JP2004141651A - Electric water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric water heater, having a water heater container and a water storage tank as juxtaposition and inhibiting steam in the upper part of the water heater container from flowing backward to the water storage tank. <P>SOLUTION: In this electric water heater, water 2 supplied to a water injection port 17a provided in the upper part in the water storage tank is guided to a water supply passage 17 and supplied into the water heater container 1. The amount of water supplied by a water supply means 12 can be controlled so that the liquid level in the water heater container 1 reaches a first water level set to a height higher than the upper end of the water injection port 17a, whereby the water supply means is controlled so that the liquid level reaches the first water level at need so that the water supply port 17a is blocked with the water 2 to intercept an inflow passage of steam to the water storage tank 11. Accordingly, it is possible to restrain an increase in warmth keeping electric power due to dew condensation of the steam in the water storage tank 11 to release the heat in the water heater container to the outside. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to an electric water heater used in a general household or office, and more particularly to an electric water heater provided with a water storage tank in addition to a water heater container.

Conventionally, as this type of electric water heater, a water storage tank is arranged at a lower portion of the water heater container, and when the amount of hot water in the water heater container is reduced to a predetermined amount, it is detected, and a water supply connecting the water heater container and the water storage tank is provided. The water in the water storage tank was automatically supplied to the water heater via a pipe (for example, see Patent Document 1).
JP-A-5-293046

However, in the conventional configuration, since the position of the water supply port, which is an opening provided inside the water heater container for supplying water into the water heater container, is above the full water level of the water heater container, it is above the water level of the water heater container. There is a problem that the accumulated steam flows backward from the water supply port, and heat resistance of the material of the water storage tank is required, so that the cost is increased and the power consumption at the time of keeping the heat is also increased.

The present invention solves the above-mentioned conventional problems, and with a simple configuration, suppresses the movement of steam accumulated on the water surface of a water heater to a water storage tank, suppresses a temperature rise on the water storage tank side, and reduces the temperature during use. It is an object of the present invention to provide an electric water heater that reduces electric power consumed for keeping warm.

In order to solve the above-mentioned conventional problem, the electric water heater of the present invention is provided with a water heater and a water storage tank, and when refilling the water from the water storage tank to the water heater, water is supplied to a water inlet provided at an upper part of the water storage tank. A part or the whole of the liquid is guided to a water supply path connecting the water storage tank and the water heater container, and is configured to be supplied from the water supply port into the water heater container, and the water supply port is connected to the water heater container as necessary. It can be closed by the stored liquid.

As described above, according to the present invention, with a simple configuration, the outflow of steam from the upper part of the water heater container toward the water storage tank is suppressed, and the amount of heat in the water heater container radiated to the outside via the water storage tank is reduced. It is possible to provide an electric water heater that suppresses power, and in particular, power that is consumed during heat retention.

The invention according to claim 1 is a water storage tank for storing a liquid, a water heater for storing and heating the liquid, a water supply path for sending the liquid in the water storage tank to the water heater, and an upper part in the water storage tank. A water supply means for supplying the liquid in the water storage tank to the inlet provided in the water supply means, and a water level detection means for detecting the liquid level of the water heater container, a part or all of the liquid sent to the water injection port While being guided to the water supply channel and supplied into the water heater container, the liquid level in the water heater container is at a height equal to or higher than the upper end of a water supply port which is an opening of the water heater container side end portion of the water supply channel. The water supply amount by the water supply means can be controlled so as to be a water level.

With this configuration, when the liquid level in the water heater becomes lower than the first water level and the water supply port is exposed above the liquid level, the water storage tank is passed from the water supply port to the water supply channel, and then to the water supply port of the water storage tank. A path leading to the inside of the water heater is formed, and the steam accumulated above the water heater flows into the water storage tank, which condenses in the water storage tank and the heat in the water heater escapes to the outside, increasing the heat retention power However, if necessary, the water supply means can be controlled so that the liquid level becomes the first water level, and the water supply port can be closed by the liquid to shut off the flow path of the steam into the water storage tank.

The invention according to claim 2 controls the amount of water supplied by the water supply means so that the liquid level reaches the first water level when the water level detection means detects the second water level lower than the first water level. Therefore, if the second water level is set to be equal to or higher than the upper end of the water supply port, the water supply port can always be set below the liquid level.

In addition, when the second water level is set below the upper end of the water supply port, the water supply port may be exposed on the liquid level, but it is possible to detect or predict that the water supply port is in such a state. In addition, the water supply port can be shut off by the liquid by operating the water supply means so that the water supply port is below the liquid level to supply water.

For example, if the state where the water level is detected between the first water level and the second water level continues for a predetermined time, the water supply port may be exposed, so if necessary, By performing water supply to a predetermined water level or a predetermined amount of water, it is possible to shut off the water supply port with a liquid and suppress a large amount of steam from flowing into the water storage tank.

The invention according to claim 3 includes, in particular, a hot water supply means for supplying a hot water from the inside of the container to the outside and a hot water supply detecting means for detecting a hot water supply state of the hot water supply means, and according to a detection result of the hot water supply detecting means. The amount of water supplied by the water supply means is controlled so that the liquid level reaches the first water level. When there is a possibility that the water supply port is exposed, the water supply port can be reliably shut off, and the time during which the water supply port is exposed can be reduced.

The invention according to claim 4 is particularly configured such that when the water level detection means detects that the liquid level is lower than the first water level from the state where the first water level is detected, the water supply by the water supply means is performed after a predetermined time. Start and control the amount of water supply so that the liquid level reaches the first water level, so if there is a possibility that some or all of the water supply ports may be exposed above the liquid level, It is possible to prevent the steam in the water heater from leaking into the water storage tank for a period of time (exceeding the predetermined time).

The invention according to claim 5, particularly when the water level detection means detects the second water level or less, after a predetermined time, starts water supply by the water supply means, and the second water level is equal to or higher than the upper end of the water supply port. It is possible to suppress a drop in the temperature of hot water supplied from the outlet by supplying water into the kettle from the water supply port while hot water is being supplied from the outlet to the outside. Even if it falls below the upper end of the water supply port, water supply to the kettle starts after a predetermined time and water is supplied until the first water level, so the water supply port is exposed on the liquid surface for a long time. Is prevented, and water is supplied up to the first water level higher than the second water level, so that the amount of water supplied when used later can be increased.

In the invention according to claim 6, in particular, since the first water level is the full water level which is the upper limit of liquid storage in the water heater, if the water is supplied to at least the full water level, the exposure of the water supply port on the liquid surface is reduced. Since it can be avoided, when the water level falls below the full water level and the water supply port is exposed and it is expected that such a situation will continue for a long time, the water supply port will be filled with liquid by filling up to full water. It can be shut off to prevent the steam from flowing into the water storage tank. In addition, it is preferable to keep the water level at the maximum level in order to maximize the supply capacity.

In the invention according to claim 7, since the first water level is the lowest water level that is the lower limit of liquid storage in the water heater, the water supply port is not exposed on the liquid surface (other than the time required from detection to water supply). In addition, it is possible to prevent the inflow of steam accumulated under the liquid level above the water heater container. Further, by stopping or suppressing the heating of the kettle container, it is possible to prevent the equipment from being damaged due to the empty cooking of the kettle container.

The invention according to claim 8 has a water receiving portion that receives the liquid supplied by the water supply means and guides the liquid to the water inlet, and the water receiving portion can overflow the liquid into the water storage tank. The difference between the supply amount of liquid from the water supply means and the flow rate of the water supply port is that the water overflows at the water receiving section and returns to the water storage tank, so that the effect of the change or variation in the water supply amount of the water supply means is reduced, It is possible to stabilize the supply of the liquid from the water supply port into the water heater container and prevent the steam in the water heater container from flowing into the water storage tank via the water supply passage.

According to the ninth aspect of the present invention, in particular, since the water supply port is arranged on the side surface of the water heater container, the water supply passage can be made to be less affected by the heat of the heating means attached to the bottom of the water heater container. It can be composed of inexpensive parts with low temperature.

The invention according to claim 10 is that, in particular, since the water supply port is disposed on the bottom of the water heater container, even when the amount of liquid in the water heater container is low, the liquid is stored at the bottom of the water supply channel lower than the bottom surface of the water heater container. It is possible to prevent the steam in the kettle from flowing into the water storage tank through the passage.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Example 1)
FIG. 1 is a sectional view of an electric water heater according to a first embodiment of the present invention. As shown in FIG. 1, a water heater container 1, a lid 7, a control unit 10, a water supply path 17, an outlet path 5, a pump 4, a water supply pump drive motor 13 a, and a water level sensor 9 are provided in the main body. A water storage tank 11 is provided to be detachable from the water heater 1. In the water storage tank 11, a water supply means 12 having a water supply pump 13 and a water passage 14, a water receiving portion 15 formed around an inlet 16 communicating with the outside of the water storage tank 11, a tank valve 19, and a water level stopper 28 Is provided.

(4) The injection port 16 is provided with a tank valve 19 made of soft rubber such as silicon rubber so as to always close the injection port 16 by being urged by a spring. This is to prevent water from spilling from the inlet 16 due to vibration when supplying and transporting water to the water storage tank 11. However, in a configuration such as the present embodiment in which the water storage tank 11 is disposed on the side surface of the water heater container 1, it is easy to supply water from the upper portion. Therefore, a tank lid 11a is provided on the upper part of the water storage tank 11, and when replenishing, the tank lid 11a is taken and water is supplied from the upper part. However, when water is supplied in such a manner, a part of the supplied water is directly applied to the tank valve 19. Since the tank valve 19 is made of soft rubber as described above, if water is repeatedly applied directly to the tank valve 19, the tank valve 19 may be damaged and may not be able to fulfill its role. Therefore, in this embodiment, the cover 20 is provided above the tank valve 19.

In the water heater configured as described above, the water heater 1 heats the contained water 2 to a predetermined temperature by the heating element 3 as a heating means attached to the bottom, or keeps the temperature at the predetermined temperature. The water 2 in the water heater 1 is drawn out of the body from the outlet 6 through the outlet 5 by the pump 4 as the outlet means. Reference numeral 7 denotes a lid which covers the upper opening of the water heater container 1. The lid 7 is provided with a steam port 8 for guiding the steam generated in the water heater container 1 to the outside of the body.

Reference numeral 9 denotes a water level sensor as a water level detecting means, which includes three water level detecting elements: a full water level detecting element 9a, a water supply level detecting element 9b, and a heating stop water level detecting element 9c. The light receiving elements are configured in combination to detect whether or not each water level has been reached. The full-water level detecting element 9a detects whether or not the amount of water 2 in the water heater container 1 is equal to the full water level A1 (first water level), which is the upper limit water level of the water 2 contained in the water heater container 1. The water supply level detecting element 9b detects that the amount of water 2 has reached the water level (second water level) at which the water supply to the water heater 1 is started. The heating stop water level detecting element 9c detects that the amount of water 2 has reached the lower limit water level of the water 2 contained in the water heater container 1 (in this embodiment, a water level slightly above the bottom surface of the water heater container 1). The heating stop water level detecting element 9c stops the heating operation by the heating element 3 when the water amount of the water 2 reaches the lower limit water level, for example, when the water supply into the water heater container 1 is not sufficient, in order to prevent empty heating. It is provided in.

The control unit 10 drives the feed water pump drive motor 13a when the water level of the water 2 in the kettle 1 drops to the second water level based on the detection signal of the feed water detection element 9b, and magnetically couples with the feed water pump drive motor 13a. The water supply pump 13 (water supply means 12) provided in the water storage tank 11 which is linked to the water supply is operated. When the water supply pump 13 is operated, the water 2 stored in the water storage tank 11 passes through the water pumping path 14 (water supply means 12), and is poured into the water receiving portion 15 from the water pumping path outlet 14a (water supply means 12). The water is discharged from the water storage tank 11 through an inlet 16 provided at the bottom of the portion 15.

When the water storage tank 11 is mounted on the main body, the tank valve 19 urged by the spring to close the inlet 16 is lifted, and the inlet 16 is opened. The water 2 discharged from the eleventh inlet 16 is injected into the upper end of the water supply channel 17.

Since the supply amount per unit time of the water 2 supplied to the water receiving portion 15 by the water supply means 12 is larger than the discharge amount per unit time discharged from the water inlet 16, the difference is supplied. The water 2 returns to the water storage tank 11 from the overflow section 15a. That is, a part of the water 2 in the water storage tank 11 circulates in the water storage tank 11 through the water supply means 12 as a path. As a result, the amount of water discharged from the water inlet 16 does not largely depend on the amount of water supplied by the water supply means 12.

As described above, when the water level in the water heater vessel 1 becomes equal to or lower than the second water level, a stable amount of water is injected into the water supply passage 17, so that a stable water volume from the water supply port 17a is supplied into the water heater vessel 1. 2 is automatically added.

When the water level detection element 9a detects that the water level of the water 2 has reached the water level A1, the control unit 10 recognizes this and stops driving the water supply pump drive motor 13a. Is stopped, and the refilling of the water in the kettle 1 is stopped. Since the upper end of the opening of the water supply port 17a is provided below the second water level (the water level indicated by A2 in FIG. 1) of the water heater vessel 1, the pump 4 draws out the water 2 from the outlet 6 so that the water level is raised. Does not expose the water supply port 17a above the liquid level. Accordingly, it is possible to prevent the vapor accumulated on the liquid level in the water heater 1 from flowing into the water storage tank 11 via the water supply port 17a, the water supply path 17, and the water supply port 16.

In addition, the control method of the supply amount of the water 2 into the water heater 1 is limited to the method of detecting the water level by the water level sensor 9 and driving or stopping the water supply pump 13 according to the detection result as described above. Instead, for example, the water supply pump 13 may be driven for a required time to obtain a required amount of water. Further, the water receiving portion 15 may be integrally formed as a part of the water storage tank 11, or may be a separate component.

In addition, the water is pumped by the water supply pump 13 and guided to the inlet 16, and the water pumped from the water pump 14 is allowed to overflow on the way from the water pump 14 to the inlet 16. Thus, it is possible to eliminate water supply. This overflow configuration can be easily obtained by providing a space open to the atmosphere between the water outlet 14a and the water supply receiving portion 15. By providing the overflow portion, when the water is supplied from the water storage tank 11 to the water heater container 1, the position of the float 18 is normally detected by the water level sensor 9 to detect that the water 2 has been supplied to the full water detection 9a. Although it is stopped, even if the water level sensor 9 erroneously detects the water level due to some abnormality or the water supply pump 13 does not stop due to an abnormality of the control unit 10, if the amount of water in the water heater container 1 reaches the water supply receiving unit 15 or more, Since the water 2 overflows into the water storage tank 11 from the upper end of the water supply receiving portion 15, the water is not supplied to the water heater container 1 any more.

As a method of overflowing, if a cutout portion 15a is provided in a part of the water supply receiving portion 15 so that the water overflows from this portion, the overflow direction becomes constant, and the water supply passage outlet 14a and the water supply receiving portion 15 There is no need to provide a space between them.

As described above, according to the present embodiment, the water storage tank 11, the water heater container 1 provided in the main body, the water supply channel 17, and the inlet 16 provided in the upper part of the water storage tank 11 are provided with the water storage tank 11. It has a water supply means 12 for supplying liquid, and a water level sensor 9 for detecting the liquid level of the water heater container 1. A part or all of the liquid fed to the water inlet 16 is guided to the water supply passage 17 by gravity and is supplied to the water heater container. 1 and the liquid level in the water heater vessel 1 is equal to or higher than the upper end of a water supply port 17a, which is an opening at the end of the water supply passage 17 on the side of the water heater vessel 1, and the water level A1 (first water level) Water level by the water supply means 12 can be controlled so that the water level in the water heater container 1 becomes lower than the first water level and the water supply port 17a is exposed above the liquid level. From the water supply channel 17 and the reservoir A passage leading to the inside of the water storage tank 11 is formed through the water inlet of the reservoir 11, and the steam accumulated above the water heater vessel 1 flows into the water storage tank 11, and the steam condenses in the water storage tank 11. Although there is a danger, if necessary, the water supply means can be controlled so that the liquid level is at the first water level, and the water supply port 17a can be closed by the liquid to shut off the flow path of the steam into the water storage tank 11. .

Further, according to the present embodiment, when the water level sensor 9 detects a water supply level A2 (second water level) lower than the full water level A1 (first water level), the liquid level reaches the full water level A1 (first water level). The water supply amount by the water supply means 12 is controlled so that the water supply level A2 (second water level) is set to be equal to or higher than the upper end of the water supply port 17a, so that the water supply port 17a is always set below the liquid level. be able to.

Unlike the above embodiment, when the water supply level A2 (second water level) is set below the upper end of the water supply port 17a, the water supply port 17a may be exposed on the liquid surface. Means to detect that the temperature is below A1 (first water level), or to provide a hot water supply detecting means for detecting a hot water supply state by the pump 4, such as presence or absence of driving of the pump 4, or a driving time. Alternatively, it can be estimated. Therefore, according to the detection result of the hot water supply detecting means, for example, if it is determined that the liquid level is lower than the full water level A1 (first water level) depending on whether the pump 4 is driven or not, immediately or for a predetermined time. If the driving of the water supply means 12 is started later, or if the amount of hot water supplied from the outlet 6 is estimated based on the driving time of the pump 4 and it is determined that the amount of hot water to the outside has reached a preset value, the full water level A1 By starting the driving of the pump 13 until (the first water level), the time during which the water supply port 17a is exposed on the liquid surface can be limited.

According to the present embodiment, the water supply unit 12 has the water receiving unit 15 that receives the liquid supplied by the water supply unit 12 and guides the liquid to the water injection port 16. The water receiving unit 15 can overflow the liquid into the water storage tank 11. Therefore, the difference between the supply amount of the liquid from the water supply means 12 and the liquid drawn out of the water storage tank 11 from the inlet 16 (that is, the flow rate of the liquid injected into the water supply passage 17) And returns to the inside of the water storage tank 11, so that the influence of the change or variation in the water supply amount of the water supply means 12 can be reduced, and the supply of the liquid from the water supply port 17a to the water heater vessel 1 can be stabilized. Further, it is possible to prevent the steam in the water heater 1 from flowing into the water storage tank 11 via the water supply passage 17.

(Example 2)
FIG. 2 is a sectional view of an electric water heater according to a second embodiment of the present invention. The difference from FIG. 1 of the first embodiment is that in FIG. 1, the lower limit water level A3 of the water 2 in the water heater 1 detected by the heating stop water level detecting element 9c is set at a position lower than the water supply port 17a. However, in the present embodiment, as shown in FIG. 2, the corresponding heating stop water level detecting element 29c is provided such that the corresponding lower limit water level B3 is higher than the upper end of the water supply port 17a, and the controller 30 Is different from the control unit 10 in FIG.

When the water supply level detecting element 29b detects that the water level has become equal to or lower than the water supply level B2, the control unit 30 drives the water supply means drive motor 13a after a lapse of a waiting time of 2 minutes and stores the water in the water heater 1 by the water supply means 12. The water 2 in the tank 11 is supplied.

(4) When the water level reaches the lower limit water level B3 before the elapse of the waiting time of 2 minutes, the heating operation of the heating element 3 is stopped, and water supply by the water supply means 12 into the water heater vessel 1 is started. Thereafter, when it is confirmed that the water level has recovered to a level higher than the water supply level detecting element 29b, heating by the heating element 3 is started. When the water level detecting element 29a detects that the water level has reached the water level B1, the water supply operation by the water supply means 12 is stopped.

As described above, according to the present embodiment, when the water supply level detection element 29b detects the water level B2 (second water level) or lower, the water supply by the water supply means 12 is performed so that the liquid reaches the first water level. Since it starts two minutes later, while hot water is being supplied from the outlet 6 to the outside, it is possible to suppress a decrease in the temperature of the hot water supplied from the outlet 6 by supplying water from the water supply port 17a into the kettle 1.

When the water level drops to the minimum water level B3, which is the lower limit of liquid storage in the water heater, the heating operation of the heating element 3 is stopped (the heating output is reduced to a level lower than that used for keeping the temperature low). At the same time, the water supply is immediately started and the water is supplied to the full water level B1, so that the water heater 17 is prevented from being damaged by the empty cooking and the water supply port 17a at the height of the minimum water level B3 or less is exposed above the liquid level. Can be prevented, and the inflow of steam accumulated above the water heater vessel 1 can be prevented.

When it is confirmed that the water level of the water 2 has reached a predetermined water level (in this case, the water supply water level B2) after the start of water supply until the full water level B1 is reached, the heating operation by the heating element 3 is restarted. The temperature rise time can be shortened.

(Example 3)
FIG. 3 is a sectional view of an electric water heater according to a third embodiment of the present invention. The difference between FIG. 1 of the first embodiment and FIG. 1 is that, in FIG. 1, a water supply port 17 a which is an opening at the end of the water heater 17 on the side of the water heater 1 is arranged on the side surface of the water heater 1. As shown in FIG. 3, the piping path of the corresponding water supply channel 50 is different, and the water supply port 50a which is the opening at the end of the water heater container 1 is located on the bottom surface of the water heater container 1.

When the water supply port 17a is arranged on the side surface of the water heater vessel 1 as in the first embodiment, the water supply path 17 can be provided at a position separated from the heating element 3 which is a heating means provided for heating the water heater vessel 1. Since the influence of the heat of the heating element 3 can be reduced, the water supply path can be configured with inexpensive parts having a low heat-resistant temperature.

When the water supply port 50a is disposed on the bottom surface of the water heater container 1 as in the present embodiment, when the water 2 in the water heater container 1 is small, for example, even when the water level is indicated by A3 in FIG. The water 2 is stored at the bottom of the lower water supply channel 50, so that the steam in the water heater 1 via the water supply channel 50 can be prevented from flowing into the water storage tank 11.

Sectional drawing of the electric water heater in Example 1 of this invention Sectional drawing of the electric water heater in Example 2 of this invention Sectional drawing of the electric water heater in Embodiment 3 of the present invention

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Kettle container 2 Water 3 Heating means (heating element)
4 pump (hot water supply means)
9, 29 Water level sensor (water level detection means)
9a, 29a Full water level detection element (first water level)
9b, 29b Water level detection element (second water level)
9c, 29c Heating stop water level detection element (second water level)
10, 30 control unit 11 water storage tank 12 water supply means 13 water supply pump (water supply means)
14 Pumping channel (water supply means)
15 Water receiver 16 Inlet (water supply means)
17, 50 Water supply channel 17a, 50a Water supply port

Claims (10)

A water storage tank for storing the liquid, a water heater for storing and heating the liquid, a water supply passage for sending the liquid in the water storage tank to the water heater, and a water reservoir at an inlet provided in an upper part of the water storage tank. Water supply means for supplying liquid in a tank, and water level detection means for detecting the liquid level of the water heater container, and a part or all of the liquid fed to the inlet is guided to the water supply passage and the water heater container And water supplied by the water supply means such that the liquid level in the water heater is at a first water level which is equal to or higher than the upper end of a water inlet which is an opening at the water heater side end of the water supply passage. An electric water heater configured to control the amount. 2. The electric water heater according to claim 1, wherein when the water level detecting means detects a second water level lower than the first water level, the amount of water supplied by the water supplying means is controlled so that the liquid level reaches the first water level. A hot water supply means for heating the liquid from the inside of the container to outside, and a hot water supply detection means for detecting a hot water supply state of the hot water supply means, and a liquid level reaches a first water level according to a detection result of the hot water supply detection means. 3. The electric water heater according to claim 1, wherein the amount of water supplied by the water supply means is controlled as described above. When the water level detection means detects that the liquid level has become lower than the first water level from the state where the first water level is being detected, water supply by the water supply means is started after a predetermined time, and the liquid level reaches the first water level. The electric water heater according to any one of claims 1 to 3, wherein a water supply amount is controlled so as to reach. The water level detection means detects water below the second water level, and after a predetermined time, water supply by the water supply means is started, and the second water level is set to a height equal to or higher than the upper end of the water supply port. An electric water heater according to claim 1. The electric water heater according to any one of claims 1 to 5, wherein the first water level is a full water level which is an upper limit of liquid storage in the water heater. 3. The electric water heater according to claim 2, wherein the second water level is a minimum water level that is a lower limit of liquid storage in the water heater container, and the heating of the water heater container is stopped or suppressed when the water level falls below the second water level. 8. The water receiving unit according to claim 1, further comprising a water receiving unit that receives the liquid supplied by the water supply unit and guides the liquid to a water inlet, wherein the water receiving unit is capable of overflowing the liquid into the water storage tank. 9. Electric water heater. The electric water heater according to any one of claims 1 to 8, wherein the water supply port is arranged on a side surface of the water heater container. The electric water heater according to any one of claims 1 to 8, wherein the water supply port is arranged on a bottom surface of the water heater container.

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