CN214148327U

CN214148327U - Water heater

Info

Publication number: CN214148327U
Application number: CN202022916686.2U
Authority: CN
Inventors: 李键; 赵鹏; 刘云; 闫乃锋
Original assignee: Qingdao Economic And Technology Development District Haier Water Heater Co ltd; Chongqing Haier Water Heater Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Economic And Technology Development District Haier Water Heater Co ltd; Chongqing Haier Water Heater Co Ltd; Haier Smart Home Co Ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-09-07
Anticipated expiration: 2030-12-08

Abstract

The utility model discloses a water heater, include: the water inlet pipe and the water outlet pipe extend to the outside; a burner for burning a combustible gas; a heat exchanger for supplying water to flow and heating water using heat generated from the burner; an electric heater in which an electric heating flow passage is formed; the water inlet pipe and the water outlet pipe are respectively connected with the heat exchanger to form a heating water flow path, and the electric heating flow path is connected in series in the heating water flow path; the heat exchanger is positioned above the burner, and the electric heater is transversely arranged below the burner. The compact design of the water heater is realized to reduce the whole volume of the water heater.

Description

Water heater

Technical Field

The utility model belongs to the technical field of domestic appliance, especially, relate to a water heater.

Background

At present, a gas water heater is a household appliance commonly used in daily life of people, and generally comprises a shell, a burner, a heat exchanger and other components arranged in the shell, wherein a water inlet pipe and a water outlet pipe arranged on the shell are connected with the heat exchanger, and cold water entering from a water inlet pipe can be heated by the heat exchanger and then can be output from a water outlet pipe.

However, when the gas water heater is started, part of cold water in a pipeline of the hot gas water heater cannot be heated, and a certain amount of cold water needs to flow out firstly when the gas water heater is started, so that the waiting time of a user is long. Chinese patent application No. 2008101557093 discloses a hybrid energy thermostatic control water heater, which is additionally provided with an electric heating device on a gas water heater to assist in heating a gas burner through the electric heating device. And the electric heating device adopted by the water heater in the conventional technology is arranged on one side of the main body of the gas water heater, so that the integral increase of the burner is large, and the design requirement of equipment miniaturization is not met.

Therefore, how to design a technology for reducing the overall volume of the water heater with a compact structure is the technical problem to be solved by the utility model.

SUMMERY OF THE UTILITY MODEL

The utility model provides a water heater realizes the design of water heater compact structure to reduce the whole volume of water heater.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

in one aspect, the present invention provides a water heater, comprising:

the water inlet pipe and the water outlet pipe extend to the outside;

a burner for burning a combustible gas;

a heat exchanger for supplying water to flow and heating water using heat generated from the burner;

an electric heater in which an electric heating flow passage is formed;

the water inlet pipe and the water outlet pipe are respectively connected with the heat exchanger to form a heating water flow path, and the electric heating flow path is connected in series in the heating water flow path; the heat exchanger is positioned above the burner, and the electric heater is transversely arranged below the burner.

Further, the water inlet pipe is provided with a first connecting pipe, and the water inlet pipe is connected with the heat exchanger through the first connecting pipe; the water outlet pipe is provided with a second connecting pipe and is connected with the heat exchanger through the second connecting pipe; and a bypass pipe is arranged between the first connecting pipe and the second connecting pipe.

Further, the first connection pipe and the second connection pipe are disposed at the same side of the heat exchanger, and the bypass pipe is also disposed at a side of the heat exchanger.

Further, the first connection pipe is disposed at one side of the heat exchanger, the second connection pipe is disposed at the other side of the heat exchanger, and the bypass pipe is located below the burner.

Further, the method also comprises the following steps: the electronic control box is internally provided with an electronic control board; the electric control box is arranged on the side part of the burner, and the electric control board is used for controlling the burner and the electric heater to operate.

Furthermore, a protection plate is arranged between the electric control box and the burner.

Further, the electric heater includes a heating container and a first electric heating part, the first electric heating part is provided in the heating container, and the heating container is connected in series in the heating water flow path.

Furthermore, be provided with first connector and second connector on heating container's the lateral wall, first connector with the second connector interval sets up, the binding post of first electric heating part stretches out to the outside of a tip of heating container, heating container's tip still is provided with the safety cover, the safety cover covers binding post.

Further, the electric heater includes:

a second electric heating member for generating heat by energization;

the outer sleeve is provided with a water inlet;

the water outlet is arranged at one end of the inner inserting pipe, and the auxiliary inlet is arranged at the other end of the inner inserting pipe;

a helical plate disposed around the inner cannula and extending along a length of the inner cannula;

wherein the outer sleeve is transversely arranged at the bottom of the outer shell, the inner insert tube is hermetically inserted into the outer sleeve, the auxiliary inlet is positioned in the outer sleeve, and the electric heating part is arranged on the outer sleeve and is used for heating water in the outer sleeve.

Further, the electric heater further includes: a water treatment member for performing bacteriostatic and scale-inhibiting treatment on water flowing therethrough, the water treatment member being disposed between the inner cannula and the outer cannula.

Compared with the prior art, the utility model discloses an advantage is with positive effect:

the electric heater is arranged in the shell in a built-in mode and transversely arranged, so that the electric heater can be placed in a space below the burner in the shell by fully utilizing the space in the shell, the electric heater can be integrated in the shell, components in the shell are mounted more compactly, the design requirement of miniaturization and compactness of the water heater is met, the structure compactness design of the water heater is achieved, and the whole volume of the water heater is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an embodiment of a water heater according to the present invention;

fig. 2 is a schematic view of a partial structure of an embodiment of the water heater of the present invention;

FIG. 3 is an enlarged view of a portion of area A of FIG. 2;

FIG. 4 is a schematic view of the electric heater of FIG. 2;

FIG. 5 is an exploded view of the electric heater of FIG. 4;

FIG. 6 is a schematic view of the electric heater of FIG. 2;

fig. 7 is a sectional view of the electric heater of fig. 6.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1-3, the water heater of the present embodiment includes:

a housing 100, wherein an installation space is formed inside the housing 100, and a water inlet pipe and a water outlet pipe extending to the outside are further arranged on the housing 100;

a burner 200, the burner 200 for burning a combustible gas;

a heat exchanger 300 for supplying water to flow and heating water using heat generated from the burner 200, the heat exchanger 300;

an electric heater 400 in which an electric heating flow passage is formed;

the water inlet pipe and the water outlet pipe are respectively connected with a heat exchanger 300 to form a heating water flow path, and the electric heating flow path is connected in series in the heating water flow path; the heat exchanger 300 is located above the burner 200, and the electric heater 400 is laterally disposed below the burner 200.

Specifically, the water heater of the present embodiment has a gas water heater as a main body and is additionally provided with an electric heater 400, wherein the electric heater 400 is disposed inside the outer case 100 to form an integrated structure. In order to meet the design requirement of miniaturization and compactness, the installation position of the electric heater 400 may be arranged at a spatial position below the burner 200.

For a water heater using gas as energy, besides the burner 200 and the heat exchanger 300, components such as the fan 103 and the water pump 104 are disposed in the housing 100, and the heat exchanger 300 is disposed above the burner 200 and the components such as the fan 103 and the water pump 104 are disposed below the burner 200 in a conventional layout. And a certain space margin is provided for the area where the blower fan 103 and the water pump 104 are disposed at the bottom of the casing 100, the electric heater 400 is disposed at the bottom of the burner 200 and below the blower fan 103 and at a side of the water pump 104. The electric heater 400 is installed by sufficiently using the space at the bottom of the housing 100, and the electric heater 400 is laterally arranged, so that the electric heater 400 can have a sufficiently long electric heating flow rate to heat the water flowing therethrough.

In some embodiments, there may be at least two ways for the water flow connection location of the electric heater 400. In the first mode, the electric heater 400 is connected between the water inlet pipe and the heat exchanger 300; in the second mode, the electric heater 400 is connected between the heat exchanger 300 and the outlet pipe. In the present embodiment, the electric heater 400 is connected between the water outlet pipe and the heat exchanger 300. Cold water delivered by a water supply pipe in the user's home enters the water inlet pipe, passes through the heat exchanger 300 and then enters the electric heater 400, and finally water flowing out of the electric heater is output through the water outlet pipe.

In another embodiment, to facilitate the connection of the pipelines, for example, the water inlet pipe is further provided with a first connecting pipe 1011, and the water inlet pipe is connected with the heat exchanger 300 through the first connecting pipe 1011; the water outlet pipe is provided with a second connecting pipe 1021, and the water outlet pipe is connected with the heat exchanger 300 through the second connecting pipe 1021; a bypass pipe 1000 is provided between the first connection pipe 1011 and the second connection pipe 1021.

Specifically, during actual use, the water output from the heat exchanger 300 flows into the electric heater 400 via the second connection pipe 1021 and is finally output from the water outlet pipe. When the water is switched on and off for a short time, the temperature of the water outputted from the heat exchanger 300 is high, and a part of cold water is introduced into the second connection pipe 1021 from the bypass pipe 1000, so that the cold water and the hot water are mixed, thereby reducing the occurrence of a situation that the temperature of the water is greatly increased.

In order to avoid that the bypass pipe 1000 supplies excessive cold water to the second connection pipe 1021 in the normal heating process, the pipe diameter of the bypass pipe 1000 is smaller than the pipe diameters of the first connection pipe 1011 and the second connection pipe 1021. Specifically, when the user turns off the water for a short time and starts the water supply again, and the water flow flowing in from the water inlet pipe is conveyed to the heat exchanger 300 and the bypass pipe 1000 through the first connecting pipe 1011, the heat exchange pipeline in the heat exchanger 300 is in a coil shape, so that the water resistance at the initial stage of the water flow is large, and further more cold water can enter the second connecting pipe 1021 through the bypass pipe 1000; and the water heated again in the heat exchanger 300 can be effectively cooled by the cold water after flowing into the second connection pipe 1021, so as to reduce the fluctuation of the water temperature. During normal heating, most of the water conveyed by the first connecting pipe 1011 enters the heat exchanger 300 to be heated due to the small pipe diameter of the bypass pipe 1000, so that the requirement of normal heating is met.

In addition, as for the pipe arrangement of the first connection pipe 1011, the second connection pipe 1021 and the bypass pipe 1000, the first connection pipe 1011 and the second connection pipe 1021 may be arranged at the same side of the heat exchanger 300, and the bypass pipe 1000 may also be arranged at the side of the heat exchanger 300. Alternatively, the first connection pipe 1011 is disposed at one side of the heat exchanger 300, the second connection pipe 1021 is disposed at the other side of the heat exchanger 300, and the bypass pipe 1000 is located below the combustor 200.

In some embodiments, the electric control components of the water heater are placed in the electric control box 500, and the electric components may be components such as an electric control board disposed in the electric control box 500, wherein the electric control board is used to control the operation of the burner 200 and the electric heater 400, and the specific configuration inside the electric control box 500 is not limited or described herein.

And the electronic control box 500 is also disposed inside the casing 100 for the requirement of a compact design, and the electronic control box 500 is disposed at the side of the burner 200. Specifically, there is a free space between the burner 200 and the side wall of the casing 100 for installing the electronic control box 500. In order to avoid the influence of the heat generated by the gas combustion of the burner 200 on the electrical components in the electronic control box 500, a shielding plate 501 is further arranged between the electronic control box 500 and the burner 200. The protection plate 501 is shielded between the electronic control box 500 and the burner 200, and can play a role in insulating heat for the electronic control box 500.

In one embodiment, for the concrete entities of the electric heater 400, as shown in fig. 4-5, the electric heater 400 includes a heating container 11 and a first electric heating part 12, the first electric heating part 12 is disposed in the heating container 11, and the heating container 11 is connected in series in the heating water flow path.

Specifically, the first electric heating part 12 is disposed in the heating container 11, and the water flowing into the heating container 11 is heated by the first electric heating part 12 as required and then is output from the water outlet pipe. Wherein, in order to improve the heating efficiency, the first electric heating part 12 adopts a winding pipe structure, and the water flow enters the heating container 11 and has a larger contact heat exchange area with the first electric heating part 12, so as to improve the heating efficiency.

In order to connect the heating container 11 to the heating water flow path, a first connection port 111 and a second connection port 112 are provided on a side wall of the heating container 11, and the first connection port 111 and the second connection port 112 are provided at an interval. Specifically, the first connection port 111 is connected to the second connection pipe 1021 so that the water output from the heat exchanger 300 enters the heating container 11, and the second connection port 112 is connected to the outlet pipe so that the hot water is finally output from the outlet pipe.

In addition, the connection terminal of the first electric heating member 12 extends to the outside of one end portion of the heating container 11, and a protection cover 13 is further provided at the end portion of the heating container 11, and the connection terminal is covered by the protection cover 13. Specifically, the terminal exposed outside the heating container 11 can be protected by the protective cover 13, so as to avoid potential safety hazards caused by water leakage inside the outer shell 100 of the water heater.

In another embodiment, in order to achieve the instant heating requirement of the electric heater 400, as shown in fig. 6-7, the electric heater 400 includes:

a first electric heating member 21 for generating heat by energization of the first electric heating member 21;

the outer sleeve 22, the outer sleeve 22 is provided with a water inlet 221;

an inner tube 23, one end of the inner tube 23 is provided with a water outlet 231, and the other end is provided with an auxiliary inlet 32;

a helical plate 25, the helical plate 25 being disposed around the inner cannula 23 and extending along the length of the inner cannula 23.

Wherein the inner cannula 23 is sealingly inserted into the outer cannula 22, the auxiliary inlet 32 is located inside the outer cannula 22, and the first electric heating element 21 is arranged on the outer cannula 22 and is used for heating the water in the outer cannula 22.

Specifically, in the actual use process, the water inlet 221 is connected to the second connecting pipe 1021, and the water outlet 231 is connected to the water outlet pipe. A spiral plate 25 is located in the outer sleeve 22 and distributed around the inner insert 23, the spiral plate 25 being capable of directing the water flow in the outer sleeve 22 so that the water flow spirals between the outer sleeve 22 and the inner insert 23. Therefore, the flowing path of the water flow can be effectively prolonged, so that the water flow can be uniformly heated, and the requirement of instant heating type heating water is further met.

Wherein the helical plate 25 is arranged on the inner cannula 23. Specifically, the spiral plate 25 is integrally formed in a spiral structure and is sleeved outside the inner insertion tube 23, so that the spiral plate 25 is fixed. The helical plate 25 may be welded to the inner cannula 23 or the helical plate 25 may be bonded to the inner cannula 23. The specific fixing connection between the spiral plate 25 and the inner cannula 23 is not limited and will not be described in detail herein.

In addition, for ease of installation and positioning, the outer edge of the spiral plate 25 is attached to the inner pipe wall of the outer sleeve 22. In particular, after the inner cannula 23 is inserted into the outer cannula 22, the inner cannula 23 suspended in the outer cannula 22 can be better supported and positioned due to the edge of the spiral plate 25 abutting against the inner wall of the outer cannula 22. And, because the edge of the spiral plate 25 is abutted against the inner wall of the outer sleeve 22, the water flowing from the water inlet 221 is guided and conveyed by the spiral plate 25, so as to ensure the heating uniformity of the water flow.

In some embodiments, the water inlet 221 and the water outlet 231 may be disposed at the same end of the outer sleeve 22 and the inner tube 23, such that the inflowing water flows along the length of the outer sleeve 22 and then flows along the length of the inner tube 23 in the opposite direction. In this way, it is more beneficial for the water to be heated uniformly, so that the water outlet 231 outputs water with uniform temperature.

Specifically, when the electric heater 400 is turned on again, a certain amount of hot water is stored in both the outer sleeve 22 and the inner sleeve 23, so that after cold water enters the outer sleeve 22 again, the water flowing out of the inner sleeve 23 can absorb heat to cool, thereby avoiding or reducing the problem that the temperature of the water outlet 231 is too high due to the fact that the hot water stored in both the outer sleeve 22 and the inner sleeve 23 is heated for the second time, and being more beneficial to improving the user experience.

In another embodiment, the electric heater 400 further comprises a water treatment part 24, the water treatment part 24 is used for performing bacteriostatic and scale-inhibiting treatment on water flowing through, and the water treatment part 24 is arranged between the inner cannula 23 and the outer cannula 22;

when a user opens the water using terminal to use hot water, water in the water supply pipe enters the outer sleeve 22 through the water inlet 221, and the water entering the outer sleeve 22 is treated by the water treatment part 24 to perform bacteriostasis and scale inhibition treatment on the water, so that the effect of softening the water is achieved. The softened water continues to flow and is heated by the heat generated by the first electric heating member 21, and the heated water flows into the inner socket 23 via the auxiliary inlet 32 and is output from the inner socket 23.

On one hand, an installation space is formed between the outer sleeve 22 and the inner inserting tube 23 to place a water treatment part 24, so that water flow enters the outer sleeve 22 and then passes through the water treatment part 24 to be subjected to water quality treatment; on the other hand, a circuitous pipeline is formed between the outer sleeve 22 and the inner insertion tube 23, so as to prevent the water entering the outer sleeve 22 from flowing out quickly along with the water flow, so as to ensure that the water entering the outer sleeve 22 can be in sufficient contact with the water treatment part 24, and further meet the requirement of water treatment.

In some embodiments, to ensure that the inflowing water can be treated by the water treatment component 24, the water treatment component 24 may be disposed on one side of the water inlet 221 and cover the water inlet 221. Thus, the water flowing in from the water inlet 221 is treated by the water treatment component 24, flows into the inner insert tube 23 from the auxiliary inlet 32 and is output from the water outlet 231, so as to ensure that the flowing water is treated by the water treatment component 24.

In one embodiment, the water treatment component 24 is embodied in a variety of forms, such as: in the conventional antibacterial scale inhibitor provided at the water inlet end, the water treatment member 24 preferably includes a plurality of granular materials 41, and the granular materials 41 are located at one side of the end of the spiral plate 25.

Specifically, a granular material made of a material having an antibacterial and scale-inhibiting function (e.g., silicon-phosphorus crystal) is filled between the outer sleeve 22 and the inner sleeve 23. After water flows in through the water inlet 221, the water can be in full contact with the granular materials 41, and then the contact area between the granular materials 41 and the water flow is increased, so that the water flow is better subjected to bacteriostatic and scale-inhibiting treatment.

Wherein, in order to avoid the granular materials 41 from leaking out along with the water flow, the water treatment part 24 further comprises a shielding net 42, and the shielding net 42 is positioned between the spiral plate 25 and the granular materials 41. Specifically, in use, water entering the outer casing 22 will pass through the particulate material 41 and pass through the screen 42 to flow along the spiral plate 25. Under the action of the shielding net 42, the granular material 41 is limited at one end of the outer sleeve 22, and the granular material 41 is prevented from flowing along with the water flow. The size of the mesh formed by the shielding net 42 is smaller than the size of the granular material 41.

In other embodiments, there are a plurality of ways for the first electric heating part 21 to be embodied. For example: conventional electrical heating methods are classified into an electrical heating tube and a thick film heating, which are exemplified below.

In one embodiment, the first electric heating element 21 is a thick film wrapped outside the outer sleeve 22, and the outer sleeve 22 is a heat conducting pipe. Specifically, the first electric heating element 21 is a thick film, which can be wrapped around the outer sleeve 22. correspondingly, the outer sleeve 22 is made of a material (e.g., copper tube or aluminum tube) with excellent thermal conductivity. When the thick film is electrically heated, heat is transferred to the interior through the outer sleeve 22 to heat the water flowing between the outer sleeve 22 and the inner insert 23.

Preferably, for heat preservation, the heat preservation shell 6 may be disposed outside the first electric heating part 21, on one hand, the heat preservation shell 6 can preserve heat generated by the thick film, and on the other hand, the heat preservation shell 6 may also protect the first electric heating part 21 from outside, so as to improve use reliability and safety.

In another embodiment, the first electric heating part 21 may be an electric heating pipe located between the outer sleeve 22 and the inner sleeve 23 to directly heat water flowing therethrough inside. Alternatively, the electric heating tube is wound on the outside of the outer sleeve 22, and the electric heating tube generates heat and transfers the heat through the outer sleeve 22.

In some embodiments, in order to facilitate the detection of the temperature, a temperature detector 27 may be disposed at the end of the outer sleeve 22 away from the water inlet 221, the temperature detector 27 being close to the auxiliary inlet 32 of the inner sleeve 23, and the temperature of the water flowing into the inner sleeve 23 is detected to control the heating power of the first electric heating element 21. After the water flow reversely flows into the inner insertion tube 23, the water flowing through the inner insertion tube 23 can still be adjusted by the water temperature in the outer sleeve during the outflow process, and further the heating power of the first electric heating element 21 is further adjusted according to the temperature of the water flow flowing into the inner insertion tube 23, so as to accurately control the outlet water temperature of the water outlet 231.

In other embodiments, to facilitate removal and replacement of the water treatment component 24, the outer sleeve 22 is provided with a removable flange 28 at one end. Specifically, during assembly, the flange 28 is mounted on a corresponding opening in the outer sleeve 22, and the inner sleeve 23 is sealed through the flange 28 and extends into the outer sleeve 22, thereby assembling the water treatment component 24 between the outer sleeve 22 and the inner sleeve 23. When the water treatment member 24 is to be replaced, the flange 28 is removed from the outer sleeve 22, and the water treatment member 24 can be replaced with a new one. Preferably, for ease of assembly, the flange 28 may be secured directly to the inner insert 23, for example: the flange 28 is sealingly welded to the inner insert 23, and after the flange 28 is secured to the outer sleeve 22, the inner insert 23 can be installed to simplify assembly.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.

Claims

1. A water heater, comprising:

the water inlet pipe and the water outlet pipe extend to the outside;

a burner for burning a combustible gas;

an electric heater in which an electric heating flow passage is formed;

2. The water heater according to claim 1, wherein the water inlet pipe is provided with a first connection pipe through which the water inlet pipe is connected with the heat exchanger; the water outlet pipe is provided with a second connecting pipe and is connected with the heat exchanger through the second connecting pipe; and a bypass pipe is arranged between the first connecting pipe and the second connecting pipe.

3. The water heater according to claim 2, characterized in that said first and second connection pipes are arranged on the same side of said heat exchanger, said by-pass pipe also being arranged on the side of said heat exchanger.

4. The water heater according to claim 2, wherein the first connection pipe is disposed at one side of the heat exchanger, the second connection pipe is disposed at the other side of the heat exchanger, and the bypass pipe is located below the burner.

5. The water heater of claim 1, further comprising:

the electronic control box is internally provided with an electronic control board; the electric control box is arranged on the side part of the burner, and the electric control board is used for controlling the burner and the electric heater to operate.

6. The water heater according to claim 5, wherein a protective plate is further disposed between the electrical control box and the burner.

7. A water heater according to any one of claims 1-6, wherein the electric heater comprises a heating vessel and a first electric heating element, the first electric heating element being disposed in the heating vessel, the heating vessel being connected in series in the heated water flow path.

8. The water heater according to claim 7, wherein a first connection port and a second connection port are provided on a side wall of the heating container, the first connection port and the second connection port are spaced apart from each other, the connection terminal of the first electric heating element extends to an outer side of an end portion of the heating container, and a protection cover is further provided on the end portion of the heating container, and covers the connection terminal.

9. The water heater according to any one of claims 1-6, wherein the electric heater comprises:

a second electric heating member for generating heat by energization;

the outer sleeve is provided with a water inlet;

10. The water heater of claim 9, wherein the electric heater further comprises:

a water treatment member for performing bacteriostatic and scale-inhibiting treatment on water flowing therethrough, the water treatment member being disposed between the inner cannula and the outer cannula.