JP3371703B2 - Hot water storage system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type hot water supply device for boiling water in a hot water storage tank by a heat pump utilizing electric power.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a hot water storage type hot water supply apparatus is provided with indoor units 11 and 12 and an outdoor unit 13, and is connected to the outdoor unit 13 and the outdoor heat of the outdoor unit 13 is connected to the outdoor unit 13. There is a unit provided with a tank unit 14 for boiling the hot water in the hot water storage tank 1 by a heat pump type refrigerant circuit that uses the heat taken from the outside air by the exchanger. This hot water supply type hot water supply apparatus heats up the water in the hot water storage tank 1 with a heat pump type refrigerant circuit, and uses a heater 2 (shown in FIG. 6) provided on the bottom side of the hot water storage tank 1 at midnight hours when the electricity charge is low. Boil to a higher temperature. A thermistor Rth1 (shown in FIG. 6) for detecting the temperature Dth1 of the water in the hot water storage tank 1 is attached to the lower side of the hot water storage tank 1.

In the hot water storage type hot water supply apparatus having the above configuration, as shown in FIG. 7, when it is determined that the temperature Dth1 of the water in the hot water storage tank 1 detected by the thermistor Rth1 is lower than the set temperature DS1 (step S21). The thermostat is turned on, and the water in the hot water storage tank 1 is boiled up by the heat pump type refrigerant circuit (step S22).

Next, when it is determined that the temperature Dth1 of the water in the hot water storage tank 1 detected by the thermistor Rth1 is equal to or higher than the set temperature DS1 (step S23), the thermostat is turned off and the water in the hot water storage tank 1 is heated up. Is stopped (step S24).

Further, as shown in FIG. 8, when it is determined that it is in the midnight time zone (step S31), the thermistor Rth is set.
It is determined whether or not the temperature Dth1 of the water in the hot water storage tank 1 detected by 1 is lower than the set temperature DS2 (at step S32).
When it is determined that the temperature Dth1 is lower than the set temperature DS2, the heater 2 is turned on to boil the water in the hot water storage tank 1 (step S33).

Next, when it is determined that the temperature Dth1 of the water in the hot water storage tank 1 detected by the thermistor Rth1 is equal to or higher than the set temperature DS2 (step S34), the heater 2 is turned off and the water in the hot water storage tank 1 is turned off. Stop boiling (step S35).

[0007]

By the way, in the hot water storage type hot water supply apparatus described above, the entire amount of water in the hot water storage tank 1 is boiled even in the daytime hours when the electricity rate is high, and the hot water is rarely used in the midnight hours. Nevertheless, since the heater 2 is repeatedly turned on and off in order to keep the temperature of the water in the hot water storage tank 1 at the set temperature DS2, there is a drawback that the operating cost is high.

Therefore, an object of the present invention is to provide a hot water storage type hot water supply device which can reduce the operating cost.

[0009]

To achieve the above object, a hot water storage type hot water supply apparatus according to a first aspect of the present invention is a hot water storage type hot water supply apparatus in which water in a hot water storage tank is boiled by a heat pump utilizing electric power . Each water of each stage
Temperature detection means for detecting the temperature of the
Depending on the temperature, the partial amount of water in the hot water storage tank is boiled by the heat pump, while at the time when the electricity rate is low, it depends on the temperature of the water detected by the temperature detecting means.
Then, the entire amount of water in the hot water storage tank is boiled by the heat pump.

According to the hot water storage type hot water supply device of claim 1,
The operation cost can be reduced because the boiling amount exceeding the partial amount of water in the hot water storage tank is not boiled during the time when the electricity rate is high, and the entire amount of water in the hot water storage tank is boiled by the heat pump during the time when the electricity rate is low.

A hot water storage type hot water supply apparatus according to a second aspect is the hot water storage type hot water supply apparatus according to the first aspect, further comprising a heater for boiling water in the hot water storage tank, the temperature of the water in the hot water storage tank and a set temperature. Based on the above, the heater is turned on so as to reach the set temperature at the end of the time period when the electricity rate is low, so that the entire amount of water in the hot water storage tank is boiled up.

According to the hot water storage type hot water supply device of claim 2,
After boiling the water in the hot water tank as much as possible with a heat pump that is more efficient than a heater during the time when the electricity rate is low, that is, at night, when the time when the electricity rate is low ends, the water in the hot water tank is targeted. Since the heater boils up to the set temperature to be set, for example, there is no possibility that the boiling temperature is lowered by heat dissipation by the morning when the boiling is completed by the heater at 3 am and the hot water is heated again. Therefore, heat loss due to heat radiation until the start of hot water supply is reduced, so that the operating time of the heater can be shortened and efficient boiling can be performed by the heater.

Further, the hot water storage type hot water supply apparatus according to claim 3, in the hot water storage type hot water supply apparatus according to claim 2, in low on the SL electric charge time zone, every predetermined time, the hot water storage detected by said temperature detecting means Based on the temperature of the water in the tank and the boiling capacity of the heater, the heater is turned on until the end of the time when the electricity rate is low until the end of the time when the electricity rate is low. At the end of, the heater boiling determination means for determining whether or not the set temperature is reached, and the heater boiling determination means, based on the temperature of the water in the hot water storage tank and the boiling capacity of the heater, It is determined that the set temperature will be reached at the end of the low electricity rate time period by turning on the heater from the time set by each hour to the end of the low electricity rate time zone. If that is characterized by comprising a heater control means for turning on the heater.

According to the hot water storage type hot water supply apparatus of claim 3,
When the electricity rate is low (for example, from 11:00 pm to 7:00 am on the next day), the heater boiling determination means is based on the temperature of water in the hot water storage tank and the boiling capacity of the heater. When it is determined that the set temperature is reached at the end of the low electricity rate time period by turning on the heater from the time determined for each of the predetermined times to the end of the low electricity rate time zone, the heater control means turns on the heater. After that, the time when the electricity price is low ends,
Alternatively, the heater is turned off when the temperature of the water in the hot water storage tank reaches or exceeds the set temperature. Therefore, it is possible to accurately determine the boiling start time of the heater in which the temperature of the water in the hot water storage tank reaches the set temperature at the end of the time period when the electricity rate is low.

A hot water storage type hot water supply apparatus according to a fourth aspect of the present invention is the hot water storage type hot water supply apparatus according to the third aspect, wherein it is determined whether or not the temperature of the water in the hot water storage tank detected by the temperature detection means is equal to or higher than the preset temperature. The heater control means is provided with a temperature determination means for determining, and when the temperature determination means determines that the temperature of the water in the hot water storage tank detected by the temperature detection means is equal to or higher than the set temperature, the heater control means turns the heater on. It is characterized by turning off.

According to the hot water storage type hot water supply apparatus of claim 4,
After the heater control means turns on the heater, when the temperature determination means determines that the temperature of the water in the hot water storage tank detected by the temperature detection means is equal to or higher than the set temperature, the heater control means turns off the heater. Therefore, for example, when the water in the hot water storage tank boiled up to the set temperature before the end of the time period when the electricity rate is low, the heater can be immediately turned off to prevent excessive boiling. Also, the heater is turned off at the end of the low electricity rate period.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The hot water storage type hot water supply apparatus of the present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 is a schematic view of a main part of a hot water storage type hot water supply apparatus according to an embodiment of the present invention. The hot water storage type hot water supply device has the same configuration as the indoor units 11 and 12, the outdoor unit 13, and the tank unit 14 connected to the outdoor unit 13 shown in FIG. As shown in FIG. 1, the tank unit 14 includes a hot water storage tank 1, a heater 2 arranged in the hot water storage tank 1, a control unit 3 for controlling boiling of water in the hot water storage tank 1, and It has a hot water supply heat exchanger 4 whose both ends are connected to an upper part and a lower part of the hot water storage tank 1, and a pump 5 arranged between the lower part of the hot water storage tank 1 and the hot water supply heat exchanger 4. Further, the hot water storage tank 1 has thermistors Rth1, Rth2, Rth as temperature detecting means for detecting the temperature of each of the upper, middle and lower water in the hot water storage tank 1.
3 is attached. A heat pump type refrigerant circuit (hereinafter, referred to as a heat pump) constituted by a compressor, an expansion valve, an outdoor heat exchanger and a hot water supply heat exchanger 4 (not shown) of the outdoor unit 13 causes the water in the hot water storage tank 1 to be pumped by the pump 5. The water in the hot water storage tank 1 is boiled by the heater 2 while being circulated and boiled.

The control unit 3 is composed of a microcomputer, an input / output circuit, etc., and includes the thermistors Rth1 and Rth.
A heater boiling discriminating section 3a as a heater boiling discriminating means for discriminating whether or not to start boiling by the heater 2 in response to the outputs of th2 and Rth3, and the temperature of the water in the hot water storage tank 1 is equal to or higher than a set temperature. As a temperature determination unit 3b as a temperature determination unit for determining whether or not it is, as a heater control unit for controlling ON / OFF of the heater 2 based on the determination results of the heater boiling determination unit 3a and the temperature determination unit 3b. Heater control section 3c.

FIG. 2 is a flow chart showing a hot water supply operation process by the heat pump of the control unit 3 of the hot water storage type hot water supply apparatus.

The operation of the control unit 3 will be described below with reference to the flowchart of FIG.

First, when the process starts, step S
At 1, it is determined whether it is the midnight time zone. That is, it is determined whether or not the current time is from 11:00 pm, which is the nighttime time zone when the electricity rate of the time zone fee system is low, to 7:00 am the next day. Then, when it is determined in step S1 that it is the midnight time zone, the process proceeds to step S2.

Next, in step S2, it is determined whether or not the temperature Dth1 of the water in the hot water storage tank 1 detected by the thermistor Rth1 is less than the set temperature DS1, and it is determined that the temperature Dth1 is less than the set temperature DS1. In step S3, the thermostat is turned on and the water in the hot water storage tank 1 is boiled by the heat pump.

Next, in step S4, the thermistor R
If it is determined that the temperature Dth1 of the water in the hot water storage tank 1 detected by th1 is equal to or higher than the set temperature DS1 and the temperature Dth1 is equal to or higher than the set temperature DS1, the process proceeds to step S5. On the other hand, when it is determined in step S4 that the temperature Dth1 is lower than the set temperature DS1, the process returns to step S3 and steps S3 and S4 are repeated.

Next, in step S5, the thermostat is turned off to stop boiling the water in the hot water storage tank 1 by the heat pump, and the process returns to step S1.

On the other hand, if it is determined in step S1 that it is not in the midnight time, the process proceeds to step S6, and it is determined whether or not the temperature Dth2 of the water in the hot water storage tank 1 detected by the thermistor Rth2 is less than the set temperature DS1, and the temperature is determined. If it is determined that Dth2 is less than the set temperature DS1, the process proceeds to step S7. Next, in step S7, the thermostat is turned on and the water in the hot water storage tank 1 is boiled by the heat pump. On the other hand, if it is determined in step S6 that the temperature Dth2 of the water in the hot water storage tank 1 is equal to or higher than the set temperature DS1, the process returns to step S1.

Next, in step S8, the thermistor R
If it is determined that the temperature Dth2 of the water in the hot water storage tank 1 detected by th2 is equal to or higher than the set temperature DS1, and if it is determined that the temperature Dth2 is equal to or higher than the set temperature DS1, the process proceeds to step S9. On the other hand, if it is determined in step S8 that the temperature Dth2 is lower than the set temperature DS1, the process returns to step S7 and steps S7 and S8 are repeated.

Next, in step S9, the thermostat is turned off to stop boiling the water in the hot water storage tank 1, and the process returns to step S1.

FIG. 3 is a flow chart showing the operation of the hot water supply operation by the heater 2 of the controller 3 of the hot water storage type hot water supply device.

The operation of the control unit 3 will be described below with reference to the flowchart of FIG.

First, when the processing is started, step S
At 11, it is determined whether it is the midnight time zone. That is, it is determined whether or not the current time is from 11:00 pm, which is a time zone in which the nighttime electricity rate of the time zone fee system is low, to 7:00 am on the next day. Then, if it is determined in step S11 that it is in the midnight time zone, the process proceeds to step S12, while if it is determined that it is not in the midnight time zone, step S11 is repeated.

Next, in step S12, it is determined whether or not the following equation is established.

(Dth1 + Dth2 + Dth3) / 3 + A × T ≤ DS 2 [Equation 1] Dth1: Temperature detected by thermistor Rth1 Dth2: Temperature detected by thermistor Rth2 Dth3: Temperature detected by thermistor Rth3 A: Time Heater heating capacity coefficient (constant) T per hit: Remaining time in the midnight time period When it is determined that [Equation 1] is satisfied in step S12, the process proceeds to step S13, the heater 2 is turned on, and the hot water storage tank 1 Boil water.

Next, in step S14, the temperature Dth2 of the water in the hot water storage tank 1 detected by the thermistor Rth2.
Is above the set temperature DS2, and if the temperature Dth2 is above the set temperature DS2, the routine proceeds to step S15. On the other hand, in step S14, the temperature Dth2 is the set temperature DS
If it is determined that it is less than 2, the process returns to step S13 and steps S13 and S14 are repeated.

Next, in step S15, the heater 2 is turned off to stop the boiling of water in the hot water storage tank 1, and then the process returns to step S11.

On the other hand, if it is determined in step S12 that [Equation 1] is not satisfied, the process proceeds to step S16, waits for a certain time by the timer count, and then returns to step S11 again.

FIG. 4 shows the temperature change of the water in the hot water storage tank 1 during the hot water supply operation by the heat pump and the heater 2. In FIG. 4, the vertical axis represents the temperature Dth2 detected by the thermistor Rth2, and the horizontal axis represents the time axis. Further, the heater boiling line is shown by a dotted line based on the boiling capacity of the heater 2 so that the temperature of the water in the hot water storage tank 1 becomes the set temperature DS2 at the end of the midnight time zone, that is, at 7:00 AM. .

In FIG. 4, boiling is repeated by a heat pump so that the temperature of the water in the hot water storage tank 1 becomes DS1. And midnight hours (11:00 PM to 7:00 AM)
Then, when the average temperature (Dth1 + Dth2 + Dth3) / 3 detected by the thermistors Rth1, Rth2, and Rth3 is on the heater boiling line, when the heater 2 is turned on, the set temperature DS2 or more is reached at the end of the midnight time zone. , Heater 2
Turn off.

As described above, the hot water storage type hot water supply apparatus does not boil more than a partial amount of water in the hot water storage tank 1 during a time period when the electricity charge is high, and boiles only an appropriate amount necessary for hot water supply. In the low-price time zone, the entire amount of water in the hot water storage tank 1 is boiled up by the heat pump, so that the operating cost can be reduced.

In addition, the water in the hot water storage tank 1 is boiled up as much as possible by a heat pump that is more efficient than the heater 2, so that the heater 2 can be operated at a time when the electricity charge is low, that is, at night.
To boil. Also, for example, when the boiling by the heater 2 is 3:00 am, the hot water temperature is lowered by heat radiation by the morning when hot water supply is started, and it is not necessary to boil again. That is, the boiling temperature is set to the set temperature immediately before the hot water supply is started, so that the heat loss due to the heat radiation until the hot water supply is started is small, and the efficient boiling by the heater 2 can be performed.

In addition, during the time period when the electricity rate is low from 11:00 pm to 7:00 am the next day, the thermistors Rth1 and Rt are determined by the heater boiling determination unit 3a at predetermined intervals.
Average temperature detected by h2 and Rth3 (Dth1 + Dth2 + Dt
By turning on the heater 2 based on h3) / 3 and the boiling capacity (heater heating capacity coefficient) of the heater 2 until the end of the night time zone when the electricity rate is low from the time fixed at each of the above-mentioned predetermined times. When it is determined whether the set temperature DS2 is reached at the end of the night time when the electricity rate is low, the heater control unit 3c
Since the heater 2 is turned on, it is possible to accurately determine the boiling start time by the heater 2 at which the water in the hot water storage tank 1 reaches the set temperature DS2 at the end of the time period when the electricity rate is low.

Thereafter, when the temperature discriminating unit 3b discriminates that the temperature of the water in the hot water storage tank 1 detected by the thermistor Rth2 is equal to or higher than the set temperature DS2, the heater control unit 3c.
Since the heater 2 is turned off, if, for example, the water in the hot water storage tank 1 boiled to the set temperature DS2 before the end of the low electricity rate time period, the heater 2 is immediately turned off to prevent excessive boiling. be able to. Further, when the low electricity rate time period ends, the heater 2 is turned off.

In the above embodiment, the tank unit 1 is used in the air conditioner composed of the indoor units 11 and 12 and the outdoor unit 13.
Although the hot water storage type hot water supply device to which 4 is connected has been described, the hot water storage type hot water supply device is not limited to this, and any device capable of boiling water in the hot water storage tank by a heat pump using electric power may be used.

In the above embodiment, the heater 2 is turned on when [Equation 1] is satisfied during the nighttime period, and then,
When the temperature Dth2 detected by the thermistor Rth2 exceeds the set temperature DS2, the heater 2 is turned off, but the temperatures Dth1, Dth2, detected by the thermistors Rth1, Rth2, Rth3 are
The heater may be turned off when the average temperature of Dth3 exceeds the set temperature.

Further, in the above embodiment, the time period when the electricity charge is low is from 11:00 pm to 7:00 am on the next day, but the electricity charge system may be appropriately applied according to the electricity charge system established by the electric power company or the like.

[0046]

As apparent from foregoing description, the hot water storage type hot-water supply device of the invention of claim 1, in storage type water heater to raise boiling the water in the hot water storage tank by a heat pump utilizing the power, each in the hot water storage tank Check the temperature of each water
Comprising a plurality of temperature detection means for output, the high electrical charge time zone, the temperature of the water detected by the double-temperature detecting means
According to the above, while heating the partial amount of water in the hot water storage tank by the heat pump, while the electricity rate is low,
Depending on the temperature of the water detected by the multiple temperature detection means
Then, the entire amount of water in the hot water storage tank is boiled by the heat pump.

Therefore, according to the hot-water storage type hot water supply apparatus of the invention of claim 1, boiling is not performed in excess of a partial amount of water in the hot-water storage tank during a time when the electricity rate is high, and hot water is stored during a time when the electricity rate is low. Since the entire amount of water in the tank is boiled by the heat pump, the operating cost can be reduced.

A hot water storage type hot water supply apparatus according to a second aspect of the present invention is the hot water storage type hot water supply apparatus according to the first aspect, further comprising a heater for boiling up the water in the hot water storage tank, and setting the temperature of the water in the hot water storage tank. Based on the temperature, the heater is turned on so as to reach the set temperature at the end of the time period when the electricity charge is low, so that the entire amount of water in the hot water storage tank is boiled.

Therefore, according to the hot water storage type hot water supply apparatus of the second aspect of the present invention, the water in the hot water storage tank is boiled up as much as possible by the heat pump having a higher efficiency than the heater, and the water is boiled by the heater during a low electricity rate period, that is, at night. By raising the temperature and boiling it up to the target set temperature at the end of the low electricity rate period, there is little heat loss due to heat dissipation until the start of hot water supply, and efficient heating by the heater can be performed.

[0050] Also, the hot water storage type hot-water supply device of the invention of claim 3, in the hot water storage type hot water supply apparatus according to claim 2, in low time zone electric rates, every predetermined time, the hot water storage detected by said temperature detecting means Whether to reach the set temperature at the end of the low electricity rate time period by turning on the heater based on the temperature of the water in the tank and the boiling capacity of the heater until the end of the low electricity rate time period Is determined by the heater boiling determination means, and the heater boiling determination means determines, based on the temperature of the water in the hot water storage tank and the boiling capacity of the heater, the end of the low electricity rate period from the time determined at each of the above-mentioned predetermined times. When it is determined that the set temperature will be reached at the end of the time period when the electricity rate is low by turning on the heater until then, the heater control means turns on the heater.

Therefore, according to the hot water storage type hot water supply apparatus of the third aspect of the present invention, the heater boiling determination means determines the time determined at each predetermined time based on the temperature of the water in the hot water storage tank and the boiling ability of the heater. From when the heater is turned on until the end of the low electricity rate time zone, it is determined that the set temperature will be reached at the end of the low electricity rate time zone.
Since the heater control means turns the heater on, the heater is turned off at the end of the time period when the electricity rate is low, or the heater is turned off when the water in the hot water storage tank boiled up to the set temperature. It is possible to accurately determine the boiling start time of the heater at which the water in the hot water storage tank reaches the set temperature at the end of the band.

Further, a hot water storage type hot water supply apparatus according to a fourth aspect of the present invention is the hot water storage type hot water supply apparatus according to the third aspect, wherein the heater control means is provided in the hot water storage tank whose temperature determination means is detected by the temperature detection means. When it is determined that the water temperature is equal to or higher than the set temperature, the heater is turned off.

Therefore, according to the hot water storage type hot water supply device of the invention of claim 4, for example, when the water in the hot water storage tank boiled up to the set temperature before the end of the time period when the electricity rate is low,
Immediately turn off the heater to prevent excessive boiling. Also, the heater is turned off at the end of the low electricity rate period.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part of a hot water storage type hot water supply apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a hot water supply operation process by a heat pump of a control unit of the hot water storage type hot water supply apparatus.

FIG. 3 is a flowchart showing control of hot water supply operation by a heater of the control unit of the hot water storage type hot water supply device.

FIG. 4 is a diagram showing a change in boiling temperature by a heat pump and a heater of the hot water storage type hot water supply device.

FIG. 5 is a schematic view of a conventional hot water storage type hot water supply device.

FIG. 6 is a schematic view of a hot water storage tank of the hot water storage type hot water supply device.

FIG. 7 is a flowchart showing a hot water supply operation process by the heat pump of the hot water storage type hot water supply apparatus.

FIG. 8 is a flowchart showing a hot water supply operation process by the heater of the hot water storage type hot water supply apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hot water storage tank, 2 ... Heater, 3 ... Control part, 3a ... Heater boiling determination part, 3b ... Temperature determination part, 3c ... Heater control part, 4 ... Hot water supply heat exchanger, 5 ... Pump, Rth1, Rth2, Rth
3 ... Thermistor.

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F24H 1/00 611 F24H 1/18 F24H 1/18 302

Claims (4)

(57) [Claims] 1. A hot water storage type hot water supply apparatus in which water in a hot water storage tank (1) is boiled by a heat pump using electric power, and the temperature of each water in each stage in the hot water storage tank (1) is detected.
Temperature detection means (Rth1, Rth2, Rth3) , and the above-mentioned temperature detection means (Rth2) is used during a time period when the electricity charge is high.
According to the temperature of the water detected by the hot water storage tank
While part of the water in (1) is boiled by the heat pump, the temperature detecting means (Rth1) is used during the time when the electricity rate is low.
According to the temperature of the water detected by the hot water storage tank
(1) A hot water storage type hot water supply device characterized in that the entire amount of water in the water is boiled by the heat pump. 2. The hot water storage type hot water supply apparatus according to claim 1, further comprising a heater (2) for boiling water in the hot water storage tank (1), and setting the temperature of the water in the hot water storage tank (1) and the setting. Based on the temperature, by turning on the heater (2) so as to reach the set temperature at the end of the low electricity rate time period,
A hot water storage type hot water supply device characterized by boiling up all of the water in the hot water storage tank (1). 3. A storage-type water heater according to claim 2, in low time zone on the Symbol electricity rate, every predetermined time, the temperature detection means (Rth1, Rth2, Rth3) the hot water storage tank detected by Based on the temperature of the water in (1) and the boiling capacity of the heater (2), from the time fixed at each of the predetermined times to the end of the low electricity rate time period, the heater
By turning on (2), the heater boiling determination means (3a) for determining whether or not the set temperature is reached at the end of the low electricity rate time zone, and the heater boiling determination means (3a), Hot water storage tank
(1) Turn on the heater (2) from the time determined at each predetermined time to the end of the low electricity rate time period based on the temperature of water in the heater and the boiling capacity of the heater (2). A hot water storage type hot water supply apparatus comprising: a heater control means (3c) for turning on the heater (2) when it is determined that the set temperature is reached at the end of the low electricity rate time period. 4. The hot water storage type hot water supply apparatus according to claim 3, wherein it is determined whether or not the temperature of the water in the hot water storage tank (1) detected by the temperature detection means (Rth2) is equal to or higher than the set temperature. The heater control means (3c) includes a temperature discrimination means (3b), and the heater control means (3c) is provided in the hot water storage tank (1) in which the temperature discrimination means (3b) is detected by the temperature detection means (Rth1, Rth2, Rth3). A hot water storage type hot water supply device characterized in that the heater (2) is turned off when it is determined that the temperature of water is equal to or higher than the set temperature.