JP2004144473A - Heat pump type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide stable hot water temperature even when operation based on a hot water supply load and economy is selected, achieve compactness of a hot water storage tank, and save energy. <P>SOLUTION: This device is provided with a water circulation passage connected to a water heat exchanger 13 to circulate hot water from a lower part of the hot water storage tank 5 upward for heat exchanging with a condenser 2 of a cooling medium circulation circuit, and a mixing valve 17 to mix hot water taken from an upper part of the hot water storage tank 5 and city water to provide desired hot water temperature. The water circulation passage downstream of the water heat exchanger is connected to a heater 23, and in a case where the hot water supply load is quickly increased, the heater is operated together with the cooling medium circulation circuit. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a heat pump water heater.

A first conventional example of a conventional heat pump water heater is shown in FIG. 13, that is, a refrigerant circuit including a compressor 1, a condenser 2, a pressure reducing device 3, and an evaporator 4, a hot water tank 5, a circulation pump 6 A hot water supply circuit to which a heat exchange section for exchanging heat with the condenser 2 is connected; a heater 7 provided at an upper portion in the hot water storage tank 1; and an upper portion and a central portion of the hot water storage tank 5. A hot water control device 8 and an electric opening / closing valve 9 are used. The whole inside of the hot water storage tank 5 is heated to low-temperature hot water by the heat pump operation by the compressor 1, and the upper part of the hot water storage tank 5 is heated by the heater 7 at midnight. Heat to hot water.

Normally, the electric on-off valve 9 is closed and the low-temperature hot water is used from the center of the hot water storage tank 5 via the hot water control device 8, and when high-temperature hot water is required, the electric on-off valve 9 is opened to open the high-temperature hot water. Is used via the hot and cold water control device 8 (for example, see Patent Document 1).

FIG. 14 shows a second conventional example using a general electric water heater. A hot water controller 8 is provided at the outlet of the hot water tank 5 and a heater 10 built in the hot water tank 5 is used. The hot water and the water supplied from the pressure reducing valve 11 are mixed at an appropriate temperature by the hot water controller 8 and then poured into a bathtub (for example, see Patent Document 2).
JP-A 1-225838 JP-A-4-6345

However, in the first conventional example, when hot water is discharged, the hot water remains in the pipe to the terminal (faucet) after the hot water is stopped, and the hot water is radiated from the pipe as time passes to lower the temperature.

That is, heat radiation loss occurs, so it is necessary to increase the heat radiation amount. In addition, when the terminal mixes high-temperature hot water and city water to obtain an appropriate temperature, it takes time to adjust the temperature and wastes the high-temperature water.

Therefore, as the capacity of the hot water tank increases, the energy required for boiling increases. Therefore, there were problems in terms of installation space, energy saving, and convenience when tapping.

Further, in the second conventional example, since the water in the entire hot water storage tank 5 is heated to uniform hot water by the heater 10, and the hot water is stored, heat radiation from the hot water storage tank 5 becomes large with respect to a small amount of hot water supply load, resulting in wasteful energy consumption. It becomes.

The present invention solves such a conventional problem, and aims to reduce the size of a hot water tank and save energy.

In order to achieve the above object, the present invention provides a refrigerant circulation circuit having a compressor, a water heat exchanger arranged for circulation of hot and cold water in a hot water storage tank, and performing heat exchange with the refrigerant circulation circuit on the way. A connected water circulation path, a heater located downstream of the water heat exchanger and connected to the water circulation path, and forcibly circulating hot water from the lower part of the hot water tank to the upper part of the water circulation path in the water circulation path, the water heat exchanger A circulating pump for storing the hot and cold water heated at a temperature above the hot water storage tank in a stratified manner, a mixing valve for mixing hot water taken out from the upper part of the hot water storage tank and tap water to perform optional hot water temperature adjustment, It comprises a heating operation means, and an operation controller for performing a combined operation of a heater and a compressor of the refrigerant circuit in accordance with a command from the reheating operation means.

Therefore, high-temperature hot water from a heat pump can be stored in the upper portion of the hot water storage tank according to the hot water supply load due to the season and the like, and the hot water lowered to an appropriate temperature can be taken out through the mixing valve.

If a large amount of hot water is needed urgently, a command is issued manually from the reheating operation means to operate the compressor in the refrigerant circuit together with the heater.

As is clear from the above description, according to the heat pump water heater of the present invention, a stable hot water temperature can be obtained even when the operation in pursuit of the hot water supply load and economy is selected regardless of the remaining hot water temperature, and even the terminal equipment can be obtained. The heat loss of the piping system is reduced, so that the hot water storage tank is reduced in size and energy is saved.

Moreover, the present invention can appropriately cope with a sudden increase in hot water supply load, and can provide a heat pump water heater suitable for actual use.

An embodiment of the present invention is directed to a water circulation circuit having a refrigerant circulation circuit having a compressor and a water heat exchanger arranged for hot water circulation of a hot water storage tank and performing heat exchange with the refrigerant circulation circuit on the way. And a heater located downstream of the water heat exchanger and connected to the water circulation path, forcibly circulating hot water from the lower part to the upper part of the hot water tank in the water circulation path, and heated by the water heat exchanger. A circulating pump for storing hot water in a temperature stratified manner from above the hot water storage tank, a mixing valve for mixing hot water taken out from the upper part of the hot water storage tank and tap water to perform optional hot water temperature control, and a reheating operation means; And an operation controller for operating the heater together with the compressor of the refrigerant circuit in accordance with a command from the reheating operation means.

Therefore, high-temperature hot water from a heat pump can be stored in the upper part of the hot water storage tank according to the hot water supply load depending on the season or the like, and the hot water lowered to an appropriate temperature can be taken out through the mixing valve.

If a large amount of hot water is needed urgently, for example, a command is issued manually from the reheating operation means so that the heater operates together with the compressor in the refrigerant circuit.

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

(Example 1)
In FIG. 1, reference numeral 1 denotes a compressor, 2 denotes a condenser, 3 denotes a decompression device, and 4 denotes an evaporator. The compressor 1, the condenser 2, the decompression device 3, and the evaporator 4 are connected in order, and a refrigerant circulation circuit is provided. Is composed.

# 5 is a hot water tank, 12 is a circulation pump for forcibly circulating the hot water under the hot water tank 5 to the upper part, and 13 is a water heat exchanger, which exchanges heat with the condenser 2.

The circulation pump 12 and the water heat exchanger 13 constitute a water circulation path communicating the lower part and the upper part of the hot water storage tank 5. Reference numeral 14 denotes a temperature detector, which is provided at the outlet of the water heat exchanger 13 and detects a medium temperature to generate a signal. Reference numeral 15 denotes hot water temperature setting means for setting the boiling hot water temperature and having a plurality of signals.

# 16 is a rotation speed controller which controls the rotation speed of the circulation pump 12 so that the signal of the temperature detector 14 matches the signal of the hot water temperature setting means 15. A mixing valve 17 mixes hot water taken out from the upper part of the hot water storage tank 5 with water depressurized by the pressure reducing valve 11 and supplied to the lower part of the hot water storage tank 5 to arbitrarily adjust the hot water temperature.

Next, the operation of the above configuration will be described. When the hot water supply load is large, the hot water temperature setting means 15 sets the boiling of the high-temperature hot water, and when the hot water supply load is small, the medium hot water is set for the boiling. Then, the high-temperature and high-pressure superheated gas discharged from the compressor 1 flows into the condenser 2, where it heats the water sent from the circulation pump 12 and flowing into the water heat exchanger 13. At that time, it is condensed and liquefied by the heat radiation action and flows into the pressure reducing device 3, where the pressure is reduced and flows into the evaporator 4.

吸 Then, the heat of the atmosphere is absorbed to evaporate and return to the compressor 1. On the other hand, the water flowing out from the lower part of the hot water tank 5 flows into the water heat exchanger 13 via the circulation pump 12, is heated by the heat of condensation of the refrigerant, and is stored in the upper part of the hot water tank 5. By repeating this operation, the whole hot water is gradually stored from above in the hot water storage tank 5.

In this case, if the high-temperature hot water boiling operation is performed to a place where the remaining hot water of the previous day has been heated by the heat pump, the high-temperature hot water is stored above the remaining hot water of the previous day. That is, hot water layers having different temperatures are stored in the hot water storage tank 5. In other words, a temperature stratified type hot water is stored.

When the hot water is to be discharged from the hot water storage tank 5, the mixing valve 17 mixes the high-temperature hot water in the upper part of the hot water storage tank 5 with the tap water, lowers the hot water temperature used in the terminal and sends it to the terminal equipment. Is stable.

Therefore, even if the remaining hot water temperature and the boiling temperature are different, it is possible to select an operation pursuing a hot water supply load and economy. In addition, since heat loss in the piping system to the terminal device is reduced, the size of the hot water storage tank is reduced and energy saving is achieved. Further, it is not necessary to adjust the hot water temperature at the terminal, and the convenience is improved.

(Example 2)
In FIG. 2, components having the same configuration and operation as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 18 denotes hot water amount detecting means, which is provided in the hot water storage tank 5 and detects a temperature of hot water in the hot water storage tank to generate a signal. Reference numeral 19 denotes a controller which sets the temperature of the hot water temperature setting means 15 based on the signal of the hot water amount detecting means 18.

動作 The operation of the above configuration will be described. Immediately before the start of the boiling operation, the controller 19 sets the set temperature of the hot water setting means 15 from the detection signals of the remaining hot water amounts of the plurality of hot water detecting means 18 provided in the hot water tank 5.

That is, when the remaining hot water amount is larger than the previous day, the temperature setting of the hot water temperature setting means 15 is lowered. Conversely, when the amount of remaining hot water is small, the temperature setting is increased. The control of the set temperature of the hot water temperature setting means 15 by the controller 19 is performed by changing the temperature set by the initial hot water temperature setting means 15 (for example, changing the temperature setting of 65 ° C. to 50 ° C.). Alternatively, the setting temperature of the hot water setting means 15 may be automatically determined based on the hot water amount detected by the hot water amount detecting means 18.

Then, the boiling operation is started, and the rotation speed controller 16 controls the rotation speed of the circulating pump 12 to boil to the set temperature so that the signal of the temperature detector 14 matches the signal of the hot water temperature setting means 15. Thereafter, the temperature is lowered to an appropriate temperature by the mixing valve 17 and sent to the terminal device.

Therefore, even if the remaining hot water temperature and the boiling temperature are different, the hot water temperature at the terminal is stable, so that the hot water temperature can be automatically set according to the amount of hot water used.

(Example 3)
In FIG. 3, components having the same configuration and operation as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

# 20 is a plurality of mixing valves, each of which mixes hot water taken out of the hot water storage tank 5 and water supplied to the lower part of the hot water storage tank 5 to arbitrarily adjust the hot water temperature.

動作 The operation of the above configuration will be described. When the hot water heated in the hot water storage tank 5 is discharged at the same time under different conditions such as a kitchen and a bath reheating, a plurality of mixing valves 20 are provided according to a request from a terminal. Adjust to hot water temperature and supply.

Therefore, even if tapping and stopping at different hot water temperatures are performed at each terminal, the tapping temperature is stabilized, and convenience is improved.

(Example 4)
In FIG. 4, components having the same configurations and operations as those of the first to third embodiments are denoted by the same reference numerals, and description thereof is omitted.

# 21 denotes hot water temperature setting means for setting the hot water temperature of the terminal. Reference numeral 22 denotes a controller, which sends a signal to the mixing valve 17 to match the signal of the hot water temperature setting means 21 gradually from the hot water signal from the hot water temperature setting means 21 at the time of hot water supply.

動作 The operation of the above configuration will be described. Hot water temperature setting means 21 sets the hot water temperature of the terminal. Immediately after the tapping, the controller 22 sends a signal of the hot water slightly higher than the signal of the tapping temperature setting means 21 to the mixing valve 17, and then sends a signal that matches the signal of the tapping temperature setting means 21. Therefore, the temperature of hot water to be discharged from the terminal is quickly increased.

(Example 5)
In FIG. 5, components having the same configuration and operation as those of the first to fourth embodiments are denoted by the same reference numerals, and description thereof is omitted.

# 23 is a heater provided downstream of the water heat exchanger 13. Reference numeral 24 denotes hot water amount detecting means, which is provided in the hot water storage tank 5 in plurality. Reference numeral 25 denotes a heating controller, which energizes the heater 23 in response to a signal from the hot water amount detecting means 24.

# 26 is a time integrating means, which receives the signal from the hot water amount detecting means 24 and integrates the energizing time of the heater 23. 27 is a storage means for storing the previous time integrating means 26. Reference numeral 28 denotes a hot water amount comparing means, which compares the signal of the hot water amount detecting means 24 immediately before and immediately before the start of the operation, and transmits a change amount signal of the hot water amount exceeding a certain temperature. 29 is an operation time control means for setting the energization time of the heater 23 from the storage means 27 and the hot water amount comparison means 28.

動作 The operation of the above configuration will be described. Immediately before the start of the boiling operation, the hot water amount detecting means 24 detects the remaining hot water amount in the hot water storage tank 5 and sends a signal to the hot water amount comparing means 28. Then, the last remaining hot water amount is compared with the current remaining hot water amount, and a signal is transmitted to the operation time control means 29.

{Circle around (2)} The storage unit 27 transmits a signal of the previous energization time of the heater 23 to the operation time control unit 29. Then, the operating time control means 29 sets the energizing time of the heater 23 at the time of the current boiling operation from the signals of the storage means 27 and the hot water amount comparing means 28.

That is, the remaining hot water amount is compared with the previous day and today, and when the remaining hot water amount is large, the energizing time of the heater 23 is set to be short. Conversely, if the amount of remaining hot water is small, the energization time is set longer. Then, the boiling operation is started, and the heated hot water is sequentially stored from the upper part of the hot water storage tank 5 by the heat pump using the compressor 1.

When the hot water is stored up to the position of the hot water amount detecting means 24, the hot water amount detecting means 24 sends a signal to the heating controller 25, and the heater 23 is energized.

(4) The time accumulating means 26 accumulates the energizing time of the heater 23 and is energized until the energizing time set by the operating time control means 29.

The hot water is stored in the hot water tank 5 at different temperature layers. The mixing valve 17 mixes the hot water taken out from the upper part of the hot water tank 5 and the water supplied to the lower part of the hot water tank 5, and the hot water used in the terminal. And send it to the terminal equipment, so that a stable tapping temperature can be obtained.

Also, since the amount of boiling water can be varied according to the amount of hot water used, power consumption can be reduced.

(Example 6)
In FIG. 6, components having the same configuration and operation as those of the first to fifth embodiments are denoted by the same reference numerals, and description thereof is omitted.

# 30 is a reheating operation means for manually setting the reheating operation. An operation controller 31 performs a combined operation of the compressor 1 and the heater 23 in response to a signal from the reheating operation means 30.

動作 The operation of the above configuration will be described. When a large amount of hot water is urgently needed, the operation controller 31 receives a signal from the reheating operation means 30 and energizes the compressor 1 and the heater 23 to perform a combined operation. Therefore, the reheating operation can be performed with a high heating capacity.

Also, even if reheating is performed at a temperature different from the temperature of the remaining hot water in the hot water storage tank 5, the mixing valve 17 is lowered to the hot water temperature used at the terminal and sent to the terminal equipment at the time of tapping. And stabilization of tapping temperature.

(Example 7)
In FIG. 7, components having the same configurations and operations as those of the first to sixth embodiments are denoted by the same reference numerals, and description thereof is omitted.

A mixing valve # 32 mixes the hot water taken out of the hot water storage tank 5 and the water supplied to the lower part of the hot water storage tank 5, adjusts the hot water temperature arbitrarily, and transmits a signal by detecting the temperature.

# 33 is an operation controller which compares the signal of the mixing valve 32 with the signal of the tapping temperature setting means 21 and energizes the compressor 1 and the heater 23.

動作 The operation of the above configuration will be described. When the tapping is started, the mixing valve 32 detects the tapping temperature and sends a signal to the operation controller 33.

The operation controller 33 compares the signal of the mixing valve 32 with the signal of the tapping temperature setting means 21.

(4) When the remaining hot water amount decreases and the hot water temperature starts to decrease, the signal of the mixing valve 32 transmits a signal lower in temperature than the signal of the hot water temperature setting means 21. Recognizing this, the operation controller 33 energizes the compressor 1 and the heater 23 to perform the combined operation.

Therefore, since the reduction of the remaining hot water amount is automatically detected and the reheating operation is automatically performed with a high heating capacity, it is possible to improve convenience and prevent running out of hot water.

(Example 8)
In FIG. 8, components having the same configurations and operations as those of the first to seventh embodiments are denoted by the same reference numerals, and description thereof is omitted.

# 34 is a controller which detects a signal from the mixing valve 32 and switches a signal from the hot water temperature setting means 15 to be equal to a signal from the hot water temperature setting means 21.

In the above configuration, the outlet medium temperature of the water heat exchanger 13 is detected by the temperature detector 14, and the rotation speed controller 16 controls the rotation speed of the circulation pump 12 so that the signal thereof matches the signal of the hot water temperature setting means 15. Perform reheating operation while controlling.

When the tapping is started during the reheating operation, the mixing valve 32 detects the tapping temperature and sends a signal to the controller 34.

Here, the controller 34 compares the signal of the mixing valve 32 with the signal of the tapping temperature setting means 21. Then, when the remaining hot water amount decreases and the hot water temperature starts to drop, controller 34 switches the signal of hot water temperature setting means 15 to match the signal of hot water temperature setting means 21.

Therefore, the rotation speed controller 16 controls the rotation speed of the circulation pump 12 so that the outlet medium temperature of the water heat exchanger 13 matches the signal of the tapping temperature setting means 21. Thereby, the hot water boiled in the water heat exchanger 13 has the same temperature as the hot water to be discharged, and is directly discharged.

(Example 9)
In FIG. 9, components having the same configuration and operation as those of the first to eighth embodiments are denoted by the same reference numerals, and description thereof is omitted.

# 35 is a hot water amount detecting means, which is provided in the hot water storage tank 5 and detects a temperature to transmit a signal. An operation controller 36 energizes the compressor 1 in response to a signal from the hot water amount detecting means 35, and performs an independent operation using a heat pump.

In the above configuration, when the hot water is discharged from the hot water storage tank 5, the hot water level is pushed upward, and when the hot water level reaches the position of the hot water level detecting means 35, the hot water level detecting means 35 sends a signal to the operation controller 36, and the compressor 1 is energized, and an independent operation is performed by a heat pump.

(4) Since the mixing valve 17 is sent to the terminal device after being lowered to the hot water temperature to be used, the tapping temperature is stable even if the remaining hot water temperature and the reheating temperature are different. Therefore, it becomes possible to perform the reheating operation with power saving.

(Example 10)
In FIG. 10, components having the same configuration and operation as those of the first to ninth embodiments are denoted by the same reference numerals, and description thereof is omitted.

# 37 is a heater, which is provided in the middle of the hot water supply circuit above the water heat exchanger 13 and the hot water storage tank 5, and is composed of a plurality of heaters and the like, and the output can be varied. Reference numeral 38 denotes a first temperature detector, which is provided at the outlet of the water heat exchanger 13, detects the temperature of the medium flowing therethrough, and generates a signal.

# 39 is a second temperature detector, which is provided at the outlet of the heater 37, detects the temperature of the medium flowing therethrough, and generates a signal. Reference numeral 40 denotes a rotation speed controller that controls the rotation speed of the circulation pump 12 in response to a signal from the first temperature detector 38. Reference numeral 41 denotes a controller, which controls the output of the heater 37 in response to a signal from the second temperature detector 39.

In the above configuration, the first temperature detector 38 detects the hot water temperature of the heat pump, that is, the hot water temperature of the outlet of the water heat exchanger 13 at the time of the combined operation of the heat pump operation and the heater. The temperature is then sent to 40, where the number of revolutions of the circulation pump 12 is controlled so that the temperature of the hot water from the heat pump becomes a predetermined temperature.

と During the operation, when the outlet temperature of the heater 37 rises, the second temperature detector 39 detects the hot water temperature, sends a signal to the controller 41, and reduces the output of the heater 37. Therefore, the boiling water temperature of the heat pump during the combined operation is the same as that of the heat pump alone operation, so that the boiling operation can be performed with high efficiency.

(Example 11)
11, components having the same configurations and operations as those in the first to tenth embodiments are denoted by the same reference numerals, and description thereof is omitted.

# 42 is an open / close valve, which is provided in the hot water supply circuit of the circulation pump 12 and the water heat exchanger 13. Reference numeral 43 denotes a controller which closes the on-off valve 42 when the operation of the compressor 1 is stopped.

In the above configuration, immediately after the operation is stopped, the hot water between the outlet of the water heat exchanger 13 and the hot water storage tank 5 that has become hot during operation is radiated and the temperature is reduced, and the density is increased. A force is generated, and the hot water tends to flow backward from the upper portion of the hot water storage tank 5.

However, since the controller 43 closes the on-off valve 42 when the operation is stopped, natural circulation can be prevented. As a result, the hot water in the hot water storage tank 5 flows back to the hot water supply circuit and does not radiate heat.

(Example 12)
12, components having the same configuration and operation as those of the first to eleventh embodiments are denoted by the same reference numerals, and description thereof is omitted.

# 44 is a heat source, which is built in the hot water tank 5 or provided in a water circulation path communicating the upper part and the lower part of the hot water tank 5. Reference numeral 45 denotes hot water amount detecting means, which is provided in the hot water storage tank 5 and detects a temperature to generate a signal. Reference numeral 46 denotes a human body recognizing means, which is provided in the bathroom and recognizes the human body and counts the number of persons to generate a signal. Reference numeral 47 denotes an operation controller which controls the operation of the heat source 44 and the circulation pump 12 based on signals from the hot water amount detecting means 45 and the human body recognizing means 46.

In the above configuration, when the remaining hot water reaches the position of the hot water detecting means 45 after the hot water is discharged from the hot water storage tank 5, the hot water detecting means 45 sends a signal to the operation controller 47. The human body recognizing means 46 is provided in the bathroom, counts the number of bathers, and sends a signal to the operation controller 47.

運 転 Then, the operation controller 47 selects whether or not to perform the reheating operation based on the signal of the human body recognizing unit 46 when receiving the signal of the hot water amount detecting unit 45. For example, if the person is the last bather, the remaining amount of hot water at the position of the hot water amount detecting means 45 is sufficient, so that the reheating operation is not performed. Therefore, wasteful reheating operation can be prevented, so that power consumption can be saved, and the operation of boiling the hot water tank can be performed during the late night hours to promote the leveling of the power load.

The last bather is determined by first inputting the number of bathers scheduled.

As described above, according to the present invention, it is possible to provide a heat pump water heater capable of obtaining a stable tap water temperature, and is suitable for, for example, home kitchens and baths.

FIG. 1 is a configuration diagram of a heat pump water heater showing a first embodiment of the present invention. Configuration diagram of a heat pump water heater showing a second embodiment of the present invention Configuration diagram of a heat pump water heater showing a third embodiment of the present invention Configuration diagram of a heat pump water heater showing a fourth embodiment of the present invention Configuration diagram of a heat pump water heater showing a fifth embodiment of the present invention Configuration diagram of a heat pump water heater showing a sixth embodiment of the present invention Configuration diagram of heat pump water heater showing embodiment 7 of the present invention Configuration diagram of a heat pump water heater showing embodiment 8 of the present invention Configuration diagram of a heat pump water heater showing a ninth embodiment of the present invention Configuration diagram of a heat pump water heater showing embodiment 10 of the present invention Configuration diagram of heat pump water heater showing embodiment 11 of the present invention Configuration diagram of a water heater showing a twelfth embodiment of the present invention Configuration diagram of conventional heat pump water heater Configuration diagram of conventional water heater

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Compressor 5 Hot water storage tank 12 Circulation pump 13 Water heat exchanger 17 Mixing valve 21 Hot water temperature setting means

Claims (2)

A refrigerant circuit having a compressor, a water circuit arranged for water circulation of a hot water storage tank, and a water circuit connected to a water heat exchanger for performing heat exchange with the refrigerant circuit in the middle thereof, from the water heat exchanger A heater connected to the water circulation path which is also located on the downstream side, and forcibly circulating hot water from the lower part of the hot water tank to the upper part of the hot water tank in the water circulation path, so that the hot water heated by the water heat exchanger is heated from the upper part of the hot water tank to the temperature. A circulation pump for storing hot water in a stratified manner, a mixing valve for mixing hot water taken out from the upper part of the hot water storage tank and tap water to perform any hot water temperature adjustment, a reheating operation means, and a refueling operation means; A heat pump water heater comprising: an operation controller that performs a combined operation of a heater and a compressor of the refrigerant circuit according to a command. The heat pump water heater according to claim 1, wherein the reheating operation means is manual.

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