first heat exchanger between the water collecting port and the neutralizer,
The drain pipe is provided near the first heat exchanger.

本発明では、第２熱交換器で発生した結露水を中和器へ導くドレン配管を、第１熱交換器に近接して備えることで、中和器に排水された結露水の温度を上昇する。それによって、結露水の中和反応を促進することで、中和器内に蓄える中和剤の量を少なくすることができ、中和器を小型化することができる。
また、中和器を小型化することで給湯機を小さくでき、設置スペースを小さくし、輸送コストを下げることができる。 In the present invention, the drain pipe for guiding the condensed water generated in the second heat exchanger to the neutralizer is provided close to the first heat exchanger to increase the temperature of the condensed water discharged to the neutralizer. To do. Thereby, by promoting the neutralization reaction of the condensed water, the amount of the neutralizing agent stored in the neutralizer can be reduced, and the neutralizer can be downsized.
Further, by downsizing the neutralizer, the water heater can be downsized, the installation space can be reduced, and the transportation cost can be reduced.

本実施形態における給湯機の概略構成図。The schematic block diagram of the water heater in this embodiment. 同正面図。。The front view. .. 同第１熱交換器の左側面方向の断面図。Sectional drawing of the left side direction of the same 1st heat exchanger.

本発明の一実施形態の給湯機を添付図面に基づいて説明する。 A water heater according to an embodiment of the present invention will be described with reference to the accompanying drawings.

１はこの実施形態の給湯機の筐体、２は石油等を燃料とし下向きに火炎を発生する燃焼部であるバーナ、３はバーナ２に燃焼用の空気を供給すると共に、燃焼後の排気ガスを屋外に排気する排気ファン、４はバーナ２の下方に備えられた燃焼室、５は燃焼室４内に設けられバーナ２の燃焼に伴い発生する燃焼排気ガスの顕熱を回収するフィンチューブ式の熱交換器で構成された熱交換部としての第１熱交換器である。 Reference numeral 1 is a casing of the water heater of this embodiment, 2 is a burner which is a combustion section for generating downward flames using petroleum as a fuel, and 3 is air for combustion to the burner 2 and exhaust gas after combustion. An exhaust fan for exhausting air to the outside, 4 is a combustion chamber provided below the burner 2, and 5 is a fin-tube type that is provided inside the combustion chamber 4 and recovers the sensible heat of the combustion exhaust gas generated by the combustion of the burner 2. It is a 1st heat exchanger as a heat exchange part comprised by the heat exchanger of.

６は燃焼室４の下流側に配置され、燃焼室４の底部に一端を連通し、バーナ２で発生する排気ガスの排出に伴う騒音を低減させる消音装置で、消音装置６の他端は、ステンレス製の箱体で形成された熱交換部としての第２熱交換器７と排気ダクト８を介して連通しており、第２熱交換器７は潜熱を回収する熱交換器で構成され、消音装置６を通過した燃焼排気ガスが露点以下になるまで熱交換させて結露水（ドレン）が生成される。また、９は第２熱交換器７を通過した排気ガスを筐体１の屋外へ排出させ消音装置６、排気ダクト８に連通した排気経路である。第２熱交換器７の下方には、第２熱交換器７で発生したドレンを集める集水口１０を有する。 Reference numeral 6 denotes a muffler that is arranged on the downstream side of the combustion chamber 4 and has one end communicating with the bottom of the combustion chamber 4 to reduce noise accompanying exhaust gas emission of the burner 2. The other end of the muffler 6 is It communicates with the second heat exchanger 7 as a heat exchange portion formed of a stainless steel box through an exhaust duct 8, and the second heat exchanger 7 is composed of a heat exchanger for recovering latent heat, The combustion exhaust gas that has passed through the silencer 6 is heat-exchanged until the temperature becomes equal to or lower than the dew point, and condensed water (drain) is generated. Reference numeral 9 denotes an exhaust path that discharges the exhaust gas that has passed through the second heat exchanger 7 to the outside of the housing 1 and communicates with the silencer 6 and the exhaust duct 8. Below the second heat exchanger 7, there is a water collecting port 10 for collecting drainage generated in the second heat exchanger 7.

１１は第２熱交換器７と連通し第２熱交換器７で生成されたドレンを一旦貯留する中和器で、上面中央には第２熱交換器７と連通しドレンが流入する流入口１２と、内部に炭酸カルシウムからなる中和剤を充填し、流入口１２から流入される第２熱交換器７で発生した強酸性のドレンを貯留し中和して、一側壁の上部に形成された流出口１３から排水するものであり、底部には中のドレンを全て排出可能の水抜き栓１４が設けられている。 Reference numeral 11 is a neutralizer that communicates with the second heat exchanger 7 and temporarily stores the drain generated in the second heat exchanger 7. The neutralizer 11 communicates with the second heat exchanger 7 and the drain flows into the center of the upper surface. 12 and a neutralizing agent made of calcium carbonate are filled inside, and the strongly acidic drain generated in the second heat exchanger 7 flowing from the inflow port 12 is stored and neutralized, and is formed on the upper part of one side wall. The water is drained from the drained outlet 13, and a drain plug 14 that can drain all the drain inside is provided at the bottom.

１５は集水口１０と流入口１２を接続するドレン配管で、高温の第１熱交換器５の近傍に配置することによって、ドレン配管１５内を通過するドレンを加熱して中和器１１へ導くことができる。中和器１１に排水されたドレンの温度は上昇する。これによって、ドレンの中和反応を促進し、中和器１１内に蓄える中和剤の量を少なくすることができ、中和器１１を小型化することができる。また、ドレン配管１５はステンレス等の耐食性、耐熱性の高い金属配管よりなるものである。 Reference numeral 15 is a drain pipe that connects the water collecting port 10 and the inflow port 12, and is arranged near the high-temperature first heat exchanger 5 to heat the drain passing through the drain pipe 15 and guide it to the neutralizer 11. be able to. The temperature of the drain drained to the neutralizer 11 rises. As a result, the neutralization reaction of drain is promoted, the amount of the neutralizing agent stored in the neutralizer 11 can be reduced, and the neutralizer 11 can be downsized. The drain pipe 15 is made of metal pipe such as stainless steel having high corrosion resistance and heat resistance.

前記第１熱交換器５は平行に並べた多数の銅板５ａ（フィン）に多数のＵ字形の銅管５ｂ（パイプ）を貫通して形成し、銅管５ｂ内を流れる水道水を加熱する。５ｃは熱交枠で、銅板５ａの端部が接触している。第１熱交換器５はバーナ２によって上方向から加熱されることで、上部が下部よりも高温になり、銅板５ａと接触する熱交枠５ｃのバーナ２側も高温部となる。バーナ２と燃焼室４と第１熱交換器５は筐体１の左右方向の略中央に配置されている。第２熱交換器７は第１熱交換器５の右側に配置され、中和器１１は第１熱交換器５の左側下方に配置され、高温の第１熱交換器５上部の前側近傍を横切ってドレン配管１５が配置されることで、ドレン配管１５が加熱される。 The first heat exchanger 5 is formed by penetrating a large number of U-shaped copper pipes 5b (pipes) in a large number of parallel copper plates 5a (fins), and heats tap water flowing in the copper pipes 5b. A heat exchange frame 5c is in contact with the ends of the copper plate 5a. The first heat exchanger 5 is heated from above by the burner 2, so that the upper portion has a higher temperature than the lower portion, and the burner 2 side of the heat exchange frame 5c that comes into contact with the copper plate 5a also has a high temperature portion. The burner 2, the combustion chamber 4, and the first heat exchanger 5 are arranged substantially in the center of the housing 1 in the left-right direction. The second heat exchanger 7 is arranged on the right side of the first heat exchanger 5, the neutralizer 11 is arranged on the lower left side of the first heat exchanger 5, and the vicinity of the front side of the upper part of the high temperature first heat exchanger 5 is arranged. By disposing the drain pipe 15 across the drain pipe 15, the drain pipe 15 is heated.

前記流出口１３から筐体１の排水口１７までの間を、該排水口１７に向かって徐々に登り傾斜した連通管１６で連通し、この連通管１６途中に一対の水位検知電極１８を備え、中和器１１内のドレンの水位を検知する。 A communication pipe 16 that gradually rises and slopes toward the drainage port 17 communicates between the outlet 13 and the drainage port 17 of the housing 1, and a pair of water level detection electrodes 18 are provided in the middle of the communication pipe 16. The water level of the drain inside the neutralizer 11 is detected.

２０は給水管、２１は出湯管、２２は給水管２０から分岐した給水バイパス管、２３は出湯管２１からの湯と給水バイパス管２２からの水とを混合し、その混合比を可変できる混合弁、２４は混合弁２３で混合された湯を給湯栓（図示せず）に給湯するための給湯管、２５は給水管２０に設けられ給水温度を検出する給水温度センサ、２６は給水管２０に設けられ流量を検出する流量センサ、２７は給湯管２４に設けられ給湯温度を検出する給湯温度センサである。 20 is a water supply pipe, 21 is a hot water supply pipe, 22 is a water supply bypass pipe branched from the water supply pipe 20, 23 is hot water from the hot water supply pipe 21 and water from the water supply bypass pipe 22, and the mixing ratio can be varied. A valve, 24 is a hot water supply pipe for supplying hot water mixed by the mixing valve 23 to a hot water tap (not shown), 25 is a water supply temperature sensor provided in the water supply pipe 20 to detect the water supply temperature, and 26 is the water supply pipe 20. A hot water supply temperature sensor is provided in the hot water supply pipe 24 to detect the hot water flow, and a hot water supply temperature sensor 27 is provided in the hot water supply pipe 24 to detect the hot water supply temperature.

２８は給湯機に内蔵され、マイクロコンピュータを主体としてこの給湯機の各センサの信号を受け、各アクチュエータの駆動を制御する制御部であり、入力側には給水温度センサ２５や流量センサ２６や給湯温度センサ２７や水位検知電極１８が接続されており、出力側にはバーナ２や排気ファン３や混合弁２３がそれぞれ接続されている。 Reference numeral 28 denotes a control unit that is built in the water heater and mainly controls a microcomputer to receive signals from the sensors of the water heater and control the drive of each actuator. The input side has a water temperature sensor 25, a flow sensor 26, and a water heater. The temperature sensor 27 and the water level detection electrode 18 are connected, and the burner 2, the exhaust fan 3, and the mixing valve 23 are connected to the output side.

次にこの一実施形態の作動について説明する。
今適宜箇所の給湯栓が開栓されて給湯が開始されると、この水の流れを流量センサ２６が検知し、バーナ２の燃焼を開始させる最低作動流量以上の流量になると、制御部２８は熱要求ありと判断し、バーナ２の燃焼を電磁ポンプ（図示せず）や点火器（図示せず）を駆動して開始させる。この燃焼により発生した燃焼排気ガスは第１熱交換器５に流入し、第１熱交換器５で給水と熱交換し、第１熱交換器５を通過した燃焼排気ガスは、消音装置６にて下向きから上向きにＵターンされ、排気ダクト８を介して第２熱交換器７に上向きに流入し、第２熱交換器７内に流入してくる給水と熱交換し、第２熱交換器７を通過した後、排気経路９から外部へ排出されるものである。 Next, the operation of this embodiment will be described.
When the hot water supply taps at appropriate points are now opened and hot water supply is started, the flow rate sensor 26 detects the flow of this water, and when the flow rate exceeds the minimum operation flow rate at which the burner 2 starts combustion, the control unit 28 It is determined that there is a heat request, and combustion of the burner 2 is started by driving an electromagnetic pump (not shown) and an igniter (not shown). The combustion exhaust gas generated by this combustion flows into the first heat exchanger 5, exchanges heat with the feed water in the first heat exchanger 5, and the combustion exhaust gas that has passed through the first heat exchanger 5 enters the silencer 6. And makes a U-turn from downward to upward, flows upward through the exhaust duct 8 into the second heat exchanger 7, exchanges heat with the feed water flowing into the second heat exchanger 7, and the second heat exchanger After passing through 7, the gas is discharged from the exhaust path 9 to the outside.

この第２熱交換器７で温度上昇した温水は第１熱交換器５に流入し、ここでバーナ２の燃焼で発生した燃焼排気ガスとの熱交換で更に加熱されて、給湯として給湯栓から出湯されるものであり、この時、制御部２８は給湯温度センサ２７の検出する温度からユーザが設定した給湯設定温度になるようにバーナ２の燃焼量や混合弁２３の開度の調節するものである。 The warm water whose temperature has risen in the second heat exchanger 7 flows into the first heat exchanger 5, where it is further heated by heat exchange with the combustion exhaust gas generated by the combustion of the burner 2, and is heated from the hot water tap as hot water supply. Hot water is discharged, and at this time, the control unit 28 adjusts the combustion amount of the burner 2 and the opening degree of the mixing valve 23 so that the temperature detected by the hot water supply temperature sensor 27 reaches the hot water supply set temperature set by the user. Is.

また第１熱交換器５及び第２熱交換器７で給水と燃焼排気ガスが熱交換され、露点以下になることにより生成されたドレンは、第２熱交換器７の集水口１０からドレン配管１５を通過するときに加熱され、流入口１２を介して中和器１１に貯留され、中和器１１内に充填された中和剤により中和された後、流出口１３、連通管１６、排水口１７を介して筐体１外へ排出されるものである。 In addition, the drainage generated when the feed water and the combustion exhaust gas are heat-exchanged in the first heat exchanger 5 and the second heat exchanger 7 and becomes lower than the dew point is the drain pipe from the water collecting port 10 of the second heat exchanger 7. 15 is heated when passing through 15, is stored in the neutralizer 11 through the inflow port 12, and is neutralized by the neutralizing agent filled in the neutralizer 11, and then the outflow port 13 and the communication pipe 16, It is discharged to the outside of the housing 1 through the drainage port 17.

このように、ドレン配管１５を通過する際にドレンが加熱されることで、中和器１１に排水されたドレンの温度を上昇する。それによって、ドレンの中和反応を促進することで、中和器１１内に蓄える中和剤の量を少なくすることができ、中和器１１を小型化することができる。 As described above, the drain is heated when passing through the drain pipe 15, so that the temperature of the drain discharged to the neutralizer 11 is increased. Thereby, by promoting the neutralization reaction of drain, the amount of the neutralizing agent stored in the neutralizer 11 can be reduced, and the neutralizer 11 can be downsized.

以上のように本発明によれば、第２熱交換器７で発生したドレンを中和器１１へ導くドレン配管１５を、第１熱交換器５に近接して備えることで、中和器１１に排水されたドレンの温度を上昇する。それによって、ドレンの中和反応を促進することで、中和器１１内に蓄える中和剤の量を少なくすることができ、中和器１１を小型化することができる。
また、中和器１１を小型化することで給湯機を小さくでき、設置スペースを小さくし、輸送コストを下げることができる。 As described above, according to the present invention, the drain pipe 15 for guiding the drain generated in the second heat exchanger 7 to the neutralizer 11 is provided close to the first heat exchanger 5, so that the neutralizer 11 is provided. Raise the temperature of the drainage drained to. Thereby, by promoting the neutralization reaction of drain, the amount of the neutralizing agent stored in the neutralizer 11 can be reduced, and the neutralizer 11 can be downsized.
Further, by downsizing the neutralizer 11, the water heater can be downsized, the installation space can be reduced, and the transportation cost can be reduced.

また、本実施形態ではドレン配管１５を第１熱交換器５に接触して配置したが、第１熱交換器５からの輻射熱によってドレン配管１５を加熱しても良い。また、逆に第１熱交換器５とドレン配管１５を溶接等によって接続すればよりドレン配管１５内のドレンを加熱することができる。 Further, although the drain pipe 15 is arranged in contact with the first heat exchanger 5 in the present embodiment, the drain pipe 15 may be heated by the radiant heat from the first heat exchanger 5. On the contrary, if the first heat exchanger 5 and the drain pipe 15 are connected by welding or the like, the drain in the drain pipe 15 can be further heated.

また、本実施形態で用いたその他の構成は一例として提示したものであり、発明の範囲を限定することは意図しておらず、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲において、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれると共に、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 Further, the other configurations used in the present embodiment are presented as examples, and are not intended to limit the scope of the invention, and can be implemented in various other modes. Various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are also included in the invention described in the claims and an equivalent range thereof.

１ 筐体
２ バーナ
５ 第１熱交換器
７ 第２熱交換器
１０ 集水口
１１ 中和器
１５ ドレン配管 1 Case 2 Burner 5 First Heat Exchanger 7 Second Heat Exchanger 10 Water Collection Port 11 Neutralizer 15 Drain Pipe

Claims (3)

バーナの燃焼で発生する燃焼排気ガスの熱で流水を加熱する第１熱交換器と、
前記第１熱交換器を通過した燃焼排気ガスから潜熱回収して流水を加熱する第２熱交換器と、
前記第２熱交換器で発生した結露水を集めて排水する集水口と、
前記結露水を中和する中和器と、
前記集水口と前記中和器を接続し、前記結露水を中和器へ導くドレン配管と、を備え、
前記集水口と前記中和器の間に前記第１熱交換器を配置し、
前記ドレン配管を前記第１熱交換器に近接して備えることを特徴とする給湯機。 A first heat exchanger for heating running water with heat of combustion exhaust gas generated by combustion of a burner;
A second heat exchanger that heats running water by recovering latent heat from the combustion exhaust gas that has passed through the first heat exchanger;
A water collecting port for collecting and discharging the condensed water generated in the second heat exchanger,
A neutralizer for neutralizing the condensed water,
A drain pipe that connects the water collection port and the neutralizer and guides the condensed water to the neutralizer;
Arranging the first heat exchanger between the water collecting port and the neutralizer,
A water heater comprising the drain pipe in the vicinity of the first heat exchanger. 筐体内の略中央に前記第１熱交換器を有し、
前記第１熱交換器の側部に前記第２熱交換器を、
前記第１熱交換器の他方の側部に中和器を、配置し、
前記ドレン配管を前記第１熱交換器の側面に近接して備えることを特徴とする請求項１に記載の給湯機。 The first heat exchanger is provided substantially in the center of the housing,
The second heat exchanger on the side of the first heat exchanger,
A neutralizer on the other side of the first heat exchanger,
The water heater according to claim 1, wherein the drain pipe is provided adjacent to a side surface of the first heat exchanger. 前記第１熱交換器は側壁を形成する熱交枠内に、平行に並べた多数のフィンにパイプを貫通して形成し、前記フィンの端部は前記熱交枠と接触する構成とし、
前記第１熱交換器の前記バーナ側の前記熱交枠に前記フィンと接触する高温部を備え、
前記ドレン配管は前記高温部の側面に近接して備えることを特徴とする請求項１または２に記載の給湯機。 The first heat exchanger is formed by penetrating a pipe into a large number of fins arranged in parallel in a heat exchange frame forming a side wall, and an end portion of the fin is in contact with the heat exchange frame,
The burner side heat exchange frame of the first heat exchanger is provided with a high temperature portion that comes into contact with the fins;
The water heater according to claim 1 or 2, wherein the drain pipe is provided near a side surface of the high temperature portion.
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JP2006175301A (en) * 2004-12-20 2006-07-06 Noritz Corp Condensed water neutralization device and hot-water system provided with it
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000055466A (en) * 1998-07-31 2000-02-25 Gastar Corp Latent heat recovery type combustion apparatus
JP2006175301A (en) * 2004-12-20 2006-07-06 Noritz Corp Condensed water neutralization device and hot-water system provided with it
JP2006177623A (en) * 2004-12-22 2006-07-06 Noritz Corp Water heater
JP5306909B2 (en) * 2009-06-04 2013-10-02 株式会社コロナ Heat exchanger
JP2011206632A (en) * 2010-03-29 2011-10-20 Noritz Corp Neutralization apparatus and heat source machine
JP2012137249A (en) * 2010-12-27 2012-07-19 Rinnai Corp Drain neutralizer
JP2012163237A (en) * 2011-02-04 2012-08-30 Corona Corp Latent heat recovery type water heater
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