A cold and hot water switching valve and a gas water heater having the same

Abstract

The present invention provides a cold and hot water switching valve. A cold and hot water switching valve, which includes a valve body and an electric driver. A valve cavity is formed inside the valve body, and the valve cavity includes a hot water passage and a cold water passage. The valve body further includes a valve core, and the valve core controls the on / off of the hot water passage and the on / off of the cold water passage; the electric driver is connected to one end of the valve core to control the valve core to move to a first position or a second position; when the valve core is located at the first position, the hot water passage is connected and the cold water passage is disconnected; when the valve core is located at the second position, the hot water passage is disconnected and the cold water passage is connected. The present invention also provides a gas water heater having the above-mentioned cold and hot water switching valve. The structure of the present invention is simple and convenient to use, and can realize the switching between cold and hot water during bathing, promoting human blood circulation to meet people's pursuit of health.

Description

Technical Field

[0001] The present invention relates to the technical field of water-using devices, and more specifically, to a cold and hot water switching valve and a gas water heater having the same. Background Art

[0002] The method of bathing and soaking the body alternately with cold and hot water is called cold and hot water bath. The cold and hot water bath is particularly beneficial to the body. Hot water can dilate the blood vessels of the skin, while cold water can constrict them. The alternation of cold and hot water is like doing gymnastics for the blood vessels. If one can persist in it for a long time, the human body can better adapt to the cold and hot changes of the external temperature. It can not only prevent and treat allergic rhinitis, but also prevent colds, frostbite, etc., and can improve breathing and increase lung capacity. Cold water has an exciting effect on the brain and nerves, making the mind clear, while hot water can relieve fatigue. After taking a cold and hot water bath, the whole body feels very relaxed. With the pursuit of health by people, the cold and hot water bath has gradually been known and adopted by people. However, the existing domestic gas water heaters only provide pure bathroom hot water to meet the comfort requirements of people's hot water bathing needs, and cannot provide cold and hot water baths for people. Summary of the Invention

[0003] In order to overcome the defect that the existing gas water heaters cannot provide cold and hot water baths for people, the present invention provides a cold and hot water switching valve and a gas water heater having the same. The structure of the present invention is simple and convenient to use, and can realize the switching between cold and hot water during bathing, promoting blood circulation in the human body to meet people's pursuit of health.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is: a cold and hot water switching valve, which includes a valve body and an electric driver. A valve cavity is formed inside the valve body. The valve cavity includes a hot water passage and a cold water passage. The valve body further includes a valve core, and the valve core controls the on-off of the hot water passage and the on-off of the cold water passage; the electric driver is connected to one end of the valve core to control the valve core to move to a first position or a second position; when the valve core is located at the first position, the hot water passage is communicated and the cold water passage is disconnected; when the valve core is located at the second position, the hot water passage is disconnected and the cold water passage is communicated.

[0005] As a preferred solution, the valve cavity further includes a water storage passage, and the valve core controls the on-off of the water storage passage; when the valve core is located at the first position, the water storage passage is disconnected; when the valve core is located at the second position, the water storage passage is communicated.

[0006] Further, a hot water inlet, a water outlet, and a cold water inlet that are respectively communicated with the valve cavity are sequentially arranged on the valve body along the axial direction of the valve core. A hot water passage is formed between the hot water inlet and the water outlet, and a cold water passage is formed between the cold water inlet and the water outlet. A hot water valve is arranged on the valve core between the hot water inlet and the water outlet, and a cold water valve is arranged on the valve core between the cold water inlet and the water outlet. When the valve core is in the first position, the hot water valve is opened to connect the hot water passage, and the cold water valve is closed to disconnect the cold water passage. When the valve core is in the second position, the hot water valve is closed to disconnect the hot water passage, and the cold water valve is opened to connect the cold water passage. When the cold and hot water switching valve is used in cooperation with a gas water heater, its hot water inlet is connected to the hot water pipe of the gas water heater, its cold water inlet is connected to the cold water pipe of the gas water heater, and its water outlet is connected to the bathroom water outlet. When the cold and hot water switching valve works, the electric driver drives the valve core to move up and down in the valve cavity, and the valve core drives the cold water valve and the hot water valve thereon to act simultaneously to achieve the on-off function of each valve. When the electric driver pushes the valve core down to the first position, the cold water valve closes and the hot water valve opens. Cold water is blocked from flowing in, while hot water flows in from the hot water inlet and then flows out from the water outlet for people to take a bath. When the set hot water bathing time arrives, the electric driver drives the valve core to rise to the second position, the cold water valve opens, the hot water valve closes, hot water is blocked from flowing in, and cold water flows in through the cold water inlet and then flows out from the water outlet for people to take a bath. When the set cold water bathing time arrives, it switches to hot water bathing again, and so on in a cycle, so as to realize the alternating bathing of cold and hot water, stimulate the human skin, facilitate blood circulation, and enhance the user's healthy bathing experience.

[0007] Further, a water storage and replenishment port communicating with the valve cavity is provided on the valve body. A water storage path is formed between the water storage and replenishment port and the hot water inlet. The water storage and replenishment port, the hot water inlet, the water outlet, and the cold water inlet are sequentially arranged along the axial direction of the valve body. A water storage valve is provided between the water storage and replenishment port and the hot water inlet of the valve core, and the opening and closing states of the water storage valve are synchronized with those of the cold water valve. In this way, when this cold and hot water switching valve is used in cooperation with a gas water heater, a water storage tank can be additionally provided. The water storage and replenishment port is connected to the water storage tank. When entering cold water bathing, the water storage valve and the cold water valve are synchronously opened, and the hot water valve is closed. The hot water of the gas water heater can flow into the water storage tank through the water storage and replenishment port and be temporarily stored. In this way, it can be realized that during the process of alternating cold and hot water bathing, there is no need to stop the burner of the gas water heater in the middle. If there is no water storage valve and water storage tank, during the process of alternating cold and hot water bathing, when entering cold water bathing, it is necessary to stop the burner of the gas water heater and stop generating hot water. When entering hot water bathing, it is necessary to start the burner of the gas water heater again to generate hot water. Repeatedly starting and stopping the burner of the gas water heater in this way will affect the service life of the gas water heater and cause waste of gas at the same time.

[0008] Further, a water storage return port is provided on the valve body. The water storage return port is located between the hot water inlet and the hot water valve, and a one-way valve is provided on the water storage return port. During use, the bottom of the water storage tank is connected to the water storage return port. After hot water bathing and cold water bathing have been carried out previously, when entering hot water bathing again, the water storage valve and the cold water valve are synchronously closed, and the hot water valve is opened. The hot water in the water storage tank can flow into the hot water inlet through the water storage return port and then flow out for people to bathe. The one-way valve is installed on the water storage and replenishment port to enable the water in the water storage tank to flow into the hot water inlet through the water storage return port, while preventing the hot water from flowing back into the water storage tank through the water storage return port.

[0009] Further, limit steps are provided at positions corresponding to the hot water valve, the cold water valve, and the water storage valve inside the valve cavity, and the sealing member is matched with the hot water valve, the cold water valve, and the water storage valve at the limit steps.

[0010] The present invention also provides a gas water heater, which includes a heat exchanger, a hot water pipe, and a cold water pipe. The hot water pipe is located on the water outlet side of the heat exchanger, and the cold water pipe is located on the water inlet side of the heat exchanger. Among them, it further includes a controller and the above-mentioned cold and hot water switching valve. The hot water inlet of the hot water passage is communicated with the hot water pipe, the cold water inlet of the cold water passage is communicated with the cold water pipe, the water outlet of the cold and hot water switching valve is connected to the bathroom water outlet, and the controller is signal-connected to the electric driver. The action of the electric driver is controlled by the controller. The hot water bathing time and the cold water bathing time can both be set on the controller, and the controller controls the electric driver to make corresponding actions according to the set hot water bathing time and cold water bathing time.

[0011] The present invention also provides another gas water heater, which includes a heat exchanger, a hot water pipe, and a cold water pipe. The hot water pipe is located on the water outlet side of the heat exchanger, and the cold water pipe is located on the water inlet side of the heat exchanger. Among them, it further includes a controller, a water storage tank, and the above-mentioned cold and hot water switching valve. The hot water inlet of the hot water passage is connected to the hot water pipe, the cold water inlet of the cold water passage is connected to the cold water pipe, the water outlet of the cold and hot water switching valve is connected to the bathroom water outlet, the water storage and makeup water inlet of the water storage passage is communicated with the water storage tank, the bottom of the water storage tank is connected to the water storage return water inlet, and the controller is signal-connected to the electric driver.

[0012] Furthermore, both of the above two gas water heaters further include a mixing valve. The hot water pipe and the cold water pipe are respectively communicated with two water inlets of the mixing valve, the water outlet of the mixing valve is communicated with the cold water passage, and the mixing valve is signal-connected to the controller. Considering that everyone's adaptability to cold water and the cold water temperature in winter, a mixing valve is added between the cold water inlet of the cold and hot water switching valve and the cold water pipe of the gas water heater. Two water inlets of the mixing valve are respectively communicated with the cold water pipe and the hot water pipe of the gas water heater, and the mixed water is communicated to the cold water inlet of the cold and hot water switching valve. In this way, the appropriate water temperature can be adjusted according to everyone's adaptability, and then it flows in from the cold water inlet of the cold and hot water switching valve for cold water bathing.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The cold and hot water switching valve of the present invention can control the action of the electric driver through the controller. The electric driver drives the valve core to drive the cold water valve and the hot water valve to act simultaneously, and each valve conducts and cuts off respectively to realize the alternate outflow of cold and hot water from the bathroom water outlet for people to take a bath, achieving instant alternate bathing of cold and hot water. It can achieve the water temperature reaching the predetermined hot water temperature or cold water temperature in a very short time, which can better stimulate the human skin and is beneficial to promoting blood circulation, enhancing the user's healthy bathing experience.

[0015] The cold and hot water switching valve of the present invention is also provided with a water storage and makeup port, a water storage return port and a water storage valve, which can realize that during the process of alternating cold and hot water bathing, there is no need to stop the burner of the gas water heater in the middle, prolong the service life of the gas water heater and save gas.

[0016] A mixing valve is added between the cold water inlet of the cold and hot water switching valve of the present invention and the cold water pipe of the gas water heater. The cold water port and the hot water port of the mixing valve are respectively connected to the cold water pipe and the hot water pipe of the gas water heater, and the mixed water is connected to the cold water inlet of the cold and hot water switching valve. In this way, the appropriate water temperature can be adjusted according to each person's adaptability, and then it flows in from the cold water inlet of the cold and hot water switching valve for cold water bathing. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention.

[0018] Figure 2 is Figure 1 The partial enlarged view at A in

[0019] Figure 3 It is a schematic diagram of the overall structure of Embodiment 2 of the present invention.

[0020] Figure 4 It is a schematic diagram of the overall structure of Embodiment 3 of the present invention.

[0021] Figure 5 It is a schematic diagram of the overall structure of Embodiment 4 of the present invention.

[0022] In the figure, 1 - valve body, 2 - electric drive, 3 - valve cavity, 4 - valve core, 5 - hot water inlet, 6 - water outlet, 7 - cold water inlet, 8 - hot water valve, 9 - cold water valve, 10 - water storage and makeup port, 11 - water storage valve, 12 - water storage return port, 13 - check valve, 14 - limit step, 15 - seal, 16 - heat exchanger, 17 - hot water pipe, 18 - cold water pipe, 19 - controller, 20 - cold and hot water switching valve, 21 - water storage tank, 22 - mixing valve, 23 - bathroom water outlet, 24 - external cold water inlet. Detailed Description of the Invention

[0023] The accompanying drawings are only for illustrative purposes and should not be construed as limiting the patent; for a better illustration of this embodiment, some components in the drawings may be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and should not be construed as limiting the patent. In this embodiment, the hot water and cold water at the heat exchanger of the gas water heater respectively refer to the water that has reached the preset temperature after being heated by the heat exchanger, and the normal temperature water that is about to enter the heat exchanger for heating outside the water heater. The hot water and cold water at the hot and cold water switching valve respectively refer to the water that has reached the preset temperature after being heated by the heat exchanger and is transported to the hot and cold water switching valve, and the water with a temperature lower than the preset temperature of the water heater that is transported to the hot and cold water switching valve from the cold water pipe of the water heater or from the mixing valve.

[0024] Embodiment 1

[0025] As Figure 1 shown, a hot and cold water switching valve, which includes a valve body 1 and an electric driver 2. A valve cavity 3 is formed inside the valve body 1. The valve cavity 3 includes a hot water passage and a cold water passage. The valve body 1 further includes a valve core 4, and the valve core 4 controls the on-off of the hot water passage and the on-off of the cold water passage; the electric driver 2 is connected to one end of the valve core 4 to control the valve core 4 to move to a first position or a second position; when the valve core 4 is located at the first position, the hot water passage is connected and the cold water passage is disconnected; when the valve core 4 is located at the second position, the hot water passage is disconnected and the cold water passage is connected. It can be understood that the hot water passage and the cold water passage can share the water outlet or adopt different water outlets.

[0026] As Figure 1As shown in the figure, a hot water inlet 5, a water outlet 6, and a cold water inlet 7 that are respectively communicated with the valve cavity 3 are sequentially arranged on the valve body 1 along the axial direction of the valve core 4. A hot water path is formed between the hot water inlet 5 and the water outlet 6, and a cold water path is formed between the cold water inlet 7 and the water outlet 6. A hot water valve 8 is arranged on the valve core 4 between the hot water inlet 5 and the water outlet 6, and a cold water valve 9 is arranged on the valve core 4 between the cold water inlet 7 and the water outlet 6; when the valve core 4 is in the first position, the hot water valve 8 is opened to connect the hot water path, and the cold water valve 9 is closed to disconnect the cold water path; when the valve core 4 is in the second position, the hot water valve 8 is closed to disconnect the hot water path, and the cold water valve 9 is opened to connect the cold water path. When this cold and hot water switching valve is used in cooperation with a gas water heater, its hot water inlet 5 is connected to the hot water pipe of the gas water heater, its cold water inlet 7 is connected to the cold water pipe of the gas water heater, and its water outlet 6 is connected to the bathroom water outlet 23. When this cold and hot water switching valve works, the electric driver 2 drives the valve core 4 to move up and down in the valve cavity 3, and the valve core 4 drives the cold water valve 9 and the hot water valve 8 thereon to act simultaneously to realize the on-off function of each valve. When the electric driver 2 pushes the valve core 4 down to the first position, the cold water valve 9 is closed and the hot water valve 8 is opened. Cold water is blocked from flowing in, while hot water flows in from the hot water inlet 5 and then flows out from the water outlet 6 for people to take a bath. When the set hot water bathing time arrives, the electric driver 2 drives the valve core 4 to rise to the second position. The cold water valve 9 is opened and the hot water valve 8 is closed. Hot water is blocked from flowing in, and cold water flows in through the cold water inlet 7 and then flows out from the water outlet 6 for people to take a bath; when the set cold water bathing time arrives, it switches to hot water bathing again, and so on in a cycle, so as to realize instant alternating bathing of cold and hot water, and the water temperature can reach the predetermined hot water temperature or cold water temperature in a very short time, and the valve body structure is simplified, which is convenient for manufacturing and control.

[0027] As Figure 2 shown, limiting steps 14 are arranged at positions corresponding to the hot water valve 8 and the cold water valve 9 inside the valve cavity 3, and the sealing member 15 is matched with the limiting steps and the hot water valve 8 and the cold water valve 9.

[0028] Embodiment 2

[0029] This embodiment is similar to Embodiment 1, and the difference is that, as Figure 3 shown, the valve cavity 3 further includes a water storage path, and the valve core 4 controls the on-off of the water storage path; when the valve core 4 is in the first position, the water storage path is disconnected; when the valve core 4 is in the second position, the water storage path is connected.

[0030] As Figure 3As shown, a water storage and makeup port 10 communicating with the valve chamber 3 is further provided on the valve body 1. A water storage path is formed between the water storage and makeup port 10 and the hot water inlet 5. The water storage and makeup port 10, the hot water inlet 5, the water outlet 6, and the cold water inlet 7 are arranged in sequence along the axial direction of the valve body 1. A water storage valve 11 is provided between the water storage and makeup port 10 and the hot water inlet 5 on the valve core 4. The opening and closing states of the water storage valve 11 are synchronized with those of the cold water valve 9. In this way, when this cold and hot water switching valve is used in combination with a gas water heater, an additional water storage tank can be added. The water storage and makeup port 10 is connected to the water storage tank. When entering the use of cold water for bathing, the water storage valve 11 and the cold water valve 9 are synchronously opened, and the hot water valve 8 is closed. The hot water of the gas water heater can flow into the water storage tank through the water storage and makeup port 10 and be temporarily stored. In this way, it can be realized that during the process of alternating cold and hot water bathing, there is no need to stop the burner of the gas water heater in the middle. If there is no water storage valve 11 and water storage tank, during the process of alternating cold and hot water bathing, when entering cold water bathing, it is necessary to stop the burner of the gas water heater and stop generating hot water. When entering hot water bathing, it is necessary to start the burner of the gas water heater again to generate hot water. Repeatedly starting and stopping the burner of the gas water heater in this way will affect the service life of the gas water heater and cause waste of gas at the same time.

[0031] As Figure 3 shown, a water storage return port 12 is provided on the valve body 1. The water storage return port 12 is located between the hot water inlet 5 and the hot water valve 8. A one-way valve 13 is provided on the water storage return port 12. During use, the bottom of the water storage tank is connected to the water storage return port 12. After hot water bathing and cold water bathing have been carried out previously, when entering hot water bathing again, the water storage valve 11 and the cold water valve 9 are synchronously closed, and the hot water valve 8 is opened. The hot water in the water storage tank can flow into the hot water inlet 5 through the water storage return port 12 and then flow out for people to bathe. The one-way valve 13 is installed on the water storage and makeup port 10 to realize that the water in the water storage tank can flow into the hot water inlet 5 through the water storage return port 12, while preventing the hot water from flowing back into the water storage tank through the water storage return port 12.

[0032] In this embodiment, a limiting step 14 is provided at the position corresponding to the water storage valve 11, and the sealing member 15 is matched with the limiting step 14 and the water storage valve 11.

[0033] The structures and working principles of other parts of this embodiment are the same as those of Embodiment 1.

[0034] Embodiment 3

[0035] As Figure 4As shown in the figure, a gas water heater includes a heat exchanger 16, a hot water pipe 17, and a cold water pipe 18. The hot water pipe 17 is located on the water outlet side of the heat exchanger 16, and the cold water pipe 18 is located on the water inlet side of the heat exchanger 16. The cold water pipe 18 is connected to an external cold water inlet 24. Among them, it further includes a controller 19 and the cold and hot water switching valve 20 described in Embodiment 1. The hot water inlet 5 of the hot water passage is communicated with the hot water pipe 17, the cold water inlet 7 of the cold water passage is communicated with the cold water pipe 18, the water outlet 6 of the cold and hot water switching valve 20 is connected to a bathroom water outlet 23, and the controller 19 is signal-connected to the electric driver 2. The action of the electric driver 2 is controlled by the controller 19. The hot water bathing time and the cold water bathing time can both be set on the controller 19, and the controller 19 controls the electric driver 2 to make corresponding actions according to the set hot water bathing time and cold water bathing time.

[0036] As Figure 4 shown in the figure, it further includes a mixing valve 22. The hot water pipe 17 and the cold water pipe 18 are respectively communicated with two water inlets of the mixing valve 22, the water outlet 6 of the mixing valve 22 is communicated with the cold water passage, and the mixing valve 22 is signal-connected to the controller 19. Considering that everyone's adaptability to cold water and the cold water temperature in winter, a mixing valve 22 is added between the cold water inlet 7 of the cold and hot water switching valve 20 and the cold water pipe 18 of the gas water heater. Two water inlets of the mixing valve 22 are respectively communicated with the cold water pipe 18 and the hot water pipe 17 of the gas water heater, and the mixed water is communicated to the cold water inlet 7 of the cold and hot water switching valve 20. In this way, the appropriate water temperature can be adjusted according to everyone's adaptability, and then it flows in from the cold water inlet 7 of the cold and hot water switching valve 20 for cold water bathing.

[0037] Embodiment 4

[0038] This embodiment is similar to Embodiment 3, and the difference is that, as Figure 5 shown in the figure, it includes a heat exchanger 16, a hot water pipe 17, and a cold water pipe 18. The hot water pipe 17 is located on the water outlet side of the heat exchanger 16, and the cold water pipe 18 is located on the water inlet side of the heat exchanger 16. Among them, it further includes a controller 19, a water storage tank 21, and the cold and hot water switching valve 20 described in Embodiment 2. The hot water inlet 5 of the hot water passage is connected to the hot water pipe 17, the cold water inlet 7 of the cold water passage is connected to the cold water pipe 18, the water outlet 6 of the cold and hot water switching valve 20 is connected to a bathroom water outlet 23, the water storage and makeup water port 10 of the water storage passage is communicated with the water storage tank 21, the bottom of the water storage tank 21 is connected to the water storage return port 12, and the controller 19 is signal-connected to the electric driver 2.

[0039] The structures and working principles of other parts of this embodiment are the same as those of Embodiment 3.

[0040] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A cold and hot water switching valve, characterized in that, It includes a valve body (1) and an electric drive (2). A valve chamber (3) is formed inside the valve body (1). The valve chamber (3) includes a hot water passage and a cold water passage. The valve body (1) further includes a valve core (4), and the valve core (4) controls the on-off of the hot water passage and the on-off of the cold water passage. The electric drive (2) is connected to one end of the valve core (4) to control the valve core (4) to move to a first position or a second position. When the valve core (4) is in the first position, the hot water passage is connected and the cold water passage is disconnected. When the valve core (4) is in the second position, the hot water passage is disconnected and the cold water passage is connected. The electric drive (2) controls the valve core (4) to switch only and exclusively between the first position and the second position. The valve chamber (3) further includes a water storage passage, and the valve core (4) controls the on-off of the water storage passage. When the valve core (4) is in the first position, the water storage passage is disconnected. When the valve core (4) is in the second position, the water storage passage is connected. On the valve body (1), a hot water inlet (5), a water outlet (6), and a cold water inlet (7) that are respectively connected to the valve chamber (3) are sequentially arranged along the axial direction of the valve core (4). The hot water passage is formed between the hot water inlet (5) and the water outlet (6), and the cold water passage is formed between the cold water inlet (7) and the water outlet (6). The valve body (1) is further provided with a water storage and make-up water port (10) connected to the valve chamber (3). The water storage passage is formed between the water storage and make-up water port (10) and the hot water inlet (5). The water storage and make-up water port (10), the hot water inlet (5), the water outlet (6), and the cold water inlet (7) are sequentially arranged along the axial direction of the valve body (1). A water storage valve (11) is provided on the valve core (4) between the water storage and make-up water port (10) and the hot water inlet (5), and the water storage valve (11) is synchronized with the opening and closing state of the cold water passage. A water storage return port (12) is provided on the valve body (1), and the water storage return port (12) is located between the hot water inlet (5) and the valve core (4). A one-way valve (13) is provided on the water storage return port (12).

2. The cold and hot water switching valve according to claim 1, characterized in that, A hot water valve (8) is provided on the valve core (4) between the hot water inlet (5) and the water outlet (6), and a cold water valve (9) is provided on the valve core (4) between the cold water inlet (7) and the water outlet (6). When the valve core (4) is in the first position, the hot water valve (8) is opened to connect the hot water passage, and the cold water valve (9) is closed to disconnect the cold water passage. When the valve core (4) is in the second position, the hot water valve (8) is closed to disconnect the hot water passage, and the cold water valve (9) is opened to connect the cold water passage.

3. The cold and hot water switching valve according to claim 2, wherein Limit steps (14) are provided at positions corresponding to the hot water valve (8), the cold water valve (9), and the water storage valve (11) inside the valve cavity (3), and the seal (15) is engaged with the limit steps (14), the hot water valve (8), the cold water valve (9), and the water storage valve (11).

4. A gas water heater, comprising a heat exchanger (16), a hot water pipe (17) and a cold water pipe (18), wherein the hot water pipe (17) is located on the water outlet side of the heat exchanger (16), and the cold water pipe (18) is located on the water inlet side of the heat exchanger (16), characterized in that, It further includes a controller (19), a water storage tank (21), and the cold and hot water switching valve (20) according to any one of claims 1-3. The hot water passage is connected to the hot water pipe (17), the cold water passage is connected to the cold water pipe (18), the water storage passage is communicated with the water storage tank (21), and the controller (19) is in signal connection with the electric driver (2).

5. A gas water heater according to claim 4, characterized in that, It further includes a mixing valve (22). The hot water pipe (17) and the cold water pipe (18) are respectively communicated with two water inlets of the mixing valve (22), and the water outlet (6) of the mixing valve (22) is communicated with the cold water passage. The mixing valve (22) is in signal connection with the controller (19).

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