CN102444931B - Device and method for hot water circulation based on water tank type water heater - Google Patents

Device and method for hot water circulation based on water tank type water heater Download PDF

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Publication number
CN102444931B
CN102444931B CN201010500916.5A CN201010500916A CN102444931B CN 102444931 B CN102444931 B CN 102444931B CN 201010500916 A CN201010500916 A CN 201010500916A CN 102444931 B CN102444931 B CN 102444931B
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China
Prior art keywords
temperature
water
sensing probe
controller
booster pump
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Expired - Fee Related
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CN201010500916.5A
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CN102444931A (en
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凌海勇
程菲
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SHANGHAI LINGBEI HEATING AND COOLING EQUIPMENT ENGINEERING CO LTD
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SHANGHAI LINGBEI HEATING AND COOLING EQUIPMENT ENGINEERING CO LTD
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Publication of CN102444931A publication Critical patent/CN102444931A/en
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Publication of CN102444931B publication Critical patent/CN102444931B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a device and a method for hot water circulation based on a water tank type water heater. The method for hot water circulation comprises the steps of: triggering a boosting pump to generate a circulating water flow by opening a water faucet; judging whether a water temperature acquired by a first temperature sensing probe reaches a preset temperature by a controller, if so, judging a water temperature acquired by a second temperature sensing probe by the controller, if not, carrying out no operation; the controller judging whether the water temperature acquired by the second temperature sensing probe reaches a preset temperature, if so, the controller controlling the boosting pump to stop working, if not, the boosting pump continuing to work. According to the device and the method for hot water circulation based on the water tank type water heater disclosed by the invention, the water tank type water heater is added into the device for hot water circulation, so that both energy saving effect and water saving effect are realized at the same time.

Description

Hot water circulating device based on cistern type water heater and method
Technical field
The present invention relates to a kind of method and apparatus of hot water circuit, relate in particular to a kind of method and apparatus of the hot water circuit based on heater for cistern.
Background technology
The hot water cyclesystem adopting in house decoration at present is both at home and abroad divided into and does not circulate and circulate two kinds, endless form waste water resource greatly not, be not suitable for that present low-carbon (LC) requires and the comfort level of water is also very low, particularly large units, are only suitable for small units; So present most of large units family all adopts hot water cyclesystem that hot water is provided.
Hot water cyclesystem of the prior art adopts temp sensing type, timing temp sensing type, manual delayed type etc. more, and these above-mentioned hot water cyclesystems are all in hot water tube system, to add a return pipe, accelerate the water speed that of hot water by circulating pump.Temp sensing type hot water cyclesystem is by an attemperating unit controlled circulation pump, when attemperating unit monitors water temperature lower than setting value, attemperating unit is controlled water heater heating, guaranteed that like this water temperature in water heater all the time can be lower than setting value, but this mode makes the frequency of water heater working too frequent, whether power consumption values is very high, and have hot water all can circulate, and causes very large waste; Regularly temp sensing type circulation: increased timing function on the basis of tangible temp sensing type hot water circuit, to increase service efficiency, but also to use, brought significant limitation because hydronic efficiency is not high within the timing period, and outside the timing period without circulatory function.Hand delayed type circulation: both used the delay switch in region to start before use circulating pump by being arranged on, after two to three minutes, just there is hot water out, this mode has improved the service efficiency of system greatly, if but hot-water heating system pipeline is very long, once circulation just can not meet instructions for use, and there is no hot water function of increasing pressure.
Summary of the invention
The object of this invention is to provide a kind of hot water circuit method and apparatus based on heater for cistern, in order to solve the problem of the energy of hot water circulating device and the waste of water resource in prior art.
Above-mentioned purpose of the present invention is achieved through the following technical solutions:
A hot water circulating device based on cistern type water heater, comprises, cistern type water heater, wherein, and a hot water booster pump, it is installed on described cistern type water heater's outlet pipe, for the water extraction to hot water circulating device, supplies hydraulic pressure; One expansion tank, is arranged on described outlet pipe; One first temperature-sensing probe, is arranged on the delivery port of described heater for cistern, for obtaining the water temperature in cistern type water heater; One second temperature-sensing probe, is arranged on described oral siphon, for obtaining the water temperature in hot water circulating device; One controller, it is connected with described the first temperature-sensing probe, the second temperature-sensing probe and described booster pump respectively, after being triggered by hot water booster pump, judging whether water temperature that the first temperature-sensing probe and the second temperature-sensing probe obtain reaches minute is clipped to preset temperature separately, as the first temperature-sensing probe reach its preset temperature controller receive the water temperature data that the second temperature-sensing probe detects, as the second temperature-sensing probe reaches its preset temperature, described controller is controlled described booster pump and is quit work, otherwise, described booster pump continuous firing.
Above-mentioned hot water circulating device, wherein, described controller also has timing function, in timing, and the water temperature that the first temperature-sensing probe obtains reaches in the situation of design temperature, the water temperature of obtaining as the second temperature-sensing probe does not reach a preset temperature, and described controller is controlled described booster pump continuous firing, preset temperature as described in the water temperature of obtaining as the second temperature-sensing probe reaches, described controller is controlled described booster pump and is quit work.
Above-mentioned hot water circulating device, wherein, described outlet pipe is connected with a return pipe, and described oral siphon, described return pipe are connected by a threeway with a feed pipe.
Above-mentioned hot water circulating device, wherein, wherein, described feed pipe is provided with one first check-valves, and described return pipe is provided with one second check-valves.
Above-mentioned hot water circulating device, wherein, is respectively provided with an on-off valve on described oral siphon and described outlet pipe.
A method for hot water circuit based on cistern type water heater, wherein, comprising: by the tap of fetching boiling water, trigger a booster pump and produce circulating water flow; By a controller, judge whether the water temperature that the first temperature-sensing probe obtains reaches a preset temperature, as reach preset temperature, the water temperature that controller obtains the second temperature-sensing probe judges, otherwise, do not carry out any operation; Controller judges whether the water temperature that the second temperature-sensing probe obtains reaches a preset temperature, as reaches preset temperature, and controller is controlled described booster pump and quit work, otherwise, described booster pump continuous firing.
Above-mentioned hot water circuit method, wherein, also comprise: the continuous heating time is set in described controller, at this continuous heating in the time, and the water temperature that the first temperature-sensing probe detects reaches in the situation of preset temperature, by a controller, judges whether the water temperature that the second temperature-sensing probe obtains reaches its preset temperature, as reach preset temperature, controller is controlled described booster pump and is quit work, otherwise, described booster pump continuous firing.
Above-mentioned hot water circuit method, wherein, comprise: by the tap of fetching boiling water, continue to use hot water, by a controller, judge that whether water temperature that the first temperature-sensing probe obtains is higher than a preset temperature, as higher than preset temperature, the water temperature that controller obtains the second temperature-sensing probe judges, otherwise, do not carry out any operation; Controller starts to receive the data of the second temperature-sensing probe; The cold water of flowing through continues to enter heater for cistern; Described controller judges whether the water temperature that the second temperature-sensing probe obtains reaches a preset temperature, as does not reach preset temperature, and controller is controlled booster pump continuous firing described in described booster pump, as reaches, and controller is controlled booster pump and quit work.
Above-mentioned hot water circuit method, wherein, any time first desired temperature that detects of temperature-sensing probe lower than design temperature control panel control booster pump and quit work.
In sum, the hot water circulating device and the method that the present invention is based on cistern type water heater have solved the water resource waste causing without circulation in prior art and have gone out water speed slow, and the problem of the energy waste that causes of existing circulatory system continuous heating, add return pipe to make device there is circulatory function, without discharging cold water, can directly use hot water, and be provided with timing function and can in setting-up time, heat, all the other time period internal triggers heating, realize energy-conservation, the double effects of water saving.The present invention can also realize Automatic-boosting when using hot water, greatly improves the comfort level with hot water.Thereby the present invention is based on cistern type water heater's hot water circulating device and method simultaneously, solved the simple cistern type water heater of use in existing circulating technology and carry out circulation time and cannot judge that water tank water temperature causes circulation under water tank low temperature to stop and water tank has little time the problem of heating, can be more effectively energy-conservation.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention is based on cistern type water heater's hot water circulating device;
Fig. 2 is the structural representation of embodiment bis-that the present invention is based on cistern type water heater's hot water circulating device;
Fig. 3 is the flow chart that the present invention is based on cistern type water heater's hot water circuit method;
Fig. 4 is the flow chart of embodiment tetra-that the present invention is based on cistern type water heater's hot water circuit method;
Fig. 5 is the flow chart of embodiment five that the present invention is based on cistern type water heater's hot water circuit method.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Embodiment (one)
Fig. 1 is the structural representation that the present invention is based on cistern type water heater's hot water circulating device, refer to Fig. 1, a kind of hot water circulating device based on cistern type water heater of the present invention, comprise, cistern type water heater 1, and the benefit that adopts cistern type water heater 1 is without the special water heater that is equipped with, and pipeline can be directly connected on the intake-outlet of the cistern type water heater 1 in family, use hot water in water tank, realize good energy-saving effect, one hot water booster pump 2, it is installed on cistern type water heater 1 outlet pipe 12, for providing hydraulic pressure to hot water circulating device, one expansion tank 19, is located on outlet pipe 12, cistern type water heater 1 oral siphon 11 is connected with a return pipe 13 with a feed pipe 14 respectively, return pipe 13 is connected with cistern type water heater's outlet pipe 12, feed pipe 14, oral siphon 11, outlet pipe 12 and return pipe 13 form a water-flow circuit, after starting, booster pump 2 can make water in closed circuit, realize circulation, thereby because can producing volumetric expansion when heating, cistern type water heater 1 cause static hydraulic pressure to increase, booster pump 2 is had a negative impact, and the sound pressure reduction that cistern type water heater 1 water side discharges water when not discharging water is also very large, so the effect that expansion tank 19 can play balancing water pressure is set on water-flow circuit, avoid the excessive damage that causes booster pump 2 or pipeline of hydraulic pressure in closed circuit, one first temperature-sensing probe 9, is arranged on the delivery port of heater for cistern 1, for obtaining the water temperature in cistern type water heater 1, one second temperature-sensing probe 3, is arranged on oral siphon 11, for obtaining the water temperature in hot water circulating device, one controller 8, its respectively with the first temperature-sensing probe 9, the second temperature-sensing probe 3 is connected with booster pump 2, for after booster pump 2 is triggered, judging whether water temperature that the first temperature-sensing probe 9 and the second temperature-sensing probe 3 obtain reaches minute is clipped to preset temperature separately, as reaching its preset temperature data that controller 8 detects according to the second temperature-sensing probe 3, the first temperature-sensing probe 9 controls, otherwise, otherwise controller 8 does not carry out any control, as the second temperature-sensing probe 3 reaches its preset temperature, controller 8 is controlled booster pump 2 and is quit work, otherwise, booster pump 2 continuous firings, the effect reaching is to have guaranteed to have in the situation of hot water in cistern type water heater 1, booster pump 2 just can start, water just can circulate in water-flow circuit, open then cutout cock 7 and trigger booster pump 2, controller 2 is in the situation that the water temperature that the first temperature-sensing probe 9 detects reaches design temperature, receive the data of the second temperature-sensing probe 3, and according to the shutoff of the Data Control booster pump 2 of the second temperature-sensing probe 3 or open, and owing to the object of the invention is to use the interior remaining water of cistern type water heater 1 to carry out circulating-heating, so adopt controller 8 to receive after the data of two temperature-sensing probes looping control, avoided causing not because of water temperature in cistern type water heater the appearance of the circulation situation that cannot stop, use the unfolding mode of trigger-type, the hot water circulating device that makes to the present invention is based on cistern type water heater is energy-conservation, water-saving result is good.
Oral siphon 11 in the present embodiment, feed pipe 14 are connected by a threeway with return pipe 13, are connected and can be realized better sealing, and be easy for installation and removal by threeway.
Feed pipe in the present embodiment is provided with one first check-valves 5, the effect that the first check-valves 5 is set is to prevent in the process of booster pump 2 superchargings, during the interior hot water circuit of closed circuit, there is hot water to flow in feed pipe 14, cause unnecessary waste, return pipe 13 is provided with one second check-valves 6, prevent that the water that feed pipe 14 flows out from flowing directly into cistern type water heater's 1 outlet pipe without oral siphon 11, and then make directly to pass through without the water of heating the appearance of the situations of tap 7 outflows.
On the oral siphon 11 of cistern type water heater 1 in the present embodiment and outlet pipe 12, be respectively provided with an on-off valve 15, be used for controlling the shutoff of cistern type water heater's 1 interior current or opening.
The second temperature-sensing probe 3 in the present embodiment can be arranged on oral siphon 11, so both can play the effect of surveying temperature controlled circulation in water-flow circuit, also can when using hot water, play the effect that cold water temperature keeps booster pump supercharging of surveying.
Embodiment (two)
Fig. 2 is the structural representation of embodiment bis-that the present invention is based on cistern type water heater's hot water circulating device; Refer to Fig. 2, on the basis of embodiment mono-, the hot water circulating device that the present invention is based on cistern type water heater also has timing function, in timing, and the water temperature that the first temperature-sensing probe 9 obtains reaches in the situation of design temperature, and controller 8 judges whether the water temperature that the second temperature-sensing probe 3 obtains reaches a preset temperature, as reach preset temperature, controller 8 is controlled booster pump 2 and is quit work, otherwise, booster pump 2 continuous firings; Timing is generally the rush hour of water, within this time period, first controller judges whether the data of the first temperature-sensing probe 9 reach design temperature, if reach design temperature controller the data of the second temperature-sensing probe 3 are judged, otherwise, do not carry out any operation; The temperature of the second temperature-sensing probe 3 is higher than setting value, and booster pump 2 is not worked, otherwise, booster pump 2 continuous firings; Within this period, user opens tap 7 and just can use immediately hot water, the benefit that increases timing function is to have realized working at times of hot water circulating device, due to peak period, the use of hot water is comparatively frequent, as adopt the speed of trigger-type water outlet not as good as continuous heating pattern, and frequent triggering can not realize well energy-conservation effect, so increased timing function, make to open tap just can use immediately hot water within the timing period, facilitated user the water period is used hot water at any time frequently.
The specific works mode that the present invention is based on cistern type water heater's hot water supercharging EGR is: the in the situation that of setting-up time section not, then the tap of fetching boiling water closes, triggering booster pump is opened, and sending a triggering signal, controller receives the data that start to accept the first temperature-sensing probe and the second temperature-sensing probe after triggering signal, first according to the data of the first temperature-sensing probe, judges, if higher than setting value, according to the data of the second temperature-sensing probe, control, otherwise, do not carry out any operation; If the data that the second temperature-sensing probe detects are lower than setting value booster pump continuous firing, the hot water that cistern type water heater discharges is circulated in closed circuit, reaching setting value after booster pump quits work, circulation stops, and at this moment opens the arbitrary tap being arranged on outlet pipe and can use immediately hot water; In the situation that the first temperature-sensing probe reaches design temperature in the time period of setting, the data that controller continues to detect according to the second temperature-sensing probe are controlled booster pump, whether the water temperature that the second temperature-sensing probe obtains reaches a preset temperature, as reach preset temperature, controller is controlled booster pump and is quit work, otherwise booster pump continuous firing is opened tap and just can be used immediately hot water without waiting within this period.
Embodiment (three)
Fig. 3 is the flow chart that the present invention is based on cistern type water heater's hot water circuit method, refer to Fig. 3, the method of a kind of hot water circuit based on cistern type water heater of the present invention, wherein, comprise: step 101 control system is controlled, step 102 is opened tap, triggers booster pump, triggers a booster pump produce circulating water flow by the tap of fetching boiling water; Tap is opened the water inlet end and the water side that are then closed in booster pump and is produced a pressure differential, realizes and triggering thus; Step 103 is surveyed the first temperature-sensing probe data, step 104 judges by a controller whether the water temperature that the first temperature-sensing probe obtains reaches a preset temperature, as reach preset temperature, step 105 is surveyed the second temperature-sensing probe data, the water temperature that step 106 controller obtains the second temperature-sensing probe judges, judges whether the data that the second temperature-sensing probe detects reach setting value; As reach preset temperature, step 108 supercharging air pump inoperative, otherwise, the supercharging of step 107 booster pump, booster pump continuous firing, until the temperature of the second temperature-sensing probe reaches after setting value, step 108 booster pump stops, circulation stops, and makes to be all full of hot water in whole water-flow circuit, again opens tap and just can use immediately hot water.
Above-mentioned hot water circuit method, wherein, any time first desired temperature that detects of temperature-sensing probe lower than design temperature control panel control booster pump and quit work, guarantee after in cistern type water heater, hot water temperature is lower than setting value to stop in time supercharging, avoid booster pump continuous firing to cause the waste of the energy, the hot water circulating device that at this moment the present invention is based on cistern type water heater is equivalent to one without the water tank type water outlet device circulating without supercharging.
Embodiment (four)
Fig. 4 is the flow chart of embodiment tetra-that the present invention is based on cistern type water heater's hot water circuit method, refer to Fig. 4, on the basis of embodiment tri-, the hot water circuit method that the present invention is based on cistern type water heater also comprises: the continuous heating time is set in controller, step 101 control system is controlled, step 120 starts timing function, step 122 is set the period, at this continuous heating in the time, step 131 is surveyed the first temperature-sensing probe data, the data of step 132 pair the first temperature-sensing probe judge, lower than setting value, do not carry out any operation, if survey the second temperature-sensing probe data higher than setting value step 133, step 134 judges by a controller whether the water temperature that the second temperature-sensing probe obtains reaches a preset temperature, as reach preset temperature, step 135 controller is controlled booster pump and is quit work, otherwise, step 134 booster pump continuous firing, until stop after reaching design temperature, the continuous heating time is set makes that user can the period can continuous heating comparatively frequently at water, in period beyond this period, user can open at any time tap and trigger hot water.
Embodiment (five)
Fig. 5 is the flow chart of embodiment five that the present invention is based on cistern type water heater's hot water circuit method, refer to Fig. 5, on the basis of embodiment tri-and embodiment tetra-, the hot water circuit method that the present invention is based on cistern type water heater also comprises: step 141 continues to use hot water by the tap of fetching boiling water, step 142 is surveyed the first temperature-sensing probe data, step 143 judges that by a controller whether water temperature that the first temperature-sensing probe obtains is higher than a preset temperature, as higher than preset temperature, the water temperature that step 144 controller obtains the second temperature-sensing probe judges, otherwise, do not carry out any operation, step 144 controller starts to receive the data of the second temperature-sensing probe, the cold water of flowing through continues to enter heater for cistern, step 145 controller judges whether the water temperature that the second temperature-sensing probe obtains reaches a preset temperature, as does not reach preset temperature, and step 146 controller is controlled described booster pump continuous firing, as reaches, and step 147 controller is controlled booster pump and quit work.
The situation of heating at times the present invention is based in cistern type water heater's hot water circuit method is specially: step 101 control system is controlled, step 120 starts the timing function in control system, period is distinguished, step 121 enters triggering heating mode in the non-setting period, and step 122 is set in the period and entered continuous heating pattern.
In sum, the hot water circulating device and the method that the present invention is based on cistern type water heater have solved the water resource waste causing without circulation in prior art and have gone out water speed slow, and the problem of the energy waste that causes of existing circulatory system continuous heating, add return pipe to make device there is circulatory function, without discharging cold water, can directly use hot water, and be provided with timing function and can in setting-up time, heat, all the other time period internal triggers heating, realize energy-conservation, the double effects of water saving.The present invention can also realize Automatic-boosting when using hot water, greatly improves the comfort level with hot water.Thereby the present invention is based on cistern type water heater's hot water circulating device and method simultaneously, solved the simple cistern type water heater of use in existing circulating technology and carry out circulation time and cannot judge that water tank water temperature causes circulation under water tank low temperature to stop and water tank has little time the problem of heating, can be more effectively energy-conservation.
Above-described embodiment is only giving an example of alternative embodiment of the present invention, and its related feature is only for illustrating and set forth technical scheme of the present invention, the protection domain being not intended to limit the present invention.The invention is not restricted to above-described embodiment, can change in many ways or improve.

Claims (6)

1. the hot water circulating device based on cistern type water heater, comprises, cistern type water heater is characterized in that, a hot water booster pump, and it is installed on described cistern type water heater's outlet pipe, for the water extraction to hot water circulating device, supplies hydraulic pressure, one expansion tank, is arranged on described outlet pipe, one first temperature-sensing probe, is arranged on the delivery port of described heater for cistern, for obtaining the water temperature in cistern type water heater, one second temperature-sensing probe, is arranged on described cistern type water heater's oral siphon, for obtaining the water temperature in hot water circulating device, one return pipe, is connected with described outlet pipe, one feed pipe, is connected with described oral siphon, described return pipe by a threeway, one first check-valves, is arranged on described feed pipe, for preventing that described booster pump from having hot water to flow in described feed pipe in the process of supercharging, one second check-valves, is arranged on described return pipe, for preventing that the water that described feed pipe flows out from flowing directly into described outlet pipe without described oral siphon, one controller, its respectively with described the first temperature-sensing probe, the second temperature-sensing probe is connected with described booster pump, for after booster pump is triggered, judge whether the water temperature that the first temperature-sensing probe and the second temperature-sensing probe obtain reaches respectively the first preset temperature and the second preset temperature, any time first water temperature that detects of temperature-sensing probe lower than the 3rd preset temperature of described the first temperature-sensing probe described controller control described booster pump and quit work, as the first temperature-sensing probe reach the first preset temperature controller receive the water temperature data that the second temperature-sensing probe detects, as the second temperature-sensing probe reaches the second preset temperature, described controller is controlled described booster pump and is quit work, otherwise, described booster pump continuous firing.
2. hot water circulating device according to claim 1, it is characterized in that, described controller also has timing function, in timing, and the water temperature that the first temperature-sensing probe obtains reaches in the situation of described the first preset temperature, the second preset temperature as described in the water temperature of obtaining as the second temperature-sensing probe does not reach, described controller is controlled described booster pump continuous firing, the second preset temperature as described in the water temperature of obtaining as the second temperature-sensing probe reaches, described controller is controlled described booster pump and is quit work.
3. hot water circulating device according to claim 1, is characterized in that, on described oral siphon and described outlet pipe, is respectively provided with an on-off valve.
4. the hot water circuit method based on hot water circulating device as claimed in claim 1, is characterized in that, comprising: by the tap of fetching boiling water, trigger a booster pump and produce circulating water flow; By a controller, judge whether the water temperature that the first temperature-sensing probe obtains reaches the first preset temperature, any time first, the water temperature that detects of temperature-sensing probe was lower than the 3rd preset temperature of described the first temperature-sensing probe, controller control booster pump quits work, as reach the first preset temperature, the water temperature that controller obtains the second temperature-sensing probe judges, otherwise, do not carry out any operation; Controller judges whether the water temperature that the second temperature-sensing probe obtains reaches the second preset temperature, as reaches the second preset temperature, and controller is controlled described booster pump and quit work, otherwise, described booster pump continuous firing.
5. hot water circuit method according to claim 4, it is characterized in that, also comprise: the continuous heating time is set in described controller, at this continuous heating in the time, and the water temperature that the first temperature-sensing probe detects reaches in the situation of the first preset temperature, by a controller, judges whether the water temperature that the second temperature-sensing probe obtains reaches the second preset temperature, as reach the second preset temperature, controller is controlled described booster pump and is quit work, otherwise, described booster pump continuous firing.
6. hot water circuit method according to claim 4, it is characterized in that, comprise: by the tap of fetching boiling water, continue to use hot water, by a controller, judge that whether water temperature that the first temperature-sensing probe obtains is higher than the first preset temperature, as higher than the first preset temperature, the water temperature that controller obtains the second temperature-sensing probe judges, otherwise, do not carry out any operation; Controller starts to receive the data of the second temperature-sensing probe; The cold water of flowing through continues to enter heater for cistern; Described controller judges whether the water temperature that the second temperature-sensing probe obtains reaches the second preset temperature, as does not reach the second preset temperature, and controller is controlled booster pump continuous firing described in described booster pump, as reaches, and controller is controlled booster pump and quit work.
CN201010500916.5A 2010-10-09 2010-10-09 Device and method for hot water circulation based on water tank type water heater Expired - Fee Related CN102444931B (en)

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CN102444931B true CN102444931B (en) 2014-12-10

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107091495B (en) * 2017-04-24 2019-12-06 广东美的暖通设备有限公司 hot water system control method, hot water system, and computer-readable storage medium

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CN201463106U (en) * 2009-08-06 2010-05-12 上海岭北冷暖设备工程有限公司 Supercharged hot water circulating device
CN201517815U (en) * 2009-09-18 2010-06-30 上海岭北冷暖设备工程有限公司 Supercharged hot-water circulating device of automatic switchover water heater

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20120156U1 (en) * 2000-12-13 2002-04-04 Raese Holger Control device for hot water circulation pumps
JP2004019967A (en) * 2002-06-13 2004-01-22 Toto Ltd Electric water heater
JP2006010172A (en) * 2004-06-24 2006-01-12 Matsushita Electric Works Ltd Hot water storage type hot water supply system
CN101266062A (en) * 2007-03-13 2008-09-17 黄瑞宗 Hot-water supplying system
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