KR20110035813A - Hot water tank and method for controlling the temperature of the same - Google Patents

Abstract

PURPOSE: A hot water tank and temperature control method thereof, capable of reducing energy for heating water, is provided to improve the energy efficiency of a hot water tank by partially heating around an outlet nozzle of the hot water tank to supply hot water of desire temperature. CONSTITUTION: A hot water tank comprises a tank body(200), a dividing wall(300), and a heater(400). The tank body comprises an inlet nozzle(210), an outlet nozzle(220), and an inner storage space(A). The dividing wall divides the tank body into an inflow water storing part(S) and an discharging part(D). The dividing wall exchanges the water of the discharging part and inflow water storing part. The heater is installed in the discharging part.

Description

Hot water tank and its temperature control method {HOT WATER TANK AND METHOD FOR CONTROLLING THE TEMPERATURE OF THE SAME}

The present invention relates to a hot water tank and a temperature control method thereof.

A hot water tank is a device that discharges water after heating it. The hot water tank is provided with a heater to heat the introduced water.

On the other hand, when the water introduced into the hot water tank by the heater is heated, the water of relatively high temperature rises to the top of the hot water tank and the water of relatively low temperature goes to the bottom of the hot water tank. That is, convection of water occurs inside the hot water tank. Accordingly, an inlet formed in the hot water tank is formed in the lower portion of the hot water tank so that water is introduced into the hot water tank, and an outlet formed in the hot water tank is discharged from the hot water tank so as to discharge the heated water from the hot water tank. .

Such a conventional hot water tank has a problem in that the entire water stored in the hot water tank must be heated to a temperature of the water discharged to the outlet, for example, a temperature of the hot water desired by the user. Accordingly, there is a problem that energy is wasted. Therefore, there is a problem that the energy efficiency of the hot water tank is low.

The present invention is made by recognizing at least one of the needs or problems occurring in the conventional hot water tank and its temperature control method as described above.

One object of the present invention is to enable the user to supply only the portion adjacent to the outlet of the hot water tank to the temperature of the hot water desired by the user.

Another object of the present invention is to save energy for heating the water stored in the hot water tank.

Another object of the present invention to improve the energy efficiency of the hot water tank.

Hot water tank associated with one embodiment for realizing at least one of the above problems may include the following features.

The present invention basically divides the storage space inside the hot water tank into the inlet storage part and the discharge part by the separating wall, and discharges the water of the discharge part or the entire water stored in the tank body after the first heating and discharges only the water of the discharge part. do.

Hot water tank according to the present invention is formed in the inlet and the outlet outlet water is introduced into the water tank body provided with a storage space for storing the introduced water; A partition wall provided in the tank body to divide the storage space into an inlet storage unit and an outlet unit and configured to exchange water between the inlet storage unit and the outlet unit; And a heater provided in the discharge portion; As shown in FIG.

In this case, the inlet may be formed in the inlet storage and the outlet may be formed in the outlet.

In addition, the separating wall may be formed with a flow portion so that the water in the inlet storage and the discharge portion can be exchanged with each other.

On the other hand, the dividing wall may be provided horizontally in the tank body.

In addition, the separation wall may be provided in the tank body vertically.

In addition, the separation wall may be provided to be spaced apart from the upper portion of the tank body by a predetermined interval to form a flow portion.

In addition, the partition wall may include a heat insulating material.

And, the inlet may be formed in the lower portion of the tank body.

The dividing wall may be inclined at the tank body.

On the other hand, the hot water tank according to the present invention is a temperature sensor provided in the discharge portion to detect the temperature of the water in the discharge portion; And a controller connected to the heater and the temperature sensor. It may further include.

The control unit drives the heater to heat the water of the discharge unit so that the temperature of the water of the discharge unit detected by the temperature sensor becomes a preset primary temperature, and the temperature of the water of the discharge unit detected by the temperature sensor by the user's discharge command is The heater may be driven to a preset secondary temperature to heat the discharge part and then discharged to the outlet.

On the other hand, the hot water tank according to the present invention includes a temperature sensor provided in the discharge portion to detect the temperature of the water of the discharge portion; A temperature sensor provided at the tank body adjacent to the inlet to sense the temperature of the water stored in the tank body; And a controller connected to the heater and the temperature sensor. It may further include.

The control unit drives the heater to heat the water stored in the tank main body so that the temperature of the water stored in the tank main body sensed by the temperature sensor provided in the tank main body adjacent to the inlet is a preset primary temperature, and the user exits the water. By driving the heater so that the temperature of the water of the outlet portion detected by the temperature sensor becomes a predetermined secondary temperature can be discharged to the outlet after heating the water of the outlet.

In the temperature control method of the hot water tank according to the present invention, the inflow of water into the storage space through an inlet formed in the inlet storage part of the tank body in which the storage space is divided into the inlet storage part and the outlet part by the partition wall in which the flow part is formed. step; A primary heating step of heating water by driving a heater provided in the discharge unit such that the temperature of the water detected by the temperature sensor provided in the discharge unit or the temperature sensor provided in the tank body adjacent to the inlet is a preset primary temperature; And a second heating and water extraction step of heating the water of the outlet to be discharged to the outlet by driving the heater so that the temperature of the water of the outlet detected by the temperature sensor provided at the outlet is a preset secondary temperature by the user's water outlet command. ; As shown in FIG.

In this case, the difference between the primary temperature and the secondary temperature may be 5 ℃ to 20 ℃.

According to the embodiment of the present invention as described above, only the portion adjacent to the outlet of the hot water tank can be heated to the temperature of the hot water desired by the user and supplied to the user.

In addition, according to an embodiment of the present invention, it is not necessary to heat the entire water stored in the hot water tank to the temperature of the hot water desired by the user can save energy for heating the water stored in the hot water tank.

In addition, according to the embodiment of the present invention, it is possible to increase the energy efficiency of the hot water tank.

1 is a view showing an embodiment of a hot water tank according to the present invention.
2 is a view showing another embodiment of a hot water tank according to the present invention.
3 is a view showing another embodiment of a hot water tank according to the present invention.
4 is a view showing another embodiment of a hot water tank according to the present invention.
5 is a view showing another embodiment of a hot water tank according to the present invention.
6 is a view showing an embodiment of a temperature control method of a hot water tank according to the present invention.
7 is a view showing the operation of one embodiment of the hot water tank according to the present invention shown in FIG.
8 to 10 are views showing the operation of another embodiment of the hot water tank according to the present invention shown in FIG.

In order to help the understanding of the features of the present invention as described above, it will be described in more detail with respect to the hot water tank and its temperature control method associated with an embodiment of the present invention.

Hereinafter, exemplary embodiments will be described based on embodiments best suited for understanding the technical characteristics of the present invention, and the technical features of the present invention are not limited by the illustrated embodiments, It is to be understood that the present invention may be implemented as illustrated embodiments. Accordingly, the present invention may be modified in various ways within the technical scope of the present invention through the embodiments described below, and such modified embodiments fall within the technical scope of the present invention. And, in order to help the understanding of the embodiments described below, in the reference numerals described in the accompanying drawings, among the components that will have the same function in each embodiment, the related components are denoted by the same or extension numbers.

Embodiments related to the present invention basically divide the storage space inside the hot water tank into the inlet storage part and the discharge part by the separating wall and discharge the water of the discharge part or the entire water stored in the tank body after the first heating only the second part of the discharge part. It is based on.

As illustrated in FIGS. 1 to 5, the hot water tank 100 according to the present invention may include a tank body 200, a separation wall 300, and a heater 400.

The tank body 200 may be formed with the inlet 210 and outlet 220 as shown in the embodiment shown in Figures 1 to 5. Through the inlet 210, water flows into the tank main body 200 from a water supply source such as a purified water tank (not shown) for storing filtered water through one or a plurality of purified water filters (not shown). Can be. Then, through the outlet 220, the water in the tank body 200 is discharged to the user by a discharge means (not shown), such as a discharge cock (not shown) or a faucet (not shown) connected thereto. Can be supplied. Inlet 210 may be formed in the lower portion of the tank body 200, as shown in the embodiment shown in FIG. Accordingly, water supplied from a relatively low temperature water supply source may be introduced into the lower portion of the tank body 200 through the inlet 210. As shown in the illustrated embodiment, the tank body 200 may have a storage space A in which water introduced through the inlet 210 may be stored. As shown in FIGS. 1 to 5, the dividing wall 300 may be provided in the tank body 200. The storage space A of the tank main body 200 may be divided into an inflow storage part S and a discharge part D as shown in the illustrated embodiment by the dividing wall 300. The inlet 210 may be formed in the inlet storage S of the storage space A divided by the dividing wall 300, and the outlet 220 may be formed in the outlet D. Accordingly, the water introduced into the storage space A of the tank body 200 through the inlet 210 may first flow into the inflow storage unit S and then flow into the discharge unit D.

The separation wall 300 may be configured to exchange water between the inflow storage part S and the discharge part D. To this end, the flow portion 310 may be formed in the separation wall 300 as in the illustrated embodiment. The flow portion 310 may be formed by making the width of the separation wall 300 shorter than the width of the tank body 200, as shown in the embodiment shown in Figures 1 and 4, and the embodiment shown in Figure 5 As described above, the tank body 200 may be formed to be spaced apart from the upper portion by a predetermined interval, and may be formed in the separation wall 300 in the form of a hole as shown in FIG. 2. However, the flow part 310 is not limited to the illustrated embodiment, and any water may be used as long as the water in the inlet storage part S and the discharge part D can be exchanged with each other. As such, the storage space A of the tank body 200 may be separated into the inflow storage part S and the discharge part D by the separation wall 300, and the flow part 310 of the separation wall 300 may be separated. Only by) the water in the inlet storage (S) and the outlet (D) can be limited exchange with each other. Accordingly, as will be described later, only the portion adjacent to the outlet 220 of the hot water tank 100 may be heated to a temperature of the hot water desired by the user and supplied to the user. Therefore, since it is not necessary to heat the entire water stored in the hot water tank 100 to the temperature of the hot water desired by the user, energy can be saved and energy efficiency of the hot water tank 100 can be improved.

The separation wall 300 may be provided horizontally in the tank main body 200 as shown in FIGS. 1 and 2. In addition, the separation wall 300 may be provided vertically in the tank body 200, as shown in the embodiment shown in Figs. And, as shown in the embodiment shown in Figure 4, the separation wall 300 may be provided to be inclined. As such, when the separation wall 300 is inclined to the tank body 200, since it becomes difficult for the hot water around the heater 400 of the discharge part D to flow into the inflow storage part S, that is, inflow Since the water in the storage unit S and the discharge unit D may not be exchanged well with each other, secondary heating may be easily performed for water extraction after the primary heating of the water in the discharge unit D as described below. However, the shape in which the separation wall 300 is provided in the tank main body 200 is not limited to the illustrated embodiment, and the storage space A of the tank main body 200 is introduced into the storage unit by the separation wall 300. S) and the discharge unit (D), and only if the flow of the inlet storage unit (S) and the discharge unit (D) by the flow portion 310 of the separation wall 300 can be exchanged with each other limitedly any form It is possible.

The separation wall 300 may be provided separately from the tank body 200 or may be formed integrally with the tank body 200. On the other hand, as shown in Figure 5 the separation wall 300 may include a heat insulating material. When the insulating material is included in the dividing wall 300 as described above, a part of the inflow storage part S and the discharging part D separated by the dividing wall 300, that is, the portions other than the flow part 310 may be insulated from each other. Can be. Accordingly, the water in the inlet storage unit S and the discharge unit D may be heat-exchanged with each other only through the flow unit 310.

The heater 400 may be provided in the discharge part D as shown in FIGS. 1 to 5. Accordingly, when the heater 400 is driven, the water of the discharge part D is first heated, and the water exchange of the inflow storage part S and the discharge part D through the flow part 310 of the separation wall 300 is performed. By the heat exchange by the water of the inlet storage (S) is also heated. The heater 400 may be provided inside the tank body 200 as shown in the illustrated embodiment. However, the heater 400 may be provided outside the tank body 200. However, the position of the heater 400 is not limited, and any position may be used as long as it can heat the water of the discharge part D.

On the other hand, the hot water tank 100 according to the present invention, as shown in the embodiment shown in Figures 1 to 5 may further include a temperature sensor 500, the control unit 600. In addition, the temperature sensor 500 'may further include.

The temperature sensor 500 may be provided in the discharge part D as shown in FIGS. 1 to 5. The temperature sensor 500 may detect the temperature of the water in the discharge part D. The temperature sensor 500 is not particularly limited, and any temperature can be used as long as it can sense the temperature of water.

In addition, the temperature sensor 500 ′ may be provided in the tank main body 200 adjacent to the inlet 210 as shown in FIG. 5. The temperature of the water stored in the tank main body 200 can be detected by the temperature sensor 500 '. The temperature sensor 500 'is also not particularly limited, and any temperature can be used as long as it can sense the temperature of the water.

As illustrated in FIGS. 1 to 4, the controller 600 may be connected to the heater 400 and the temperature sensor 500. In addition, the controller 600 may be connected to the temperature sensor 500 'as shown in FIG. 5. The controller 600 may be connected to a valve V provided at each of the inlet 210 and the outlet 220 as shown in FIGS. 8 to 10.

In the control unit 600 of the embodiment shown in Figures 1 to 4, the heater (1) so that the temperature of the water of the discharge unit (D) detected by the temperature sensor 500 provided in the discharge unit (D) becomes a predetermined primary temperature in advance. 400 may be driven to heat the water of the discharge part (D). As such, when the water of the discharge part (D) is heated, as described above, the heat exchange by the exchange of water between the inlet storage part (S) and the discharge part (D) through the flow part 310 of the separation wall 300 is performed. The heat is also transferred to the water in the inlet storage (S). Accordingly, the temperature of the water in the inlet storage S does not reach the primary temperature but reaches a temperature close to the primary temperature. In addition, the temperature of the water of the discharge unit (D) detected by the temperature sensor 500 after heating so that the water temperature of the discharge unit (D) becomes the primary temperature, the heat exchange or natural cooling with the water of the inlet storage (S) Even when the temperature falls below the primary temperature, the controller 600 drives the heater 400 so that the temperature of the water of the discharge unit D detected by the temperature sensor 500 becomes the primary temperature. Can be heated. Through this process, the inlet storage unit S can also finally maintain the primary temperature state.

Meanwhile, in the control unit 600 of the embodiment shown in FIG. 5, the temperature of the water stored in the tank body 200 detected by the temperature sensor 500 ′ provided in the tank body 200 adjacent to the inlet 210 is set in advance. The heater 400 may be driven so as to have a difference temperature, thereby heating the temperature of the water stored in the tank main body 200. That is, in this case, as described above, instead of heating only the water in the discharge unit D to be a preset primary temperature, the entire water stored in the tank main body 200 is heated to be a preset primary temperature.

As such, when the temperature of the water of the discharge unit (D) detected by the temperature sensor 500 or the temperature of the water stored in the tank main body 200 sensed by the temperature sensor 500 'becomes the primary temperature, for example, the water extraction button According to the user's discharge command such as pressing (not shown), the control unit 600 controls the heater 400 so that the temperature of the water of the discharge unit D detected by the temperature sensor 500 becomes a preset secondary temperature. After driving to heat the water in the discharge unit (D), it may be discharged to the water outlet (220).

6 to 10, an embodiment of a method of controlling a temperature of a hot water tank and an embodiment of a hot water tank according to the present invention will be described.

For convenience of explanation, assume that the primary temperature is set to 70 ° C and the secondary temperature is set to 85 ° C.

The temperature control method of the hot water tank according to the present invention comprises a water inflow step (S100), the primary heating step (S200), and the secondary heating and water extraction step (S300) as shown in the embodiment shown in FIG. Can be.

In the water inflow step (S100), the above-described tank body 200 in which the storage space A is divided into the inflow storage part S and the discharge part D by the separating wall 300 in which the flow part 310 is formed. Water is introduced into the storage space (A) of the tank body 200 through the inlet 210 of the inlet storage (S) of the. That is, as shown in FIGS. 7 and 8, when the valve V provided in the inlet 210 is opened by the control unit 600, a water supply source such as a purified water tank (not shown) connected to the inlet 210 is illustrated. Water is supplied to the storage space A of the tank body 200 through the water inlet 210.

Accordingly, as shown in FIG. 7 and FIG. 8, water is first introduced into the inflow storage unit S of the storage space A of the tank body 200, and water introduced into the inflow storage unit S is separated. Through the flow portion 310 of the wall 300 is introduced into the discharge portion (D) of the storage space (A) of the tank body 200.

In the first heating step (S200) the temperature sensor provided in the tank body 200 adjacent to the water temperature or water inlet 210 of the discharge unit (D) detected by the temperature sensor 500 provided in the discharge unit (D) ( The heater 400 provided in the discharge unit D by the control unit 600 such that the temperature of the water stored in the tank main body 200 sensed at 500 'becomes a preset primary temperature, as assumed, 70 ° C. Drive to heat the water of the discharge unit (D).

Accordingly, as shown in Figs. 7 and 9, the water in the discharge portion D is heated to a primary temperature, that is, 70 ° C as assumed in this embodiment. At this time, the water of the inlet storage unit S and the outlet unit D are exchanged with each other through the flow unit 310 of the separation wall 300 to exchange heat, thereby heating the heater 400 to the water of the inlet storage unit S. Heat is transferred and heated. In the case shown in Figure 7, the water is discharged by the heater 400 until the temperature of the water of the discharge unit (D) detected by the temperature sensor 500 provided in the discharge unit (D) reaches the primary temperature Heated. And, as shown in Figure 9, the temperature of the water detected by the temperature sensor 500 'provided in the tank body 200 adjacent to the inlet 210, that is, the temperature of the entire water stored in the tank body 200 Water is heated by the heater 400 until the primary temperature is reached. However, even in the case as shown in Figure 7, the temperature of the water stored in the tank body 200 other than the discharge unit (D) also does not reach the primary temperature of 70 ℃, it reaches a temperature close to the primary temperature.

In addition, as described above, after the temperature of the water of the discharge unit (D) or the temperature of the water stored in the tank main body 200 is 70 ° C, which is the primary temperature, the temperature sensor 500 or the temperature sensor 500 'is detected. The temperature of the water of the discharge unit (D) or the temperature of the water stored in the tank body 200 may drop below the primary temperature by heat exchange or natural cooling with the water of the inlet storage unit (S). Even in this case, the control unit so that the temperature of the water of the discharge unit (D) detected by the temperature sensor 500 or the temperature of the water stored in the tank main body 200 detected by the temperature sensor 500 'becomes a primary temperature of 70 ℃. The heater 400 is driven by the 600 to heat the water. By this primary heating step (S200), the water of the discharge portion (D) of the tank body 200 or the water stored in the tank body 200 is to maintain a primary temperature of 70 ℃. Therefore, since the entire water in the storage space A of the tank main body 200 does not need to be heated to a secondary temperature, which will be described later, for example, a temperature of hot water desired by the user, or 85 ° C. as assumed, it is necessary to heat the water. Energy can be saved. And accordingly, the energy efficiency of the hot water tank 100 can be improved.

In the secondary heating step (S300), when the user's water discharge command is input, the control unit (100) so that the temperature of the water of the discharge unit (D) detected by the temperature sensor 500 is a preset secondary temperature, as assumed, 85 ℃ The heater 400 is driven by 600 to heat the water of the discharge part D and then discharged to the water outlet 220. Accordingly, only the water in the discharge part D is heated to a secondary temperature, for example, the temperature of the hot water desired by the user, as assumed, to 85 ° C. Thereafter, the water of the discharge part D heated to the secondary temperature by opening the valve V provided at the outlet port 220 by the controller 600 is discharged through the outlet port 220 and discharged connected to the outlet port 220. It can be supplied to the user by means of discharge, such as cock or facet.

On the other hand, the difference between the primary temperature and the secondary temperature may be 5 ℃ to 20 ℃. If the difference between the primary temperature and the secondary temperature is less than 5 ℃, since the difference between the primary temperature and the secondary temperature is not large, in the primary heating step (S200) without heating in the secondary heating step (S300) By heating only, heating up to a temperature close to the secondary temperature is possible, and does not significantly differ from the conventional hot water tank. Therefore, energy required for heating the water in the hot water tank 100 is not saved. In addition, when the difference between the primary temperature and the secondary temperature exceeds 20 ℃, the difference between the primary temperature and the secondary temperature is too large, so that the secondary temperature in the secondary heating step (S300) of the hot water tank Much energy is required to heat the water in the outlet D. Therefore, even in this case, the energy required for heating the water in the hot water tank 100 is not saved. Therefore, the difference between the primary temperature and the secondary temperature for saving energy required for heating the water of the hot water tank 100 is preferably 5 ° C to 20 ° C.

Thus, when using the hot water tank and the temperature control method according to the present invention, the storage space of the tank body of the hot water tank is divided into the inlet storage and the outlet, and the inlet storage and the outlet of the water is limited to exchange only through the flow section After heating the outlet water or the water stored in the tank body to the first temperature, only the outlet water can be heated to the secondary temperature and the outlet water heated up to the secondary temperature can be discharged through the outlet formed in the outlet. . That is, only the portion adjacent to the outlet of the hot water tank can be heated to the temperature of the hot water desired by the user and supplied to the user.

Accordingly, it is not necessary to heat the entire water stored in the hot water tank to the temperature of the hot water desired by the user can save energy.

And, the energy efficiency of the hot water tank can be improved.

The hot water tank and the temperature control method described above are not limited to the configuration of the embodiment, the embodiments may be configured by selectively combining all or part of each embodiment so that various modifications can be made. It may be.

100: hot water tank 200: tank body
210: inlet 220: outlet
300: dividing wall 310: flow part
400: Heater 500, 500 ': Temperature sensor
600: control unit A: storage space
S: inlet and storage D: outlet
V: Valve

Claims (15)

A tank main body 200 in which a water inlet 210 through which water is introduced and a water outlet 220 through which water is discharged are formed, and a storage space A capable of storing the water introduced therein;
The tank body 200 is provided to divide the storage space A into the inflow storage part S and the discharge part D, and the water of the inflow storage part S and the discharge part D are exchanged with each other. A partition wall 300 configured to be; And
A heater 400 provided in the discharge part D;
Hot water tank configured to include. The hot water tank according to claim 1, wherein the water inlet 210 is formed in the inlet storage S and the water outlet 220 is formed in the outlet D. The hot water tank according to claim 1, wherein the dividing wall (300) has a flow portion (310) formed so that the water of the inflow storage portion (S) and the discharge portion (D) can be exchanged with each other. The hot water tank according to any one of claims 1 to 3, wherein the dividing wall (300) is provided horizontally in the tank body (200). The hot water tank according to any one of claims 1 to 3, wherein the separating wall (300) is provided vertically in the tank body (200). The hot water tank according to claim 5, wherein the separation wall (300) is provided to be spaced apart from the upper portion of the tank body (200) by a predetermined interval to form the flow portion (310). The hot water tank according to claim 6, wherein the dividing wall comprises a heat insulating material. The hot water tank according to claim 6 or 7, wherein the water inlet 210 is formed under the tank main body 200. The hot water tank according to claim 1, wherein the dividing wall (300) is inclined in the tank body (200). According to claim 1, Temperature sensor 500 provided in the discharge unit (D) to detect the temperature of the water of the discharge unit (D); And
A controller 600 connected to the heater 400 and the temperature sensor 500;
Hot water tank, characterized in that it further comprises. The method of claim 10, wherein the control unit 600
The water of the discharge unit (D) is heated by driving the heater (400) so that the temperature of the water of the discharge unit (D) detected by the temperature sensor 500 becomes a preset primary temperature,
The water of the discharge unit D is heated by driving the heater 400 so that the temperature of the water of the discharge unit D detected by the user's water discharge command is a preset secondary temperature. Hot water tank, characterized in that to discharge to the outlet 220 after. According to claim 1, Temperature sensor 500 provided in the discharge unit (D) to detect the temperature of the water of the discharge unit (D);
A temperature sensor 500 'provided at the tank body 200 adjacent to the water inlet 210 to sense the temperature of the water stored in the tank body 200; And
A controller 600 connected to the heater 400 and the temperature sensors 500 and 500 ';
Hot water tank, characterized in that it further comprises. The method of claim 12, wherein the control unit 600
The water is stored in the tank main body 200 by driving the heater 400 so that the temperature of the water stored in the tank main body 200 detected by the temperature sensor 500 'becomes a preset primary temperature,
The water of the discharge unit D is heated by driving the heater 400 such that the temperature of the water of the discharge unit D detected by the user's water discharge command is a preset secondary temperature. Hot water tank, characterized in that to discharge to the outlet 220 after. The storage space A is formed in the inflow storage part S of the tank body 200 divided into the inflow storage part S and the discharge part D by the separating wall 300 in which the flow part 310 is formed. Water inflow step (S100) for introducing water into the storage space (A) through the inlet 210 formed;
Primary heating to heat the water by driving the heater 400 provided in the discharge unit (D) so that the temperature of the water detected by the temperature sensor 500 or the temperature sensor 500 'is a preset primary temperature Step S200; And
The water of the discharge unit D is heated by driving the heater 400 so that the temperature of the water of the discharge unit D detected by the user's water discharge command is a preset secondary temperature. After the secondary heating and water discharge step (S300) for discharging to the outlet (220);
Temperature control method of the hot water tank configured to include. 15. The method of claim 14, wherein the difference between the primary temperature and the secondary temperature is 5 ° C to 20 ° C.

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