CN215675777U

CN215675777U - Gas water heater

Info

Publication number: CN215675777U
Application number: CN202122056855.4U
Authority: CN
Inventors: 黄伟锋; 林玉绵; 赖煜华; 李凯; 高德伟
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2022-01-28
Anticipated expiration: 2031-08-27

Abstract

The utility model discloses a gas water heater, which comprises a water inlet pipeline, wherein the water inlet pipeline is connected with a heat exchange device, the heat exchange device is electrically connected with a controller, the heat exchange device is provided with a cooling channel and a heating channel in parallel, the cooling channel and the heating channel are respectively communicated with a water mixing tank, a water outlet pipeline is arranged on the water mixing tank, water flowing into the water inlet pipeline flows to the heat exchange device, the controller controls the heat exchange device to heat the water to a set sterilization temperature, and the sterilized water flows into the water mixing tank through the cooling channel and/or the heating channel to be cooled and then flows out from the water outlet pipeline. The gas water heater provided by the utility model can effectively sterilize the domestic water, so that the water quality of a user is improved; the sterilized high-temperature water can meet the domestic water requirement of a user through rapid constant temperature.

Description

Gas water heater

Technical Field

The utility model belongs to the technical field of gas water heaters, and particularly relates to a gas water heater.

Background

With the improvement of the quality of life of modern people, the concept of healthy bathing is more and more pursued by consumers, and the healthy bathing requires proper water temperature output by a water heater and further considers the water quality condition of bathing water.

At present, the proper bathing water temperature is generally about 42 ℃, but the temperature can not realize the sterilization function, so the used water output from the water heater contains a large amount of bacteria, and most of the gas water heaters sold in the market at present can not meet the requirement of healthy bathing after the water temperature is heated according to the set temperature. Only a few gas water heaters have a sterilization function, and heat hot water to 100 ℃ for sterilization, but the sterilized boiling water needs to be cooled to meet the bathing requirements of users. The existing sterilized boiling water is cooled by a cold water heat exchange device. The cooling mode directly heats cold water in the sterilized water to mix the sterilized water and the cold water, and whether the mixed warm water is in a complete sterilization state cannot be guaranteed. The existing sterilized boiling water can be cooled by other cooling devices, and the energy is wasted by the cooling mode.

Therefore, it is urgently needed to provide a gas water heater to solve the problem that the existing gas water heater not only has a sterilization function, but also can timely cool the sterilized boiling water, so as to meet different water requirements of users.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a gas water heater, which can quickly keep constant temperature after sterilization so as to meet different water requirements of users.

In order to achieve the purpose, the specific technical scheme of the gas water heater is as follows:

the utility model provides a gas water heater, including the water inlet pipe, the water inlet pipe is connected with heat transfer device, the heat transfer device electricity is connected with the controller, heat transfer device connects in parallel and sets up cooling channel and intensification passageway, cooling channel and intensification passageway communicate respectively and mix the water pitcher, mix and be provided with outlet conduit on the water pitcher, rivers that flow in the water inlet pipe are to heat transfer device, controller control heat transfer device with water heating to the temperature of disinfecting of settlement, the water after disinfecting flows in mixing the water pitcher through cooling channel and/or intensification passageway and cools down, and then flows from outlet conduit.

Further, the heat exchange device comprises a first heat exchanger and a burner, and the controller controls the burner to be started to heat the water in the first heat exchanger to the sterilization temperature.

Furthermore, the cooling channel comprises at least one second heat exchanger and a first hot water pipeline, the first hot water pipeline is communicated with the first heat exchanger, the at least one second heat exchanger is respectively communicated with the water inlet pipeline and the water mixing tank, and cold water flowing into the at least one second heat exchanger through the water inlet pipeline and sterilized hot water are mixed and then flow into the water mixing tank.

Furthermore, the second heat exchanger includes a plurality of, and a plurality of second heat exchangers are parallelly connected to be set up, and the water intake pipe links to each other with the second heat exchanger that is close to the water intake pipe setting respectively with mixing the water jar, and first heat exchanger links to each other with the second heat exchanger that is close to first hot water pipeline setting respectively with first hot-water line.

Furthermore, a cold water channel and a hot water channel are arranged in the second heat exchanger, the cold water channel and the hot water channel are arranged in an S shape, and the outer walls of the cold water channel and the hot water channel are in contact with each other, so that water heat exchange is carried out in the cold water channel and the hot water channel.

Furthermore, a cold water channel and a hot water channel are arranged in the second heat exchange channel, and the hot water channel is hermetically arranged in the cold water channel, so that the cold water in the cold water channel and the hot water in the hot water channel exchange heat.

Furthermore, the temperature rising channel comprises a second hot water pipeline, the second hot water pipeline is communicated with the first heat exchanger, and the sterilized hot water in the first heat exchanger flows into the water mixing tank through the second hot water pipeline.

Furthermore, a flow meter is arranged on the water inlet pipeline, a first temperature sensor is arranged on a connecting pipeline between the first heat exchanger and the second heat exchanger, a second temperature sensor is arranged on a connecting pipeline between the first heat exchanger and the first hot water pipeline, and the combustion firepower of the flow control combustor of water measured by the flow meter and the temperature difference value detected by the first temperature sensor and the second temperature sensor are measured.

Furthermore, a first regulating valve is arranged on the first hot water pipeline, a second regulating valve is arranged on the second hot water pipeline, and the opening degrees of the first regulating valve and the second regulating valve are regulated according to the use temperature set by a user.

Further, a third temperature sensor is arranged on the water outlet pipeline and used for detecting the temperature of water.

The gas water heater provided by the utility model has the following advantages: the domestic water is effectively sterilized, and the water quality of a user is improved; the sterilized high-temperature water can meet the domestic water requirement of a user through rapid constant temperature.

Drawings

FIG. 1 is a schematic structural view of a first embodiment of a gas water heater of the present invention;

FIG. 2 is a schematic diagram of a second heat exchanger according to the present invention;

FIG. 3 is a schematic view of the internal structure of a first embodiment of a second heat exchanger according to the present invention;

FIG. 4 is a schematic diagram of a cold water channel structure of a second heat exchanger according to the present invention;

FIG. 5 is a schematic diagram of a hot water passage structure of a second heat exchanger according to the present invention;

FIG. 6 is a schematic diagram of the internal structure of a second embodiment of a second heat exchanger according to the present invention;

FIG. 7 is a schematic diagram of a cold water channel structure of a second embodiment of the second heat exchanger of the present invention;

FIG. 8 is a schematic diagram of a hot water passageway according to a second embodiment of the second heat exchanger of the present invention;

FIG. 9 is a schematic structural view of the water mixing tank of the present invention;

FIG. 10 is a schematic structural view of a second embodiment of the gas water heater of the present invention;

fig. 11 is a schematic structural view of a gas water heater according to a third embodiment of the present invention.

Description of the drawings: 1. a water flow sensor; 2. a water inlet pipeline; 3. a second heat exchanger; 31. a second body; 32. a cold water inlet; 33. a cold water outlet; 34. a hot water inlet; 35. a hot water outlet; 36. a cold water passage; 37. a hot water passage; 4. connecting a pipeline; 5. a first heat exchanger; 6. a burner; 7. a first hot water pipe; 8. a second hot water pipe; 9. a first water regulating valve; 10. a third hot water pipe; 11. a second water regulating valve; 12. a water mixing tank; 121. a first body; 122. a first water inlet; 123. a second water inlet; 124. a water outlet; 125. a third temperature sensor; 13. a first temperature sensor; 14. a second temperature sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be noted that the terms "center", "upper", "lower", and "upper" are used for the purpose of describing the present invention,

The directional or positional relationships indicated by "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the directional or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The gas water heater of the present invention will be described with reference to fig. 1 to 11.

The existing gas water heater reduces the temperature of the sterilized wastewater to the domestic water required by a user through cooling after the cold water flowing into the cold water end is sterilized at high temperature, and the cooling mode is complex in process, needs to consume other energy and reduces the user experience.

As shown in fig. 1, the gas water heater provided by the utility model comprises a first heat exchanger 5, a second heat exchanger 3, a burner 6 and a water mixing tank 12, wherein cold water passes through the first heat exchanger 5, the burner 6 heats the first heat exchanger 5 to heat water in the first heat exchanger 5 to a sterilization temperature, heated high-temperature water flows into the water mixing tank 12 through the temperature reduction of the second heat exchanger 3, and a user takes the cooled warm water through the water mixing tank 12 to meet the requirement of domestic water of the user.

Further, a burner 6 is arranged below the first heat exchanger 5, the burner 6 heats water in the first heat exchanger 5, the burner 6 is electrically connected with a controller, and the controller controls the fire power of the burner 6 according to the temperature of the water.

Further, a flow meter is arranged on the water inlet pipeline 2, a first temperature sensor 13 is arranged on a connecting pipeline 4 between the first heat exchanger 5 and the second heat exchanger 3, a second temperature sensor 14 is arranged on a connecting pipeline 4 between the first heat exchanger 5 and the first hot water pipe 7, and the combustion firepower of the combustor 6 is controlled through the temperature difference value detected by the first temperature sensor 13 and the second temperature sensor 14 and the flow rate of water measured by the flow meter.

As shown in fig. 2 to 5, showing a specific structural schematic diagram of a first embodiment of the second heat exchanger 3, the second heat exchanger 3 mainly functions to exchange heat between hot water flowing into the first heat exchanger 5 and cold water flowing into the cold water end, and transfer the temperature of the hot water to the cold water, so that the hot water is cooled and the cold water is heated, and at this time, the sterilized hot water is cooled through the cold water, and the cold water is heated and sterilized.

Further, the second heat exchanger 3 includes a second body 31, a cold water inlet 32, a cold water outlet 33, a hot water inlet 34, and a hot water outlet 35 are provided on a side wall of the second body 31, a cold water channel 36 and a hot water channel 37 are provided in the second body 31, the cold water channel 36 and the hot water channel 37 are respectively and independently sealed, hot water and cold water are not mixed, and sterilized hot water and sterilized cold water are prevented from being mixed, so that bacteria are mixed into the sterilized hot water.

As shown in fig. 3, the cold water passage 36 and the hot water passage 37 provided in the second body 31 are serpentine passages, and the cold water passage 36 communicates with the cold water inlet 32 and the hot water inlet 34, respectively, and the cold water inlet 32 and the hot water inlet 34 are provided on opposite side walls of the second body 31, respectively. The hot water channel 37 is respectively communicated with the hot water inlet 34 and the hot water outlet 35, the hot water inlet 34 and the hot water outlet 35 are respectively arranged on two opposite side walls of the second body 31, and the outer wall of the pipeline of the hot water channel 37 is contacted with the outer wall of the pipeline of the cold water channel 36, so that the outer wall of the pipeline of the cold water channel 36 is closely contacted with the outer wall of the pipeline of the hot water channel 37, the heat exchange effect is increased, and the heat of the high-temperature water in the hot water channel 37 is transferred into the cold water channel 36 to the greatest extent.

Further, cold water flows into the cold water inlet 32 and passes through the cold water channel 36, and sterilized high-temperature water flows into the hot water inlet 34, and at the moment, the cold water in the cold water channel 36 and the hot water in the hot water channel 37 exchange heat, so that the temperature transfer change rates of the hot water and the cold water are the same.

Specifically, 100 ℃ boiling water and 20 ℃ cold water are mixed, the temperature of the boiling water is reduced to 60 ℃ after mixing, and the temperature of the cold water is increased to 60 ℃, so that the number of the second heat exchangers 3 can be controlled according to the user temperature of a user to reduce the temperature of the sterilized water so as to meet the water temperature of the user.

Preferably, the housing of the second heat exchanger 3 is made of metal casting, such as aluminum, copper, stainless steel, etc., the pipeline of the cold water channel 36 and the pipeline of the hot water channel 37 are disposed in the housing, and the gap of the housing is filled with thermal insulation material to reduce heat dissipation.

As shown in fig. 6 to 8, which show a specific structural schematic diagram of a second embodiment of the second heat exchanger 3, a cold water channel 36 and a hot water channel 37 inside the second heat exchanger 3 are sealed and arranged independently of each other, and a cold water inlet 32, a cold water outlet 33, a hot water inlet 34 and a hot water outlet 35 are arranged on a body of the second heat exchanger 3 and respectively communicate with the hot water channel 37 and the cold water channel 36. The cold water flows through the cold water channel 36 and the hot water flowing through the hot water channel 37 to exchange heat, so that the hot water cooling and the cold water heating are realized, the energy is saved, and the sterilized high-temperature water can be cooled.

As shown in fig. 7 and 8, the structural schematic diagrams of the cold water channel 36 and the hot water channel 37 are shown in the figures, the pipeline of the cold water channel 36 is sleeved on the outer wall of the pipeline of the hot water channel 37, preferably, the pipeline of the cold water channel 36 may be set to be circular, oval, or the like, the pipeline of the hot water channel 37 may be set to be diamond, square, triangular, or the like, as long as the pipeline of the cold water channel 36 is sleeved on the outer wall of the pipeline of the hot water channel 37, and no specific limitation is made herein.

As shown in fig. 9, the hot water cooled by the second heat exchanger 3 flows to the water mixing tank 12, the wedding hall comprises a first body 121, a first water inlet 122 is formed in the first body 121, and the first water inlet 122 is connected with the hot water outlet 35 of the second heat exchanger 3, so that the hot water cooled by the second heat exchanger 3 flows to the water mixing tank 12 through the third hot water pipe 10. Be provided with second water inlet 123 on first body 121, second water inlet 123 and second hot-water line 8 link to each other, the hot water part after the sterilization does not flow through the cooling of second heat exchanger 3, the hot-water flow after some sterilization is to mixing in water jar 12, if the not satisfied user's of the hot water after the hot water cooling in the second heat exchanger 3 temperature, the hot-water after the hot-water flow in the control second hot-water line 8 mixes through the hot-water after mixing water jar 12 and the cooling of second heat exchanger 3, make the temperature of the water after mixing be greater than the hot water temperature after the cooling of second heat exchanger 3, in order to satisfy user's user demand.

Furthermore, a first regulating valve is arranged on the 7-way of the first hot water pipe, a second regulating valve is arranged on the 8-way of the second hot water pipe, and the opening degrees of the first regulating valve and the second regulating valve are regulated according to the use temperature set by a user.

Further, the second body 31 is further provided with a water outlet 124, the water outlet 124 is provided with a third temperature sensor 125, the third temperature sensor 125 is used for detecting the temperature at the water inlet 124, and the working states of the first heat exchanger 5 and the second heat exchanger 3 are controlled by detecting the temperature at the water inlet 124, so that the temperature of the water flowing out of the water outlet 124 meets the requirements of users.

The gas water heater provided by the utility model can control the combustion firepower of the burner 6, the number of the first heat exchangers 5 and the water flow of the second hot water pipe 8 according to the water outlet temperature set by a user by the controller so as to convey water with the water outlet temperature set by the user, so that the use degree of the user is improved, energy is saved, and the safety of water use of the user is improved.

The specific working process of the gas water heater provided by the utility model is as follows:

an external water source flows into the water inlet pipeline 2 through the water flow sensor 1, flows through the cold water inlet 32 and the cold water outlet 33 of the first heat exchanger 5, flows through the connecting pipeline 4, flows into the main body of the second heat exchanger 3 for heat exchange, and the controller receives signals of the water flow sensor 1 to control the combustor 6 to ignite and burn. At this time, the amount of activity of the burner 6 is estimated based on the water flow rate of the water inlet pipe 2 and the temperature difference detected by the first temperature sensor 13 and the second temperature sensor 14, and a signal is transmitted to the burner 6 to control the amount of thermal power of the burner 6.

Furthermore, the cold water flowing through the first heat exchanger 5 is heated to become 100 ℃ boiling water, the 100 ℃ boiling water flows out of the first heat exchanger 5 and then flows through two branches, one branch flows through the first water regulating valve of the first hot water pipe 7 and then enters the second heat exchanger 3 to exchange heat with the cold water, at this time, the boiling water is cooled to be low-temperature water at 100 ℃, and the cooled water flows through the water mixing tank 12. The boiling water of 100 ℃ in the other branch flows through the water mixing tank 12 through the second hot water tank and the second water regulating valve 11. The water flows with different temperatures in the two branches pass through the water mixing tank 12, are mixed and neutralized, and then flow out from the water outlet 124.

Specifically, the first water regulating valve 9 functions to control the flow rate of boiling water when heat exchange is performed with cold water. The second water regulating valve 11 is used for controlling the flow of boiling water entering the water mixing tank 12, and the final outlet water temperature is regulated by controlling the flow of the two water flow channels, so that the constant temperature function is realized.

When the constant heat function is realized, the controller also adjusts the size of combustion firepower according to the temperature of water entering the first heat exchanger 5, and the controller is matched with the opening proportion of the two water regulating valves to realize the accurate constant temperature function together.

Specifically, the gas water heater is started, cold water (for example, 20 ℃) enters the second heat exchanger 3, and the temperature of the second heat exchanger 3 is close to that of the cold water, so that the cold water is not heated after passing through the second heat exchanger 3, and then flows to the first heat exchanger 5. At this time, knowing the water flow data and the cold water temperature, the controller calculates the energy required for heating to 100 ℃ at 20 ℃ under the flow state, calculates how much (liter) of gas is used to meet the requirement, and calculates how large (square millimeter) gas channel is opened to meet the requirement. After the burner 6 has burned this amount of gas, the cold water can be heated to 100 ℃.

Further, the controller adjusts the working states of the first water regulating valve 9 and the second water regulating valve 11 according to the set outlet water temperature of the user, when the set outlet water temperature is less than X ℃, the first water regulating valve 9 is fully opened, the second water regulating valve 11 is closed, the boiling water enters the second heat exchanger 3, after passing through the second heat exchanger 3, the boiling water is cooled to 60 ℃ warm water (the calculation formula is (100 ℃) + cold water temperature)/2), and then after passing through the other second heat exchanger 3, the 60 ℃ warm water is cooled to 40 ℃ water (the calculation formula is (60 ℃ + cold water temperature)/2), and the cooling method is popularized like the above. The last low-temperature water flows into the water mixing tank 12 and then flows out of the gas water heater from the water mixing tank 12. When the boiling water is cooled continuously, the water entering the first heat exchanger 5 is changed into warm water from the cold water which is just started, at the moment, the controller can recalculate the energy required by the warm water-to-boiling water, and readjust the consumption of the fuel gas, so that the stability of the water outlet temperature is ensured, and the constant temperature effect of the water heater is ensured.

Further, when the user improves the water temperature, the controller can increase the gas consumption, and after the gas was increaseed to a definite value, the controller can open second water transfer valve 11 to according to current state, adjust gas volume size simultaneously, first water transfer valve 9 size, second water transfer valve 11 size, realize that leaving water temperature satisfies the requirement of design temperature.

As shown in fig. 10, which illustrates a schematic structural diagram of a second embodiment of the gas water heater provided by the present invention, the temperature reduction channel includes at least one

second heat exchanger

3 and 7 first hot water pipes, the 7 first hot water pipes are communicated with the 5 first heat exchanger, the at least one second heat exchanger 3 is respectively communicated with the water inlet pipeline 2 and the water mixing tank 12, and the cold water flowing into the at least one second heat exchanger 3 from the water inlet pipeline 2 and the sterilized hot water are mixed and then flow into the water mixing tank 12. The second heat exchangers 3 comprise a plurality of second heat exchangers 3 which are arranged in parallel, the water inlet pipeline 2 and the water mixing tank 12 are respectively connected with the second heat exchangers 3 which are arranged close to the water inlet pipeline 2, and the first heat exchangers 5 and the first hot water pipes 7 are respectively connected with the second heat exchangers 3 which are arranged close to the first hot water pipes 7. The plurality of second heat exchangers 3 are arranged in parallel to reduce the temperature of hot water in the channel, so that the lower limit of the temperature of the hot water is set to be in a lower temperature range, and the water temperature control range is wider.

As shown in fig. 11, a schematic structural diagram of a third embodiment of the gas water heater provided by the present invention is shown, the gas water heater includes a plurality of second heat exchangers 3, the arrangement manner of the plurality of second heat exchangers 3 is different from that of the second embodiment, and other structures are the same, which is not described herein again.

The gas water heater provided by the utility model can effectively sterilize domestic water and improve the water quality of users; the sterilized high-temperature water can meet the domestic water requirement of a user through rapid constant temperature.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides a gas water heater, a serial communication port, including the water intake pipe, the water intake pipe is connected with heat transfer device, the heat transfer device electricity is connected with the controller, heat transfer device connects in parallel and sets up cooling channel and intensification passageway, cooling channel and intensification passageway communicate respectively and mix the water pitcher, mix and be provided with water outlet pipe way on the water pitcher, rivers that flow in the water intake pipe are to heat transfer device, controller control heat transfer device with water heating to the temperature of disinfecting of settlement, the water after disinfecting flows in mixing the water pitcher through cooling channel and/or intensification passageway and cools down, and then flow from water outlet pipe way.

2. The gas water heater of claim 1, wherein the heat exchange device includes a first heat exchanger and a burner, and the controller controls the burner to be activated to heat water in the first heat exchanger to a sterilization temperature.

3. The gas water heater of claim 2, wherein the cooling channel comprises at least one second heat exchanger and a first hot water pipeline, the first hot water pipeline is communicated with the first heat exchanger, the at least one second heat exchanger is respectively communicated with the water inlet pipeline and the water mixing tank, and cold water flowing into the at least one second heat exchanger from the water inlet pipeline and sterilized hot water are mixed and then flow into the water mixing tank.

4. The gas water heater of claim 3, wherein the second heat exchanger comprises a plurality of second heat exchangers arranged in parallel, the water inlet pipeline is connected with the water mixing tank and the second heat exchangers arranged close to the water inlet pipeline respectively, and the first heat exchanger is connected with the first hot water pipe and the second heat exchangers arranged close to the first hot water pipe respectively.

5. The gas water heater of claim 3 or 4, wherein the second heat exchanger is provided with a cold water channel and a hot water channel, the cold water channel and the hot water channel are arranged in an S shape, and outer walls of the cold water channel and the hot water channel are in contact with each other to exchange water heat in the cold water channel and the hot water channel.

6. The gas water heater of claim 3 or 4, wherein a cold water channel and a hot water channel are arranged in the second heat exchanger, and the hot water channel is sealed in the cold water channel, so that the cold water in the cold water channel and the hot water in the hot water channel exchange heat.

7. The gas water heater of claim 3, wherein the warming channel comprises a second hot water pipeline, the second hot water pipeline is communicated with the first heat exchanger, and the sterilized hot water in the first heat exchanger flows into the water mixing tank through the second hot water pipeline.

8. The gas water heater of claim 7, wherein a flow meter is provided on the water inlet line, a first temperature sensor is provided on a connection line between the first heat exchanger and the second heat exchanger, a second temperature sensor is provided on a connection line between the first heat exchanger and the first hot water line, and the combustion power of the burner is controlled by a temperature difference detected by the first temperature sensor and the second temperature sensor and a flow rate of water measured by the flow meter.

9. The gas water heater of claim 7, wherein a first regulating valve is provided on the first hot water line, a second regulating valve is provided on the second hot water line, and the opening degrees of the first regulating valve and the second regulating valve are adjusted according to a use temperature set by a user.

10. The gas water heater of claim 1, wherein a third temperature sensor is disposed on the water outlet line, the third temperature sensor being configured to detect a temperature of water.