JP5837736B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type water heater.

As a hot water heater, there is a hot water storage type water heater that has a heat pump type heating source and stores hot water that has been boiled in a hot water storage tank. In this hot water storage water heater, hot water boiled using midnight electricity is stored in a hot water storage tank, and the hot water stored in the hot water storage tank is used during daytime and other usage hours. It is generally done. In such a hot water storage type water heater, when the usage amount in the usage time zone suddenly increases, it is necessary to perform a reheating operation even if it is not late at night in order to secure the necessary hot water amount (Patent Document 1). 2).
JP 2003-161545 A JP 2003-161521 A

  By the way, in the reheating operation in the hot water storage type hot water heater described above, when the amount of reheated hot water is set by the user, the reheating operation is started, and the heat pump is driven for a time during which the set amount of hot water can be boiled. And if this time passes, control which stops a heat pump will be performed because the required amount of hot water was boiled.

  However, in the above boiling control, even when a large amount of hot water is used during the reheating operation, the use of a large amount of hot water is not considered at all, and the set amount of hot water is simply increased. Is performed. For this reason, at the end of the reheating operation, there may be a case where the remaining amount of hot water intended by the user cannot be secured. On the remote control for the hot water storage type hot water heater, although it is in the process of being heated and the setting level for heating is displayed, these are all displayed in characters. For this reason, it is difficult for the user to intuitively recognize the setting level during heating or the boiling increase.

  An object of the present invention is to provide a hot water storage type hot water supply device that can reliably ensure the amount of remaining hot water desired by the user at the end of the reheating operation even when a large amount of hot water is used during reheating. Another object of the present invention is to provide a hot water storage type hot water heater that allows the user to intuitively recognize that the amount of boiling increase is being set and that the amount of boiling increase is being set.

  A hot water storage type water heater according to a first aspect includes a hot water storage tank, a plurality of temperature sensors, a remaining hot water amount display unit, and a control unit. The hot water storage tank stores hot water heated by a heating source. The plurality of temperature sensors are provided in the hot water storage tank, detect hot water stored in the hot water storage tank, and detect the temperature of the hot water in the hot water storage tank. The remaining hot water amount display section has a plurality of display elements provided corresponding to each temperature sensor. The control unit visually displays the amount of hot water in the hot water storage tank on a display element corresponding to the temperature sensor that detects that the temperature of the hot water in the hot water storage tank is equal to or higher than a predetermined temperature. Then, the control unit designates one of the temperature sensors located on the hot water amount side that is larger than the current hot water amount in the hot water storage tank to start the boiling increase operation, and the designated temperature sensor exceeds the predetermined temperature. Boil up until temperature is detected. The remaining hot water amount display section displays the current amount of hot water in the hot water storage tank for a predetermined period including the period during which the reheating operation is performed, and also displays the amount of hot water increase in the set reheating operation. Display is performed by a display method different from the normal remaining hot water amount display method of the display element corresponding to the temperature sensor designated in the additional operation.

In the hot water storage type water heater according to the first aspect of the present invention, the control unit controls the display element so that a display element corresponding to the current amount of hot water in the hot water storage tank is lit among a plurality of display elements for a predetermined period. Perform motion control. Further, the control unit controls the operation of the display element so that the display element corresponding to the set value of the amount of hot water to be heated in the boiling increase operation among the plurality of display elements blinks during a predetermined period.

The hot water storage type hot water heater according to the second aspect of the present invention is the hot water storage type hot water supply apparatus according to the first aspect of the present invention , wherein the control unit displays the display element blinking during the additional heating operation after the completion of the additional heating operation. Control the operation of the element.

  A hot water storage type hot water heater according to a third aspect of the present invention is the hot water storage type hot water supply apparatus according to the first or second aspect of the invention, wherein the controller is configured to display the amount of hot water in the current hot water storage tank that is displayed before the boiling is increased during the boiling increase operation. While the corresponding display element is turned on as it is, the display element flashes in accordance with the set value of the amount of hot water to be heated in the boiling increase operation.

The hot water storage type hot water supply device according to a fourth aspect of the present invention is the hot water storage type hot water supply device according to any one of the first to third aspects of the present invention , and the predetermined period further includes a period during which the setting related to the additional heating operation is performed.

The hot water storage type water heater according to the fifth aspect of the present invention is the hot water storage type hot water supply apparatus according to the fourth aspect of the present invention , further comprising an information display unit. The information display unit can display information related to the setting of reheating operation. And a control part performs operation | movement control of an information display part so that the hot water information which shows the amount of hot water which will be reheated by a reheating operation is displayed on an information display part.

A hot water storage type water heater according to a sixth aspect of the present invention is the hot water storage type hot water supply apparatus according to the fifth aspect , wherein the control unit selects a display element to be blinked based on the setting contents of the additional heating operation. And a control part switches the content of the hot water information displayed on an information display part based on the selection result of a display element.

A hot water storage type water heater according to a seventh aspect of the present invention is the hot water storage type hot water supply apparatus according to any of the first to sixth aspects , wherein the control unit is configured to start the heating operation and to store the current amount of hot water stored in the hot water storage tank, The temperature sensor corresponding to the result of adding the set amount of boiling is specified.

A hot water storage type water heater according to an eighth aspect of the present invention is the hot water storage type hot water supply apparatus according to any one of the first to seventh aspects , wherein the plurality of temperature sensors can detect the amount of hot water in the hot water storage tank. Are provided at predetermined intervals.

  In the hot water storage type hot water heater according to the first aspect of the present invention, during the boiling increase operation, the boiling increase operation is continued until a specific temperature sensor detects a predetermined temperature. Therefore, even if a large amount of hot water is used during the reheating operation, the use of a large amount of hot water does not affect the remaining hot water amount at the end of the boiling. Therefore, the amount of remaining hot water intended by the user can be secured. Furthermore, the amount of extra boiling can be set in correspondence with the display on the remaining hot water display section. Therefore, the user can intuitively recognize the set increase amount, and the convenience in use is improved. Furthermore, in the hot water storage type water heater, during the reheating operation, the display element displays the remaining hot water amount before the reheating, and the amount of hot water increased by the reheating operation with a display method different from the normal remaining hot water amount display method. Is displayed. Therefore, the user can visually and intuitively recognize that the reheating operation is in progress and the state of the remaining hot water amount after the reheating operation. Therefore, the convenience in use is further improved. In addition, by displaying as in the second aspect, the user can intuitively recognize the current amount of remaining hot water and the amount of hot water to be heated during the reheating operation.

In the hot water storage type water heater according to the first aspect , the display element corresponding to the remaining hot water amount in the hot water storage tank is turned on for a predetermined time, and the display element corresponding to the amount of hot water to be heated flashes. Therefore, the user can intuitively recognize the current amount of remaining hot water and the amount of hot water to be heated up. Therefore, during the reheating operation, the user can intuitively recognize the current remaining hot water amount and the hot water amount to be reheated.

In the hot water storage type hot water supply apparatus according to the second aspect , the display element blinking during the reheating operation is turned on when the reheating operation is completed. Therefore, the user can know that the reheating operation has been completed and that the desired amount of hot water has been increased.

In the hot water storage type water heater according to the fourth aspect of the invention, the display element corresponding to the amount of remaining hot water in the hot water storage tank is turned on while the setting relating to the additional heating operation is performed, and the display element corresponding to the amount of hot water to be increased flashes. . Therefore, the user can set the amount of hot water to be reheated while recognizing the current amount of remaining hot water during the setting related to the reheating operation.

In the hot water storage type hot water supply apparatus according to the fifth aspect , since the hot water information indicating the amount of hot water is displayed on the information display unit, the user can confirm the amount of hot water more reliably.

In the hot water storage type water heater according to the sixth aspect of the invention, the content of the hot water information displayed on the information display unit is switched based on the switching of the display element to be blinked. Therefore, the user can reliably recognize the amount of hot water to be heated from the display element and the information display unit.

In the hot water storage type hot water supply apparatus according to the seventh aspect , the temperature sensor corresponding to the sum of the remaining hot water amount in the hot water storage tank and the hot water amount to be heated up is designated.

In the hot water storage type hot water supply apparatus according to the eighth aspect , since the temperature sensors are arranged at predetermined intervals, each temperature sensor detects the temperature of the hot water, thereby detecting the amount of hot water. Therefore, the amount and temperature of hot water can be detected without providing a sensor for detecting the amount of hot water in addition to the sensor for detecting temperature.

The figure showing roughly the hot water storage type hot-water supply machine concerning this embodiment. The external view of the kitchen remote control which concerns on this embodiment. The figure for demonstrating the remaining hot water amount display method which concerns on this embodiment. The figure for demonstrating the content displayed on a remote control at the time of the heating increase setting which concerns on this embodiment. The figure which shows the message displayed on a display column with respect to the lighting state of LED of the remaining hot water display part which concerns on this embodiment. The figure for demonstrating the flow of the boiling increase operation | movement of this embodiment. The flowchart which shows a part of control method which concerns on this embodiment. The flowchart which shows the whole flow of the control method which concerns on this embodiment.

DESCRIPTION OF SYMBOLS 1 Hot water storage type hot water supply machine 3 Hot water storage tank 50 Remaining hot water amount display part 51-55 1st LED-5th LED (1st display element-5th display element)
T1 to T5 First temperature sensor to fifth temperature sensor

  A specific embodiment of a hot water storage type water heater of the present invention will be described in detail with reference to the drawings. FIG. 1 is a simplified diagram of a hot water storage type water heater 1 according to the present embodiment. The hot water storage type water heater 1 includes a hot water storage tank 3, a circulation path 12 connected to the hot water storage tank 3, and a heat exchange path 14 interposed in the circulation path 12. The hot water storage type water heater 1 heats the water flowing in the heat exchange path 14 by a heat pump heating source 2 to be described later, thereby boiling the low-temperature water flowing out from the hot water storage tank 3 into the circulation path 12 to the hot water storage tank 3. Returning operation can be performed. Hot water stored in the hot water storage tank 3 is supplied to a bathtub or the like (not shown).

  A water supply port 5 is provided on the bottom wall of the hot water storage tank 3, and a hot water outlet 6 is provided on the upper wall of the hot water storage tank 3. Tap water is supplied from the water supply port 5 to the hot water storage tank 3, and hot hot water is discharged from the hot water outlet 6. A water intake 10 is provided on the bottom wall of the hot water storage tank 3, and a hot water inlet 11 is provided on the top of the side wall (circumferential wall) of the hot water storage tank 3. The water intake 10 and the hot water inlet 11 are connected by the circulation path 12. The circulation path 12 is provided with a water circulation pump 13 and a heat exchange path 14. A water supply channel 8 is connected to the water supply port 5.

  Further, five first to fifth temperature sensors (remaining hot water amount detectors) T1, T2, T3, T4, and T5 are provided on the side wall inside the hot water storage tank 3 at a predetermined pitch from the upper part to the lower part. . That is, the first to fifth temperature sensors T <b> 1 to T <b> 5 detect hot water (that is, remaining hot water) stored in the hot water storage tank 3 and detect the temperature of the hot water in the hot water storage tank 3. At the bottom of the hot water storage tank 3, a temperature detector 19 a constituting the feed water temperature detecting means 19 is provided. Each of the first to fifth temperature sensors T1 to T5 and the temperature detector 19a is composed of, for example, a thermistor. The circulation path 12 is provided with a water thermistor 20a serving as the water temperature detection means 20 on the upstream side of the heat exchange path 14, and a hot water thermistor 21a serving as the hot water temperature detection means 21 on the downstream side of the heat exchange path 14. Is provided.

  The circulation path 12 has a water inlet pipe 15 and a hot water outlet pipe 16. The incoming water pipe 15 includes a first pipe 15a on the hot water storage tank 3 side where the water circulation pump 13 is interposed, a second pipe 15b on the heat source side where the incoming water thermistor 20a is interposed, and first and second pipes. It consists of a connecting pipe 15c that connects 15a and 15b. Further, the hot water supply pipe 16 is a connection pipe that connects the first pipe 16a on the hot water storage tank 3 side, the second pipe 16b on the heat source side where the hot water thermistor 21a is interposed, and the first and second pipes 16a and 16b. 16c. The connection pipes 15c and 16c are connected when the hot water storage type hot water heater 1 is installed.

  The heat pump heating source 2 includes a refrigerant circuit 2a. The refrigerant circuit 2 a includes a compressor 25, a water heat exchanger 26 including the heat exchange path 14, an electric expansion valve (that is, a decompression mechanism) 27, and an air heat exchanger (hereinafter referred to as an evaporator) 28 in order. Connected and configured. That is, the discharge pipe 29 of the compressor 25 is connected to the water heat exchanger 26, and the water heat exchanger 26 and the electric expansion valve 27 are connected by the refrigerant passage 30. The electric expansion valve 27 and the evaporator 28 are connected via a refrigerant passage 31, and the evaporator 28 and the compressor 25 are connected via a refrigerant passage 33 provided with an accumulator 32. Thus, when the compressor 25 is driven, the water flowing through the heat exchange path 14 is heated in the water heat exchanger 26. The evaporator 28 is provided with a fan 34 that adjusts the ability of the evaporator 28.

  According to the hot water storage type hot water heater 1 configured as described above, when the compressor 25 is driven and the water circulation pump 13 is driven (actuated), the stored water is supplied from the water intake 10 provided at the bottom of the hot water storage tank 3. (Specifically, low temperature water) flows out, and this stored water flows through the heat exchange path 14 of the circulation path 12. At this time, the stored water flowing on the heat exchange path 14 is heated (boiling) by the water heat exchanger 26 and returned to the upper part of the hot water storage tank 3 from the hot water inlet 11. By continuing such an operation, hot hot water can be stored in the hot water storage tank 3. Further, during the above operation, the hot water storage type hot water heater 1 adjusts the opening degree of the electric expansion valve 27 and performs discharge pipe control for adjusting the discharge pipe temperature of the compressor 25 to the target discharge pipe temperature. In this case, in the current power rate system, the unit price of midnight power is set to be lower than the unit price of power during the daytime, so the above operation is performed in the low-night time zone (for example, from 23:00 to 7:00) Until time).

  The above operation secures the amount of hot water necessary for daily life from the morning of the next day, but the remaining hot water amount in the hot water storage tank 3 is displayed on the remaining hot water amount display section 50 of the kitchen remote control R as shown in FIG. Is done. FIG. 3 specifically shows a method for displaying the remaining hot water amount in the remaining hot water amount display unit 50. As shown in FIG. 3, the remaining hot water amount display unit 50 according to the present embodiment includes a plurality of LEDs 51 to 55, and the first to fifth temperature sensors T <b> 1 to T <b> 5 attached to the hot water storage tank 3. The output is input to the control unit 57. And the control part 57 makes only LED51-55 corresponding to temperature sensor T1-T5 with the output that the temperature of warm water was 50 degreeC or more emitted light. In this case, the vertical arrangement of the temperature sensors T1 to T5 and the vertical arrangement of the LEDs 51 to 55 are completely opposite. For example, the lowermost LED 51 emits light by the output from the uppermost first temperature sensor T1, and the uppermost LED 55 emits light by the output from the lowermost fifth temperature sensor T5. Accordingly, in the remaining hot water amount display section 50, when only the lowermost LED 51 is lit, the amount of remaining hot water is extremely small in the hot water storage tank 3. In a state where all the LEDs 51 to 55 up to the uppermost stage are lit, the hot water storage tank 3 is in a state where there is almost full remaining hot water. Further, in a state where the lowermost LED 51 to the LED 53 located in the middle are lit, almost half of the remaining hot water exists in the hot water storage tank 3. In this way, the remaining hot water amount display unit 50 displays the remaining hot water amount in the hot water storage tank 3 stepwise and visually. Each of the LEDs 51 to 55 is shown as an example of a display element for representing the amount of remaining hot water, and an element having another configuration can be used.

  And the remaining hot water in the hot water storage tank 3 decreases gradually by using hot water in life. In such a case, the hot water storage type hot water heater 1 performs a reheating operation. Next, the procedure will be described. First, in the kitchen remote controller R shown in FIG. 2, the user of the hot water storage type water heater 1 operates the boiling increase operation button 56. At this time, the amount of remaining hot water in the hot water storage tank 3 is extremely small as shown in FIG. 4, and it is assumed that only the lowermost LED 51 is lit. When the reheating operation button 56 is operated, in order to set the reheating amount as shown in FIG. 4 in the display field 58 (information display section) provided at the lower part of the remaining hot water display section 50 (FIG. 2). Message is displayed. This display column 58 displays messages that gradually change as “boiling increase [+1]”, “boiling increase [+2]”, and “boiling increase [+3]” each time the heating operation button 56 is operated. That is, the message displayed in the display field 58 is information relating to the setting of the additional heating operation, and is hot water information indicating the amount of hot water to be increased by the additional heating operation. In addition, the display position of this message gradually moves to the right side in the display field 58 (see FIGS. 5A to 5C). Simultaneously with this message display, the LED 52 is in the “boiling [+1]” state, the LEDs 52 and 53 are in the “boiling [+2]” state, and the LEDs 52, 53, in the “boiling [+3]” state. Each of 54 blinks. That is, the LEDs 51 to 55 blinking are determined based on the amount of additional heating that is one of the setting contents of the additional heating operation, and the message displayed in the display column 58 is switched based on the determined LEDs 51 to 55. The selection of the additional heating [+1] to [+3], that is, the selection of the additional heating amount is performed by pressing one of the three selection buttons 59 provided at the lower part of the display field 58.

  Next, the flow of the boiling increase operation will be described based on FIG. First, as shown in FIG. 5A, in the state before the reheating operation, in the remaining hot water amount display section 50, the lower two LEDs 51 and 52 are lit. When “boiling increase [+2]” is selected from this state, the two LEDs 53 and 54 positioned above the lighting LEDs 51 and 52 of the remaining hot water amount display section 50 blink as shown in FIG. Start. Next, as shown in FIG. 2C, the control unit 57 is based on the heat pump unit 4 (specifically, a unit constituted by equipment excluding the hot water storage tank 3 in the hot water storage water heater 1 of FIG. 1). Start boiling operation. And if it detects that temperature sensor T4 corresponding to LED54 became 50 degreeC or more, the control part 57 will stop operation | movement of the heat pump unit 4, and will light up four LED51-54, and will end a heating increase operation | movement. Let

  FIG. 7 shows a flowchart for explaining the above-described boiling increase operation. 7 is performed by controlling the LEDs 51 to 55 and the like by the control unit 57. When the explanation in FIG. 6 is applied to FIG. 7, when the additional heating operation is started, the lower two LEDs 51 and 52 are lit in the remaining hot water display unit 50 (S1), When “+2” ”is selected (Yes in S2), the control unit 57 determines that the target remaining hot water display is“ 4 ”(S3). That is, the control unit 57 designates the fourth temperature sensor T4 as a temperature sensor corresponding to the sum of the current remaining hot water amount “2” stored in the hot water storage tank 3 and the set boiling amount “+2”. And the control part 57 performs a boiling increase operation until the 4th temperature sensor T4 in the hot water storage tank 3 detects the hot water temperature of 50 degreeC or more (No of S4, S5). At this time, the LEDs 51 and 52 corresponding to the remaining amount of hot water in the hot water storage tank 3 are turned on, and the LEDs 53 and 54 corresponding to the amount of hot water to be heated are in a blinking state. When the boiling increase operation is performed and the fourth temperature sensor T4 detects hot water of 50 ° C. or higher (Yes in S5), the blinking LEDs 53 and 54 are lit (S6). This operation is performed in exactly the same way regardless of the amount of remaining hot water and the amount of boiling increase. That is, when “boiling increase [+1]” is selected (S11), the boiling operation is performed until the third temperature sensor T3 in the hot water storage tank 3 detects a hot water temperature of 50 ° C. or more (S12, If the hot water of 50 degreeC or more is detected (No of S13) (Yes of S13), LED51-53 will light (S14). If “boiling increase [+3]” is selected (S21), the boiling operation is performed until the fifth temperature sensor T5 in the hot water storage tank 3 detects a hot water temperature of 50 ° C. or more (S22, When hot water of 50 ° C. or higher is detected (No in S23) (Yes in S23), all the LEDs 51 to 55 are lit (S24). It should be noted that the operation to set the amount of hot water that cannot be detected by the fifth temperature sensor T5 (for example, “boiling increase [+3]” from the state in which the lower three LEDs 51 to 53 are lit in the remaining hot water display unit 50) Is not possible).

  Further, FIG. 8 shows a generalized flowchart in the case where the number of lit LEDs in the remaining hot water amount display section is n and the amount of additional heating is + α. Briefly, when the remaining hot water display is not “0” and the boiling increase setting is made, the hot water storage type hot water heater 1 determines the target remaining hot water display as “n + α” and “n + α”. The boiling operation is performed until the temperature sensor TX corresponding to "" detects hot water of 50 ° C or higher. When the temperature sensor TX detects hot water having a temperature of 50 ° C. or higher, the LEDs from the lowermost LED to the LEDX corresponding to “n + α” are lit.

  In the hot water storage type water heater 1 of the above embodiment, during the boiling increase operation, the operation is continued until the specific temperature sensors T1 to T5 detect a predetermined temperature (50 ° C. in the present embodiment). Therefore, even if a large amount of hot water is used during the reheating operation, the use of this hot water does not affect the remaining hot water amount at the end of the reheating. Therefore, the amount of remaining hot water intended by the user can be secured. Moreover, since the amount of boiling increase can be set in correspondence with the display of the remaining hot water amount display unit 50, the user can intuitively recognize the set amount of boiling increase, and the convenience in use is improved. Further, during the reheating operation, while the display of the remaining hot water amount before the reheating is performed as it is, the flashing LEDs 51 to 55 display the hot water amount that is increased by the reheating operation. Therefore, the user can visually and intuitively recognize that the reheating operation is in progress and the state of the remaining hot water amount after the reheating operation. Therefore, the convenience in use is further improved.

  In the above embodiment, the plurality of LEDs 51 (all included in the heating range) are blinked. However, the LEDs 51 to 55 to be blinked may be only one LED 51 to 55 corresponding to the boiling target hot water amount. However, it is preferable to blink a plurality of pieces because the user can more intuitively recognize the amount of hot water that is increased in the heating operation. Further, in the above embodiment, the hot water storage type water heater 1 starts the boiling operation, and then finishes the boiling operation by the temperature detection of the designated temperature sensors T1 to T5 (in this embodiment, 50 ° C. or more). ing. However, the remaining hot water amount display unit 50 can notify the end of the boiling increase operation by another method while performing the above-described operation. Examples of the other method include a method of terminating the operation when a certain time has elapsed after the start of the heating operation. In this case, the advantage is that the user can visually and intuitively recognize the approximate state of the remaining hot water amount after completion of the reheating operation by the blinking LEDs 51 to 55 during the reheating operation. Occurs. In the above embodiment, a heat pump is used as a heating source, but other types of heating sources may be used. Moreover, in the said embodiment, the amount of hot water increase in a boiling increase operation is displayed by blinking of LED51-55 (repetition of operation | movement / non-operation). However, by changing the size of the display frame of the LEDs 51 to 55 or changing the emission color of the LEDs 51 to 55, the amount of increase in the amount of hot water in the heating operation can be displayed. That is, it is possible to adopt an arbitrary display method that is different (can be distinguished) from the normal remaining hot water amount display method of the LEDs 51 to 55. However, in the method of blinking the LEDs 51 to 55, the control configuration can be simplified.

Claims (8)

A hot water storage tank (3) for storing hot water heated by a heating source;
A plurality of temperature sensors (T1 to T5) provided in the hot water storage tank (3) for detecting the hot water stored in the hot water storage tank (3) and detecting the temperature of the hot water in the hot water storage tank (3). When,
A remaining hot water amount display section (50) having a plurality of display elements (51 to 55) provided corresponding to each of the temperature sensors (T1 to T5);
In the hot water storage tank (3), the display elements (51 to 55) corresponding to the temperature sensors (T1 to T5) that have detected that the temperature of the hot water in the hot water storage tank (3) is equal to or higher than a predetermined temperature. A control unit (57) for visually displaying the amount of hot water stored;
With
The control unit (57)
While specifying any one of the temperature sensors (T1 to T5) located on the hot water amount side larger than the current hot water amount stored in the hot water storage tank (3), the reheating operation is started.
Until the designated temperature sensor (T1 to T5) detects a temperature equal to or higher than a predetermined temperature ,
During a predetermined period including a period in which the reheating operation is performed,
Among the plurality of display elements (51 to 55), the display element corresponding to the current amount of hot water in the hot water storage tank (3) is turned on, and the set value of the amount of hot water to be reheated in the reheating operation So that the display element flashes according to
The operation of the display elements (51 to 55) is controlled.
Hot water storage water heater (1). The control unit (57) controls the operation of the display elements (51 to 55) so that the display elements (51 to 55) flashing during the boiling operation are turned on after the boiling operation is finished. I do,
The hot water storage type water heater (1) according to claim 1 .   The control unit (57)
During the reheating operation,
While performing the lighting of the display element corresponding to the amount of hot water in the current hot water storage tank (3), which is a display before boiling up, as it is,
Causing the display elements (51 to 55) to flash according to a set value of the amount of hot water to be heated in the boiling operation;
The hot water storage type water heater (1) according to claim 1 or 2. The predetermined period further includes a period during which the setting related to the additional heating operation is performed.
The hot water storage type water heater (1) according to any one of claims 1 to 3 . An information display section (58) capable of displaying information related to the setting of the additional heating operation;
The control unit (57) operates the information display unit (58) such that hot water information indicating the amount of hot water that will be heated by the boiling operation is displayed on the information display unit (58). Do control,
The hot water storage type water heater (1) according to claim 4 . The control unit (57)
Based on the setting contents of the heating operation, the display elements (51 to 55) to be blinked are selected,
Based on the selection results of the display elements (51 to 55), the contents of the hot water information displayed on the information display section (58) are switched.
The hot water storage type water heater (1) according to claim 5 . The controller (57), at the start of the boiling operation, adds the current hot water amount stored in the hot water storage tank (3) and the set boiling amount to the temperature sensor (T1). To T5),
The hot water storage type water heater (1) according to any one of claims 1 to 6 . The plurality of temperature sensors (T1 to T5) are provided in the hot water storage tank (3) at predetermined intervals so that the amount of hot water in the hot water storage tank (3) can be detected.
The hot water storage type water heater (1) according to any one of claims 1 to 7 .

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