CN111442520A - water heater - Google Patents

Abstract

The present invention provides a water heater. The water heater includes a water mixing valve, a water storage tank and a heating element. The water mixing valve has a first inlet, a second inlet and an outlet that communicate with each other; the hot water flows into the mixing valve through the first inlet, and flows out of the water outlet of the water heater from the outlet. . One end of the water storage tank is connected to the water inlet of the water heater, and the other end of the water storage tank is connected to the second inlet through the first control valve. The heating element is arranged on the water storage tank, and the heating element is used to heat the water in the water storage tank, so that the temperature of the water in the water storage tank is greater than the first preset temperature. A first temperature sensor is arranged at the first inlet, and when the temperature detected by the first temperature sensor is lower than the first preset temperature, the first control valve is opened. Therefore, when the water heater is turned on, the water temperature at the first inlet is lower than the first preset temperature, and hot water with a higher temperature can be injected into the second inlet of the water mixing valve through the water storage tank to increase the water outlet temperature of the water heater. Avoid too low temperatures.

Description

water heater

technical field

The invention relates to the technical field of water heaters, in particular to a water heater.

Background technique

A gas water heater is a common household appliance that uses the heat generated by combustion to heat cold water, thereby providing people with water at a suitable temperature.

In the related art, the gas water heater includes a combustion chamber and a heat exchange tube wound outside the combustion chamber. Cold water enters from the heat exchange tube, absorbs the heat generated by the combustion chamber to form hot water, and then flows out from the water outlet pipe of the water heater to the water equipment.

However, when the gas water heater is turned on, the water temperature is low, which affects the use experience.

SUMMARY OF THE INVENTION

The present invention provides a water heater to overcome the problem of low water temperature when the water heater is turned on in the related art.

The invention provides a water heater, comprising: a water mixing valve, a water storage tank and a heating element.

The water mixing valve has a first inlet, a second inlet and an outlet that communicate with each other; hot water flows into the water mixing valve through the first inlet, and flows out of the water outlet of the water heater from the outlet.

One end of the water storage tank is connected to the water inlet of the water heater, and the other end of the water storage tank is connected to the second inlet through the first control valve.

The heating element is arranged on the water storage tank, and the heating element is used for heating the water in the water storage tank, so that the temperature of the water in the water storage tank is greater than the first preset temperature.

A first temperature sensor is disposed at the first inlet, and when the temperature detected by the first temperature sensor is lower than the first preset temperature, the first control valve is opened.

In the above water heater, a second temperature sensor is provided at the outlet; when the temperature detected by the second temperature sensor is greater than or equal to a first preset temperature, the first control valve is closed.

The above water heater, wherein the water heater includes a water outlet pipe, the water outlet pipe includes a first section and a second section, the first section is connected to the first inlet, and one end of the second section is connected to the The outlet is connected, and the other end of the second section constitutes the water outlet.

The first temperature sensor is connected to the first segment, and the second temperature sensor is connected to the second segment.

The water heater as described above, wherein the water storage tank is provided with a third temperature sensor; when the temperature detected by the third temperature sensor is lower than the second preset temperature, the heating element heats the water storage tank and the second preset temperature is greater than the first preset temperature.

The water heater as described above, wherein the heating element is arranged in the water storage tank.

The above water heater, wherein the heating element is covered outside the water storage tank.

The water heater as described above, wherein the water heater further comprises a controller.

The controller is connected to the first temperature sensor and the first control valve; the controller is configured to control the first control when the temperature detected by the first temperature sensor is lower than a first preset temperature The valve is open.

The water heater as described above, wherein the controller is further connected to the second temperature sensor, and the controller is configured to control the temperature when the temperature detected by the second temperature sensor is greater than or equal to a first preset temperature The first control valve is closed.

The water heater as described above, wherein a second control valve is provided between the water storage tank and the water inlet, the controller is connected to the second control valve, and the controller is used for when the water storage tank is When the water level in the tank is lower than the preset water level, the second control valve is controlled to open.

The water heater as described above, wherein the water heater includes a casing, and the water mixing valve and the water storage tank are arranged in the casing.

The water heater provided by the present invention is provided with a water mixing valve, a water storage tank and a heating element. The water mixing valve has a first inlet, a second inlet and an outlet that communicate with each other; hot water flows into the water mixing valve through the first inlet, and flows out of the water outlet of the water heater from the outlet. One end of the water storage tank is connected to the water inlet of the water heater, and the other end of the water storage tank is connected to the second inlet through the first control valve. The heating element is arranged on the water storage tank, and the heating element is used to heat the water in the water storage tank, so that the temperature of the water in the water storage tank is greater than the first preset temperature. A first temperature sensor is arranged at the first inlet, and when the temperature detected by the first temperature sensor is lower than the first preset temperature, the first control valve is opened. Therefore, when the water heater is turned on, the water temperature of the first inlet is lower than the first preset temperature, and hot water with a higher temperature can be injected into the second inlet of the water mixing valve through the water storage tank, and the water flow of the first inlet and the second inlet The water flow at the inlet is mixed, which can increase the temperature of the water at the water outlet of the water heater, avoiding the temperature being too low and affecting the user experience. Since the water mixing valve is close to the water outlet, it can be quickly adjusted and the water temperature can be adjusted well. In addition, the water heater provided by the embodiment of the present invention can not only adjust the water temperature when the water heater is turned on, but also can be used in a scenario where the water temperature suddenly decreases due to water pressure fluctuations. In addition, since the water heater is in a stable working state, its water temperature can basically be maintained at a constant first preset temperature. Therefore, the adjustment time for the water temperature is roughly when it is just turned on, or when the water pressure fluctuates, and the overall adjustment time is not long. The water volume is also small, and the volume of the water storage tank is small, so that the water temperature can be quickly adjusted while avoiding the excessive volume of the water heater.

Description of drawings

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and the present invention is not limited to the following specific embodiments.

1 is a schematic structural diagram of a water heater in an embodiment of the present invention;

Fig. 2 is the first structural representation of the water storage tank in Fig. 1;

FIG. 3 is a schematic diagram of a second structure of the water storage tank in FIG. 1 .

Description of reference numbers:

100: water mixing valve;

110: the first entrance;

120: the second entrance;

130: export;

200: water storage tank;

300: water inlet pipe;

400: the first control valve;

500: heating element;

600: the first temperature sensor;

700: the second temperature sensor;

800: outlet pipe;

810: first paragraph;

820: second paragraph;

900: Second control valve.

Detailed ways

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and the present invention is not limited to the following specific embodiments.

A gas water heater is a common household appliance that uses the heat generated by combustion to heat cold water, thereby providing people with water at a suitable temperature.

In the related art, the gas water heater includes a combustion chamber and a heat exchange tube wound outside the combustion chamber. One end of the heat exchange tube is connected to the water inlet of the water heater, and the other end is connected to the water outlet of the water heater. Cold water enters the heat exchange tube from the water inlet, and The heat generated by the combustion chamber is absorbed to form hot water, and the hot water flows out from the outlet pipe of the water heater to the water equipment such as showers or faucets.

However, when the gas water heater is turned on, due to insufficient heat generated by the combustion chamber, the water temperature is low, and the uneven heating of the water flow in the heat exchange tube is prone to fluctuations in water temperature, which affects the user experience.

In order to solve the above problem, this embodiment provides a water heater. When the water heater is turned on or when the water temperature fluctuates, hot water with high temperature is injected into the water outlet in time, thereby increasing the water temperature and improving the user's experience.

FIG. 1 is a schematic structural diagram of a water heater in an embodiment of the present invention; FIG. 2 is a first structural schematic diagram of the water storage tank in FIG. 1 .

Please refer to FIG. 1 and FIG. 2. This embodiment provides a water heater. The water heater can be of various types, such as solar water heaters, electric water heaters, etc. In particular, the water heater can be a gas water heater. illustrate.

The gas water heater can have a combustion chamber, the combustion chamber can be connected with a gas pipeline, the gas burns in the combustion chamber and emits heat, the heat exchange pipe is wound outside the combustion chamber, one end is connected with the water inlet pipe 300, and the other end is connected with the water outlet pipe 800; the water inlet pipe The head end of 300 constitutes a water inlet for inputting cold water to the water heater, and the end of the water outlet pipe 800 constitutes a water outlet for outputting hot water to external water equipment. The heat exchange tube wound outside the combustion chamber can exchange heat with the combustion chamber, thereby increasing the temperature of the water flow in the heat exchange tube and turning cold water into hot water.

Wherein, the head end and the end respectively refer to the upstream or downstream end along the water flow direction.

In this embodiment, the water heater includes: a water mixing valve 100 , a water storage tank 200 and a heating element 500 .

The water mixing valve 100 has a first inlet 110, a second inlet 120 and an outlet 130 that communicate with each other; the water mixing valve 100 can be connected to the water outlet pipe 800, for example, the water mixing valve 100 can be connected to the head end of the water outlet pipe 800, the first inlet 110 is connected with the heat exchange pipe, the outlet 130 is connected with the head end of the water outlet pipe 800, and the end of the water outlet pipe 800 can constitute the water outlet of the water heater, the hot water flows into the water mixing valve 100 through the first inlet 110, and flows into the water outlet pipe 800 from the outlet 130 , and from the water outlet of the water heater to the water equipment.

For another example, the water mixing valve 100 can be connected to the end of the water outlet pipe 800, the first inlet 110 is connected to the end of the water outlet pipe 800, the outlet 130 can also constitute the water outlet of the water heater, and the hot water flows into the first inlet 110 through the water outlet pipe 800, Enter the water mixing valve 100, and flow out of the water outlet of the water heater from the outlet 130.

The water storage tank 200 can be connected between the second inlet 120 and the water inlet, and one end of the water storage tank 200 is connected with the water inlet pipe 300, so as to connect the water storage tank 200 with the water inlet of the water heater.

The other end of the water storage tank 200 is connected to the second inlet 120 through the first control valve 400 , and the water in the water storage tank 200 can be injected into the water mixing valve 100 through the first control valve 400 .

The heating element 500 is disposed on the water storage tank 200 , and the heating element 500 is used for heating the water in the water storage tank 200 .

It can be understood that the temperature of the water heated by the heating element 500 may be higher than the first preset temperature set by the water heater, and the first preset temperature is an appropriate outlet water temperature set by the user. For example, the first preset temperature may be 30 degrees to 50 degrees, and the temperature of the water in the water storage tank 200 may be about 70 degrees.

Since the water temperature in the water storage tank 200 is higher than the water temperature at the first inlet 110 , the water temperature at the water outlet can be correspondingly increased by mixing the water flows from the first inlet 110 and the second inlet 120 through the water mixing valve 100 .

In this embodiment, a first temperature sensor 600 is disposed at the first inlet 110 , and the first temperature sensor 600 can detect the temperature of the water flow at the first inlet 110 . In addition, the first temperature sensor is not necessarily arranged just at the first inlet 110 Since the temperature of the water flow after heat exchange remains roughly unchanged, the first temperature sensor 600 can also be arranged on a pipeline a short distance upstream of the first inlet, and the measured temperature can be considered to be the same as the water temperature of the first inlet 110 .

The magnitude of the temperature of the water flow detected by the first temperature sensor 600 may affect the opening or closing of the first control valve 400 . When the temperature detected by the first temperature sensor 600 is lower than the first preset temperature, the first control valve 400 is opened.

When the water heater is working, for example, when the water heater is just turned on, the temperature of the water flow in the heat exchange tube is low, and the heat generated by the combustion chamber is also low at this time, resulting in the temperature of the water outlet of the water heater being lower than the first preset temperature, and due to uneven heating, The temperature of the water flow fluctuates greatly, the water temperature detected by the first temperature sensor 600 is lower than the first preset temperature, the first control valve 400 is opened, and the high temperature water flow enters the water mixing valve 100, which is mixed with the hot water flowing out of the heat exchange tube. The internal phases of the valve 100 are mixed, thereby increasing the outlet water temperature and improving the use experience.

In addition, the water mixing valve 100 is connected with the water outlet pipe 800, which is closer to the water outlet, so that the adjustment can be realized quickly and the effect of adjusting the water temperature is good.

Further, the opening degree of the first control valve 400 can be adjusted according to the temperature measured by the first temperature sensor 600 , and this process can be implemented through a circuit structure. For example, when the difference between the temperature detected by the first temperature sensor 600 and the first preset temperature is large, the opening of the first control valve 400 can be increased, and when the temperature difference is small, the opening of the first control valve 400 can be decreased degree, so that the water temperature of the water heater is always at a suitable temperature.

The water heater provided in this embodiment is provided with a water mixing valve, a water storage tank and a heating element. The water mixing valve has a first inlet, a second inlet and an outlet that communicate with each other; hot water flows into the water mixing valve through the first inlet, and flows out of the water outlet of the water heater from the outlet. One end of the water storage tank is connected to the water inlet of the water heater, and the other end of the water storage tank is connected to the second inlet through the first control valve. The heating element is arranged on the water storage tank, and the heating element is used for heating the water in the water storage tank. A first temperature sensor is arranged at the first inlet, and when the temperature detected by the first temperature sensor is lower than the first preset temperature, the first control valve is opened. Therefore, when the water heater is turned on, the water temperature of the first inlet is lower than the first preset temperature, and hot water with a higher temperature can be injected into the second inlet of the water mixing valve through the water storage tank, and the water flow of the first inlet and the second inlet The water flow at the inlet is mixed, which can increase the temperature of the water at the water outlet of the water heater, avoiding the temperature being too low and affecting the user experience. Since the water mixing valve is close to the water outlet, it can be quickly adjusted and the water temperature can be adjusted well.

On the basis of the above embodiment, the water heater includes a housing, and the water mixing valve 100 and the water storage tank 200 are arranged in the housing to avoid structural exposure, protect the internal structure of the water heater, enhance the integrity of the water heater, and improve aesthetics.

In another optional embodiment, a second temperature sensor 700 is provided at the outlet 130; when the temperature detected by the second temperature sensor 700 is greater than or equal to the first preset temperature, the first control valve 400 is closed.

The second temperature sensor 700 can detect the temperature of the water flow at the outlet 130. The second temperature sensor 700 can be arranged at the outlet 130. In addition, the second temperature sensor 700 is not necessarily arranged at the outlet 130. The two temperature sensors 700 can also be arranged on the pipeline a short distance downstream of the outlet, and the temperature measured can be considered to be the same as the temperature of the water at the outlet 130 .

When the water temperature detected by the first temperature sensor 600 is lower than the first preset temperature, the first control valve 400 is opened, and the high-temperature water flows into the water mixing valve 100 , where it is mixed with the hot water flowing out of the heat exchange tube in the water mixing valve 100 , thereby increasing the outlet water temperature, the second temperature sensor 700 can detect the temperature of the outlet 130, when the temperature of the outlet 130 reaches the first preset temperature, the operation of the water heater has been stabilized, and the outlet water temperature can always be maintained at the first preset temperature, at this time , the first control valve 400 is closed, so that the temperature of the water outlet is always at the first preset temperature, which meets the needs of the user.

It can be understood that, due to the mixing of the water mixing valve 100, the temperature at the outlet 130 gradually rises. In an ideal state, when the temperature reaches the first preset temperature, the first control valve 400 is closed. However, due to the influence of the sampling interval or measurement accuracy of the second temperature sensor 700, the temperature detected by the second temperature sensor 700 may not be exactly equal to the first preset temperature. Therefore, when the temperature detected by the second temperature sensor 700 is greater than the first preset temperature When setting the temperature, the first control valve 400 can also be closed, so as to avoid the situation that the first control valve 400 cannot be closed.

In addition, since the water heater is in a stable working state, its water temperature can basically be maintained at a constant first preset temperature. Therefore, the adjustment time for the water temperature is roughly when it is just turned on, or when the water pressure fluctuates, and the overall adjustment time is not long. The water volume is also small, the size of the water storage tank 200 is not too large, and the volume of the water mixing valve 100 is small, so this method has little effect on the volume of the water heater.

As an optional embodiment, the water heater includes a water outlet pipe 800 , the water outlet pipe 800 includes a first section 810 and a second section 820 , the first section 810 is connected to the first inlet 110 , and one end of the second section 820 is connected to the outlet 130 , the other end of the second section 820 constitutes a water outlet. The first temperature sensor 600 is connected to the first section 810 , and the second temperature sensor 700 is connected to the second section 820 .

In this embodiment, the water outlet pipe 800 includes two sections, the water mixing valve 100 is installed in the middle of the two sections, the first section 810 is connected to the first inlet 110, which is located upstream of the water mixing valve 100, and the second section 820 is connected to the outlet 130 is connected, which is located downstream of the mixing valve 100 .

The heat exchange tube may be connected to the first section 810 , and the hot water may flow out through the first section 810 , the water mixing valve 100 and the second section 820 in sequence.

The first temperature sensor 600 may be installed in the first section 810, and the second temperature sensor 700 may be installed in the second section 820, so as to facilitate the installation of the temperature sensor.

In addition, the sizes of the first segment 810 and the second segment 820 may be equal or unequal, which are specifically determined according to actual conditions. When necessary, the water outlet pipe 800 can be further divided into more sections, such as 3, 4, 5, etc., which can be set according to requirements.

In order to facilitate the control of the opening of the first control valve 400, a third temperature sensor is provided in the water storage tank 200; when the temperature detected by the third temperature sensor is lower than the second preset temperature, the heating element 500 heats the water storage tank 200. water, and the second preset temperature is greater than the first preset temperature.

The second preset temperature is the preset water temperature in the water storage tank 200, the second preset temperature may be 70 degrees, and the second preset temperature is greater than the first preset temperature, which can improve the effect of raising the water temperature.

The third temperature sensor can detect the water temperature in the water storage tank 200, and a circuit connection can be provided between the third temperature sensor and the heating element. When the water temperature is lower than the second preset temperature, the heating element 500 can heat the water in the water storage tank 200. water, so that the water temperature in the water storage tank 200 is kept stable at the second preset temperature, and the opening of the first control valve 400 can be adjusted according to the temperature detected by the first temperature sensor, the first preset temperature and the second preset temperature , and adjust the water flow rate of the second inlet 120 to rapidly increase the water temperature of the water outlet to the first preset temperature.

Referring to FIG. 2 , as an embodiment of the heating element 500 , the heating element 500 is disposed in the water storage tank 200 , and can directly contact the water flow for rapid heating.

FIG. 3 is a schematic diagram of a second structure of the water storage tank in FIG. 1 . Referring to FIG. 3 , as an embodiment of the heating element 500 , the heating element 400 covers the outside of the water storage tank, there is no need to provide a sealing structure for the heating element 500 , and the implementation is simple and convenient.

Wherein, the heating element 500 may be a variety of common heating structures such as resistance wire and graphene.

It can be understood that the control between the first temperature sensor 600, the second temperature sensor 700 and the first control valve 400 can be realized by circuit structure or by a controller. In this embodiment, the water heater further includes a controller. The controller is connected with the first temperature sensor 600 and the first control valve 400; the controller is used to control the first control valve 400 to open when the temperature detected by the first temperature sensor 600 is lower than the first preset temperature.

The controller may be a common structure capable of realizing control, such as a single-chip microcomputer or an ARM chip. It can be wired or wireless communication connection with the first temperature sensor 600 , the second temperature sensor 700 and the first control valve 400 .

Optionally, the controller is further connected with the second temperature sensor 700, and the controller is configured to control the first control valve 400 to close when the temperature detected by the second temperature sensor 700 is greater than or equal to the first preset temperature.

The controller can quickly realize the adjustment of the first control valve 400, and has a simple structure and convenient implementation. In addition, the controller can be a separate structure, which can be connected to the main board of the water heater, or the controller can be the main board of the water heater.

Optionally, a second control valve 900 is provided between the water storage tank 200 and the water inlet, the controller is connected to the second control valve 900, and the controller is used to control the water level when the water level in the water storage tank 200 is lower than the preset water level. The second control valve 900 is opened.

Wherein, the second control valve 900 may be a water inlet control valve of the water storage tank 200 , and when the water level of the water storage tank 200 decreases with the use time, the controller may control the second control valve 900 to inject water into the water storage tank 200 .

Optionally, in this process, after the first control valve 400 is closed, that is, during the water temperature adjustment process, water is not fed into the water storage tank 200, and the water temperature in the water storage tank 200 is kept constant and quickly adjusted. When the first control valve 400 is closed and the water temperature adjustment is completed, water can be injected into the water storage tank 200 .

In addition, since the amount of water required for water temperature adjustment is small, after the volume of the water storage tank 200 is properly arranged, there will not be a situation where the water in the water storage tank 200 cannot meet the adjustment requirements.

It should be noted that the terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between the two components, unless otherwise expressly qualified. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and defined, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, a first feature being "above", "over" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature "below", "below" and "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

In the above description, references to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc. refer to the specific features, structures described in connection with the embodiment or example. , material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (10)

1. A water heater, comprising: a water mixing valve, a water storage tank and a heating element;

the water mixing valve is provided with a first inlet, a second inlet and an outlet which are communicated with each other; hot water flows into the water mixing valve through the first inlet and flows out of the water outlet of the water heater from the outlet;

one end of the water storage tank is connected with a water inlet of the water heater, and the other end of the water storage tank is connected with the second inlet through a first control valve;

the heating element is arranged on the water storage tank and used for heating water in the water storage tank so as to enable the temperature of the water in the water storage tank to be higher than a first preset temperature;

and a first temperature sensor is arranged at the first inlet, and when the temperature detected by the first temperature sensor is lower than the first preset temperature, the first control valve is opened.

2. The water heater according to claim 1, wherein a second temperature sensor is provided at the outlet; and when the temperature detected by the second temperature sensor is greater than or equal to a first preset temperature, the first control valve is closed.

3. The water heater according to claim 2, wherein the water heater comprises an outlet pipe, the outlet pipe comprising a first section and a second section, the first section being connected to the first inlet, one end of the second section being connected to the outlet, the other end of the second section constituting the outlet;

the first temperature sensor is connected to the first section and the second temperature sensor is connected to the second section.

4. A water heater according to any one of claims 1-3, wherein a third temperature sensor is provided in the water storage tank; when the temperature that third temperature sensor detected is less than the second and predetermines the temperature, the heating member heating water in the water storage tank, just the second is predetermine the temperature and is greater than first predetermined temperature.

5. A water heater according to any one of claims 1-3, wherein the heating element is disposed in the water storage tank.

6. A water heater according to any one of claims 1 to 3, wherein the heating element is housed outside the water storage tank.

7. The water heater of claim 2 or 3, further comprising a controller;

the controller is connected with the first temperature sensor and the first control valve; the controller is used for controlling the first control valve to be opened when the temperature detected by the first temperature sensor is lower than a first preset temperature.

8. The water heater according to claim 7, wherein the controller is further connected to the second temperature sensor, and the controller is configured to control the first control valve to close when the temperature detected by the second temperature sensor is greater than or equal to a first preset temperature.

9. The water heater of claim 7, wherein a second control valve is disposed between the water storage tank and the water inlet, the controller is connected to the second control valve, and the controller is configured to control the second control valve to open when the water level in the water storage tank is lower than a preset water level.

10. A water heater according to any one of claims 1-3, wherein the water heater comprises a housing, and the mixing valve and the water storage tank are disposed in the housing.

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