JP2012078041A - Hot-water storage type hot-water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent overshoot of a hot-water supply temperature even when the amount of hot-water to be supplied is suddenly increased immediately after the start of simultaneous hot-water supply.SOLUTION: This hot-water storage type hot-water supply device includes a control means 27 (28, 29) for adjusting an opening degree of a first mixing valve 5 so that a temperature of hot-water/water detected by a first hot-water supply temperature sensor 9 reaches a predetermined first hot-water supply set temperature, and adjusting an opening degree of a second mixing valve 12 so that a temperature of hot-water/water detected by a second hot-water supply temperature sensor 16 reaches a predetermined second hot-water supply set temperature. The control means 27 starts supplying hot-water from a second hot-water supply pipe 14 by opening a switch valve 17 after temporarily changing the second hot-water supply set temperature to a temperature lower than the predetermined temperature, when starting supplying hot-water from the second hot-water supply pipe 14 during hot-water supply from the first hot-water supply pipe 7, if the second hot-water supply temperature is set at a predetermined temperature or higher.

Description

  The present invention relates to a hot water storage type hot water supply apparatus in which hot water from a hot water storage tank and water from a water source are mixed with a plurality of mixing valves to supply hot water to different places.

  Conventionally, in this type of hot water storage type hot water supply apparatus, a hot water mixing valve for mixing hot water from a hot water storage tank for storing hot water and water from a water source and supplying the mixed water to the hot water tap, the hot water mixing valve, the hot water tap, A hot water pipe for connecting the hot water, a hot water temperature sensor for detecting the temperature of hot water from the hot water mixing valve provided in the hot water pipe, hot water from the hot water storage tank, and water from the water source are mixed to form a bathtub Bath mixing valve for hot water filling, hot water filling pipe for connecting the bath mixing valve and the bathtub, and hot water temperature sensor for detecting the temperature of hot water from the bath mixing valve provided in the hot water filling pipe Adjusting the opening of the hot water mixing valve so that the temperature of the hot water detected by the hot water temperature sensor becomes a preset hot water setting temperature; and Hot water detected by tension temperature sensor Mixing control means for adjusting the opening of the bath mixing valve so that the temperature becomes a preset hot water filling set temperature, and when hot hot water filling is started during hot water supply, In some cases, the degree of opening was varied so that the hot water side was opened by a preset offset amount to alleviate the undershoot of the hot water temperature at the start of hot water filling.

JP 2003-279124 A

  However, in this conventional system, the hot water mixing valve is opened by a preset offset amount at the start of hot water filling during hot water supply. If the hot water supply amount suddenly increases after opening the hot water side by an offset amount as shown in FIG. 4, for example, the hot water supply temperature may be deteriorated. There is a problem that there is a high risk of overshooting.

  Accordingly, in order to solve the above problems, the present invention provides a first mixing valve for mixing hot water from a hot water storage tank for storing hot water and water from a water source and supplying the mixed water to a first hot water supply destination, and the first mixing valve. A first hot water supply pipe for connecting a valve to the first hot water supply destination, a first hot water supply temperature sensor provided in the first hot water supply pipe for detecting the temperature of hot water from the first mixing valve, and the hot water storage A second mixing valve for mixing hot water from the tank and water from the water source and filling the second hot water supply destination, and a second mixing valve for connecting the second mixing valve and the second hot water supply destination. A hot water supply pipe, a second hot water temperature sensor provided in the second hot water supply pipe for detecting the temperature of hot water from the second mixing valve, an on-off valve for opening and closing the second hot water supply pipe, and the first hot water supply temperature sensor The opening of the first mixing valve is set so that the temperature of the hot water detected at 1 becomes the preset first hot water supply temperature. And a control means for adjusting the opening of the second mixing valve so that the temperature of the hot water detected by the second hot water supply temperature sensor becomes a preset second hot water supply temperature. When the second hot water supply set temperature is set to be equal to or higher than the predetermined temperature, the second hot water supply setting is performed when the hot water supply from the second hot water supply pipe is started during the hot water supply from the first hot water supply pipe. The temperature was temporarily changed to a temperature lower than the set temperature, and then the on-off valve was opened to start hot water supply from the second hot water supply pipe.

  In addition, the control means is configured to return the second hot water supply set temperature to the temperature before the change when a certain time has elapsed since the opening of the on-off valve.

  Further, a joint valve, a hot water pipe for connecting the hot water mixing valve and the hot water tap, a hot water temperature sensor provided in the hot water pipe for detecting the temperature of hot water from the hot water mixing valve, and the hot water storage tank A bath mixing valve that mixes hot water and water from the water source and fills the bathtub, a hot-water pipe for connecting the bath mixing valve and the bathtub, and the bath provided in the hot-water pipe A hot water temperature sensor that detects the temperature of hot water from the mixing valve, a hot water valve that opens and closes the hot water pipe, and a hot water temperature that is detected by the hot water temperature sensor is set to a preset hot water temperature. Control means for adjusting the opening degree of the hot water mixing valve, and adjusting the opening degree of the bath mixing valve so that the temperature of hot water detected by the hot water temperature sensor becomes a preset hot water temperature setting temperature, The control means comprises a supply When starting hot hot water that fills the bathtub with a predetermined high temperature hot water, the hot water filling valve is set after the predetermined high temperature is changed to a predetermined low temperature. The hot water supply is started by opening the hot water filling valve, and the hot water filling temperature is returned to the predetermined high temperature when a certain time has elapsed after the hot water filling valve is opened.

  In addition, a first mixing valve that mixes hot water from a hot water storage tank for storing hot water and water from a water source and supplies the mixed water to a first hot water supply destination, and the first mixing valve and the first hot water supply destination are connected. A first hot water supply pipe for detecting the temperature of the hot water from the first mixing valve provided in the first hot water supply pipe, hot water from the hot water storage tank, and water from the water source. Provided in the second hot water supply pipe, a second hot water pipe for connecting the second mixed valve and the second hot water supply destination, and a second hot water supply pipe A second hot water temperature sensor for detecting the temperature of the hot water from the second mixing valve, and the first hot water temperature detected by the first hot water temperature sensor to be a preset first hot water temperature set temperature. While adjusting the opening of the mixing valve, the temperature of the hot water detected by the second hot water supply temperature sensor is set in advance. Control means for adjusting the opening of the second mixing valve so that the second hot water supply set temperature is achieved, and the control means gives priority to the first mixing valve over the second mixing valve. When the second hot water supply set temperature is set to be equal to or higher than a predetermined temperature, the second hot water supply set temperature is corrected to a constant lower temperature during the hot water supply from the first hot water supply pipe, When a certain time has elapsed after the hot water supply from the hot water supply pipe is started, the second hot water supply set temperature is returned to the temperature before correction.

  According to the present invention, when simultaneous hot water supply is started, the hot water supply set temperature (hot water set temperature) of the second mixing valve (bath mix valve) that starts hot water supply later is temporarily changed to a lower temperature. Suppressing a decrease in high temperature hot water flowing into the first hot water mixing valve (hot water mixing valve) that is supplying hot water and reducing the amount of fluctuation of the valve body position of the first hot water mixing valve (hot water mixing valve) Responsibility to external fluctuations such as an increase in the amount of hot water supply can be secured, so that significant temperature fluctuations can be suppressed, and overshooting of the hot water supply temperature on the previous hot water supply side when the amount of hot water supply on the previous hot water supply side is suppressed is suppressed. it can.

Schematic configuration diagram of the first embodiment of the present invention Time chart for explaining the operation of the present invention Schematic configuration diagram of the second embodiment of the present invention Time chart for explaining the conventional operation

Next, a hot water storage type hot water supply apparatus according to a first embodiment of the present invention will be described with reference to the drawings.
1 is a hot water storage tank for storing hot water, 2 is a water supply pipe connected to the lower part of the hot water storage tank 1 for supplying water from the water source, 3 is a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank 1, and 4 is branched from the water supply pipe 2 The hot water supply bypass pipe 5 is a hot water supply mixing valve (corresponding to the “first mixing valve” in the claims) that mixes hot water from the tap water pipe 3 and water from the water supply bypass pipe 4, and 6 is a shower or mixed water. Hot-water taps such as taps (corresponding to “first hot-water supply destination” in the claims), 7 is a hot-water pipe that leads hot water from the hot-water mixing valve 5 to the hot-water tap 6 (“first hot-water pipe in the claims”) 8), a hot water flow rate sensor 8 for counting the flow rate of hot water supplied to the hot water supply pipe 7, and 9 for detecting the temperature of the hot water mixed at the hot water mixing valve 5 provided downstream of the hot water flow rate sensor 8. Hot water temperature sensor (corresponds to “first hot water temperature sensor” in claims) It is.

  10 is a second hot water supply pipe branched from the hot water supply pipe 3, 11 is a second water supply bypass pipe branched from the water supply pipe 2, and 12 is hot water from the second hot water supply pipe 10 and water from the second water supply bypass pipe 11. Bath mixing valve (corresponding to “second mixing valve” in claims), 13 is a bathtub (corresponding to “second hot water supply destination” in claims), 14 is from bath mixing valve 12 A hot water filling pipe (corresponding to the “second hot water supply pipe” in the claims) that guides hot water to the bathtub 13, 15 is a hot water flow rate sensor that is provided in the hot water filling pipe 14 and counts the flow rate of hot water filled with hot water, 16 A hot water temperature sensor (corresponding to the “second hot water temperature sensor” in the claims) provided at the downstream of the hot water flow rate sensor 15 for detecting the temperature of hot water mixed by the bath mixing valve 12, 17 is a hot water pipe. 14 Opening and closing the flow path provided in the middle to start and stop hot water filling A hot water filling valve for performing (corresponding to the "off valve" in the claims).

  An overpressure relief valve 18 communicates with the hot water discharge pipe 3 to release the overpressure of the hot water storage tank 1, 19 is a pressure reducing valve provided in the middle of the water supply pipe 2 to reduce the water supply pressure applied to the hot water storage tank 1, and 20 within the hot water storage tank 1. An electric heater 21 provided in the hot water storage tank 1 as a heating means for heating the hot water is provided on the outer surface of the hot water storage tank 1 and is a plurality of hot water temperature sensors for detecting the hot water temperature.

  Reference numeral 22 denotes a remote controller provided in a bathroom or the like, and a display unit 23 for displaying various information related to the water heater (hot water set temperature, hot water set temperature, remaining hot water amount in the hot water storage tank 1, operating state of the water heater, etc.) A setting switch 24 for setting and operating a hot water supply set temperature, a hot water set temperature, an amount of hot water set for the bath, a hot water switch 25 for instructing the bathtub 13 to fill the bath with a set amount of hot water, and a high temperature for instructing a hot water supply operation A hot water switch 26 is provided.

  Reference numeral 27 denotes a hot water supply flow sensor 8, a hot water supply temperature sensor 9, a hot water flow sensor 15, a hot water temperature sensor 16, and hot water storage temperature sensor 21 detected values, and a hot water supply mixing valve 5, bath mixing valve 12, hot water filling valve 17, Control means for controlling the operation of the electric heater 20 and communicably connected to the remote controller 22. The control means 270 stores a program for controlling the operation of the water heater in advance, and has a calculation, comparison, storage function, and clock function.

  The control means 27 includes a hot water supply control unit 28 for controlling hot water supply and a hot water control unit 29 for controlling hot water filling. The hot water supply control unit 28 opens the hot water tap 6 and the hot water supply flow rate sensor 8 controls the flow rate. Upon detection, the hot water supply mixing valve is set so that the temperature detected by the hot water supply temperature sensor 9 matches the hot water supply set temperature preset by the user with the remote controller 22 (corresponding to the “first hot water set temperature” in the claims). The opening degree of 5 is feedback controlled.

  When the hot water filling switch 25 of the remote controller 22 is turned on, the hot water filling control unit 29 opens the hot water filling valve 17 and the temperature detected by the hot water filling temperature sensor 16 is set by the user using the remote controller 22. The opening of the bath mixing valve 12 is feedback-controlled so as to match the set temperature (corresponding to “second hot water set temperature” in the claims), and the flow rate accumulated by the hot water flow rate sensor 15 from the start of hot water filling is determined. When the bath setting hot water amount set by the user with the remote controller 22 is reached, the hot water filling valve 17 is closed and the hot water filling is finished. When the hot water hot water switch 25 of the remote controller 22 is turned on, the hot water filling set temperature is changed to a predetermined high temperature (60 ° C. in this case), the hot water filling valve 17 is opened, and the hot water filling temperature is changed. When the opening degree of the bath mixing valve 12 is feedback-controlled so that the temperature detected by the sensor 16 coincides with a predetermined high temperature, the hot water filling flow rate sensor 15 reaches a predetermined amount when the flow rate accumulated from the start of the hot water supply reaches a predetermined amount. The tension valve 17 is closed to end the hot water supply.

  Next, when the high-temperature hot water supply switch 26 is turned on during hot water supply for which the hot water supply flow rate sensor 8 detects the flow rate, the hot water filling control unit 29 sets the hot water filling set temperature to a predetermined high temperature (in this case, 60). The hot water filling valve 17 is opened after the temperature is changed to a temperature lower than the predetermined temperature (50 ° C. in this case), and the temperature detected by the hot water temperature sensor 16 matches the temperature lower than the predetermined high temperature. In addition, the opening degree of the bath mixing valve 12 is feedback-controlled.

  When the hot water filling control unit 29 determines that a certain time has passed since the hot water filling valve 17 is opened, the hot water filling temperature sensor 16 returns the hot water filling set temperature to a predetermined high temperature and detects it. The opening degree of the bath mixing valve 12 is feedback-controlled so that the temperature of the hot water filling valve 12 is equal to a predetermined high temperature, and the hot water filling valve 17 is turned on when the flow rate accumulated by the hot water filling flow rate sensor 15 reaches a predetermined amount. Close the hot water bath to finish. In addition, when the stop of hot water supply is detected during hot hot water supply, the original hot water filling set temperature is immediately restored.

  In this way, at the start of hot hot water supply during hot water supply, the temperature of the hot hot water supply is changed lower when the hot water filling valve 17 is opened. By reducing the amount of hot water flowing into the hot water side of the valve 12, it is possible to suppress a decrease in hot water flowing into the hot water side of the hot water mixing valve 5 to suppress fluctuations in the hot water temperature, as shown in FIG. Thus, even if there is a sudden increase in the flow rate of hot water supply, the amount of fluctuation in the valve body position of the hot water supply mixing valve 5 is also reduced compared to the conventional case, so the hot water supply mixing valve 5 is subjected to accurate feedback control with high control response. And overshoot of the hot water supply temperature on the hot water supply side can be suppressed.

  Further, in the first embodiment, at the time of normal hot water filling in which the hot water filling set temperature is lower than that of the high-temperature hot water, the hot water filling set temperature is changed to a constant temperature lower when the hot water filling valve 17 is opened during hot water supply. I am doing so. In this case, the constant temperature is preferably set to a value smaller than the constant temperature at the time of hot hot water. It should be noted that during normal hot water filling, which is lower than the hot water supply hot water, when the hot water filling valve 17 is opened during hot water supply, it is possible not to change the hot water filling set temperature.

  Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the second hot water supply destination is the second hot water tap 30, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  31 is a second hot water mixing valve provided in parallel with the hot water mixing valve 5, 32 is a second hot water pipe leading the hot water from the second hot water mixing valve 31 to the second hot water tap 30, and 33 is a second hot water pipe 32. A second hot water supply flow sensor 34 for counting the flow rate of hot water supplied to the hot water, 34 is a second hot water supply temperature for detecting the temperature of the hot water mixed by the second hot water supply mixing valve 31 provided downstream of the second hot water supply flow sensor 33. It is a sensor.

  A heat pump heating means 35 circulates and heats hot water in the hot water storage tank 1, a compressor 36 that compresses the refrigerant, a hot water supply heat exchanger 37 that exchanges heat between the refrigerant and hot water, an expansion valve 38 that decompresses the refrigerant, a low pressure An air heat exchanger 39 for evaporating the refrigerant is connected in an annular shape with a refrigerant pipe, and the water side of the hot water supply heat exchanger 37 is connected to the hot water storage tank 1 via a circulation circuit 40 and a heating circulation pump 41. Thus, the hot water taken out from the lower part of the hot water storage tank 1 is heated and returned to the upper part of the hot water storage tank 1.

  The control means 27 is provided with a hot water supply control unit 27 and a second hot water supply control unit 42. The second hot water supply control unit 40 detects the flow rate when the second hot water supply tap 30 is opened and the second hot water supply flow rate sensor 33 detects the flow rate. Then, the opening degree of the second hot-water supply mixing valve 31 is feedback-controlled so that the temperature detected by the second hot-water supply temperature sensor 34 matches the second hot-water supply set temperature preset by the user with the remote controller 22.

  Here, the control means 27 sets the priority of one of the hot water supply mixing valve 5 and the second hot water supply mixing valve 31 high in preparation for the case where there is hot water supply in both the hot water tap 6 and the second hot water tap 30 at the same time. In the hot water supply control unit 28 or the second hot water supply control unit 42, when the higher priority side is hot water supply, the hot water supply set temperature on the lower priority side is higher than a predetermined high temperature (here, 50 ° C.). The set temperature of the hot water supply is set to a constant low temperature, and when a certain amount of time has passed while the hot water supply at the lower priority side is started, the lower hot water supply set temperature is restored to the original temperature. The temperature is set back to the set temperature.

  The second hot-water tap 30 is opened during hot water supply from the hot-water tap 6 when the priority of the hot-water supply mixing valve 5 is set high and the second hot-water supply set temperature is set to a predetermined high temperature (60 ° C. in this case). The operation in the situation where the hot water is supplied simultaneously will be described.

  When the second hot-water supply controller 30 detects the flow rate when the second hot-water tap 30 is opened while the hot-water supply flow rate sensor 8 detects the flow rate, the second hot-water supply flow sensor 33 detects the flow rate. The second hot water supply set temperature is changed to a temperature (here 50 ° C.) lower than a predetermined high temperature (here 60 ° C.), and the temperature detected by the second hot water temperature sensor 34 is constant above the predetermined high temperature. The opening degree of the second hot water supply mixing valve 31 is feedback controlled so as to coincide with the low temperature.

  And if the 2nd hot water supply control part 42 judges that fixed time has passed in the simultaneous hot water supply state from the hot water supply start from the 2nd hot water tap 30, it will return 2nd hot water supply preset temperature to the original temperature, and will be 2nd hot water supply temperature The opening degree of the second hot water supply mixing valve 31 is feedback-controlled so that the temperature detected by the sensor 34 matches the original second hot water supply set temperature, and the control ends when the second hot water supply flow rate sensor 33 no longer detects the flow rate. I am doing so. When a hot water supply stop on the higher priority side is detected during simultaneous hot water supply, the hot water supply set temperature on the lower priority side is immediately returned to the original hot water supply set temperature.

  In this way, when the high-priority hot water supply is started on the low-priority side while the high-priority side is hot-water supply, the hot-water supply set temperature on the low-priority side is corrected to be lower. By reducing the amount of high-temperature water flowing into the hot water side of the hot water mixing valve 31, the decrease in high temperature water flowing into the hot water side of the hot water mixing valve 5 can be suppressed, and fluctuations in the hot water temperature can be suppressed. Thus, even if there is a sudden increase in the flow rate of hot water supply, the amount of fluctuation in the valve body position of the hot water supply mixing valve 5 is also reduced compared to the conventional case, so the hot water supply mixing valve 5 is subjected to accurate feedback control with high control response. And overshoot of the hot water supply temperature on the hot water supply side can be suppressed.

  In the second embodiment, when the hot water supply set temperature on the lower priority side is lower than the predetermined high temperature, the hot water supply on the lower priority side is started during the hot water supply on the higher priority side. The hot water supply set temperature on the lower priority side is not changed. Note that the priority may be switched by the control means 27 autonomously or according to user settings.

  In addition, this invention is not limited to said embodiment, A various change is possible in the range which does not change the summary of invention. For example, a mist generator for a mist sauna may be used as the second hot water supply destination instead of a bathtub.

1 Hot water storage tank 5 Hot water supply mixing valve (first mixing valve)
6 Hot water tap (first hot water supply destination)
7 Hot water supply pipe (1st hot water supply pipe)
9 Hot water temperature sensor (1st hot water temperature sensor)
12 Bath mixing valve (second mixing valve)
13 Bathtub (second hot water supply destination)
14 Hot water filled pipe (second hot water pipe)
16 Hot water temperature sensor (second hot water temperature sensor)
17 Hot water filling valve (open / close valve)
27 Control means 30 2nd hot-water tap (2nd hot-water supply destination)
31 Second hot water mixing valve 32 Second hot water pipe 34 Second hot water temperature sensor

Claims (4)

  A first mixing valve for mixing hot water from a hot water storage tank for storing hot water and water from a water source and supplying the mixed water to a first hot water supply destination, and the first mixing valve and the first hot water supply destination are connected. A first hot water supply pipe, a first hot water temperature sensor that is provided in the first hot water pipe and detects the temperature of hot water from the first mixing valve, hot water from the hot water storage tank, and water from the water source are mixed. A second mixing valve for filling the second hot water supply destination, a second hot water supply pipe for connecting the second mixing valve and the second hot water supply destination, and the second hot water supply pipe, A first hot water temperature sensor that detects the temperature of hot water from the second mixing valve, an on-off valve that opens and closes the second hot water supply pipe, and a hot water temperature that is detected by the first hot water temperature sensor are preset. While adjusting the opening of the first mixing valve so as to be a hot water supply set temperature, the second hot water temperature sensor Control means for adjusting the opening of the second mixing valve so that the temperature of the hot water to be detected becomes a preset second hot water supply temperature, and the control means has a predetermined second hot water supply temperature. When the hot water supply from the second hot water supply pipe is started during the hot water supply from the first hot water supply pipe when the temperature is set to be higher than the temperature, the temperature lower than the set temperature of the second hot water supply set temperature The hot water storage type hot water supply apparatus is characterized in that, after being temporarily changed, the on-off valve is opened to start hot water supply from the second hot water supply pipe.   2. The hot water storage type hot water supply apparatus according to claim 1, wherein the control means is configured to return the second hot water supply set temperature to a temperature before the change when a predetermined time elapses after the opening / closing valve is opened.   A hot water mixing valve that mixes hot water from a hot water storage tank for storing hot water and water from a water source and supplies the mixed hot water to a hot water tap, a hot water pipe for connecting the hot water mixing valve and the hot water tap, and the hot water pipe A hot water supply temperature sensor for detecting the temperature of hot water from the hot water supply mixing valve, a bath mixing valve for mixing hot water from the hot water storage tank and water from the water source, and filling the bathtub with water, and the bath mixing A hot water pipe for connecting the valve and the bathtub, a hot water temperature sensor provided on the hot water pipe for detecting the temperature of hot water from the bath mixing valve, and a hot water valve for opening and closing the hot water pipe And adjusting the opening of the hot water mixing valve so that the temperature of the hot water detected by the hot water temperature sensor becomes a preset hot water temperature, and the temperature of the hot water detected by the hot water temperature sensor is preset. The set temperature reaches Control means for adjusting the opening of the bath mixing valve, and the control means starts the hot water hot water filling the bathtub with hot water of a predetermined high temperature during hot water supply. The temperature setting is changed from the predetermined high temperature to the temperature lower than the predetermined temperature, and then the hot water filling valve is opened to start hot hot water supply. The hot water storage type hot water supply device is characterized in that the temperature is returned to the predetermined high temperature.   A first mixing valve for mixing hot water from a hot water storage tank for storing hot water and water from a water source and supplying the mixed water to a first hot water supply destination, and the first mixing valve and the first hot water supply destination are connected. A first hot water supply pipe, a first hot water temperature sensor that is provided in the first hot water pipe and detects the temperature of hot water from the first mixing valve, hot water from the hot water storage tank, and water from the water source are mixed. A second mixing valve for filling the second hot water supply destination, a second hot water supply pipe for connecting the second mixing valve and the second hot water supply destination, and the second hot water supply pipe, A second hot water temperature sensor for detecting the temperature of hot water from the second mixing valve, and the first mixing valve so that the temperature of the hot water detected by the first hot water temperature sensor becomes a preset first hot water temperature setting temperature. And the temperature of hot water detected by the second hot water supply temperature sensor is preset. Control means for adjusting the opening of the second mixing valve so that the second hot water supply set temperature is reached, and the control means sets the priority of the first mixing valve higher than that of the second mixing valve. When the second hot water supply set temperature is set to be equal to or higher than a predetermined temperature, during the hot water supply from the first hot water supply pipe, the second hot water supply set temperature is corrected to a constant lower temperature, and the second hot water supply pipe is corrected. The hot water storage type hot water supply apparatus is characterized in that the second hot water supply set temperature is returned to the temperature before correction when a certain time has elapsed since the start of hot water supply.

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