Hot water storage type water heater

Abstract

To provide a hot water storage type water heater which can secure a reboiling capacity by an inexpensive constitution even if a hot water storage calorie in a hot water storage tank 2 is lowered.SOLUTION: A diffusion nozzle 44 for diffusing flow-in hot water in a radial direction of an upper face mirror part 2a, and making it flow into a hot water storage tank 2 is provided at a tip of a heating return pipe 13, and a lower end of the diffusion nozzle 44 is arranged so as to be located at a height of the vicinity of an upper end of a bath heat exchanger 36. When a reboiling calorie cannot be secured during a reboiling operation due to the arrangement of the lower end in the upper face mirror part 2a, the bath heat exchanger 36 can efficiently transmit the heated hot water to the bath heat exchanger 36 by performing a boilup operation, and can secure the reboiling capacity.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a storage type hot water supply device having a heating means. [Background technology]

[0002] Conventionally, this type of storage type hot water supply device has been equipped with a hot water storage tank and a heating means, and a heating circulation circuit is formed by connecting the hot water storage tank and the heating means with a heating forward pipe that sends water from the bottom of the storage tank to the heating means and a heating return pipe that sends water from the heating means to the hot water storage tank.A hot water storage type hot water supply device has been known that performs a re-heating operation in which the hot water stored at the top of the hot water storage tank and the bathtub water are heated via a bath heat exchanger by circulating hot water in the hot water storage tank and the heating means with a circulation pump provided in the heating circulation circuit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-140441 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a system such as that described in Patent Document 1 in which the high-temperature water at the top of the hot water storage tank is heat exchanged between the high-temperature water in the bathtub and the water in the bathtub via a bath heat exchanger, if the amount of high-temperature water at the top of the hot water storage tank becomes low during the re-heating operation, the re-heating capacity cannot be secured, and it takes a long time from the start to the end of the re-heating operation. [Means for solving the problem]

[0005] According to the present invention, a hot water storage tank, which is composed of an upper mirror portion, a lower mirror portion, and a cylindrical portion, for storing hot water, heating means capable of performing a boiling operation for heating the hot water in the hot water storage tank, a heating supply pipe for sending hot water from a lower portion of the hot water storage tank to the heating means, a heating return pipe connected to an upper portion of the hot water storage tank and sending the hot water heated by the heating means to the upper portion of the hot water storage tank, a bath heat exchanger configured in a spiral shape and capable of performing a reheating operation of the bath water by exchanging heat between the hot water in the hot water storage tank and the bath water, and In a storage-type hot water supply device equipped with a bath circulation circuit that connects the bath heat exchanger and the bathtub in a circulatory manner, the tip of the heating return pipe is equipped with a diffusion nozzle that diffuses the incoming hot water in the radial direction of the upper mirror portion and flows it out into the hot water storage tank, the lower end of the diffusion nozzle is positioned so that it is at the same height as the upper end of the bath heat exchanger, and the bath heat exchanger is positioned within the upper mirror portion.

[0006] In addition, a hot water temperature sensor for detecting the temperature inside the hot water tank is provided on the wall of the hot water tank at a height near the lower end of the bath heat exchanger.

[0007] In addition, a control device is provided that controls the re-heating operation and the water heating operation, and when the detection value of the hot water storage temperature sensor falls below a predetermined temperature during the re-heating operation, the control device performs the water heating operation and the re-heating operation simultaneously. Effect of the Invention

[0008] According to this invention, the lower end of the diffusion nozzle is positioned at a height near the upper end of the bath heat exchanger, and the bath heat exchanger is positioned within the upper mirror portion, thereby improving the re-heating operation capacity, and even if the amount of heat stored in the hot water tank decreases, the time from when the re-heating operation starts to when it ends can be shortened. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic configuration diagram showing an embodiment of the present invention. [Diagram 2] 4 is a flowchart showing the operation of the reheating operation of the present invention. [Diagram 3] FIG. 2 is a perspective view of a diffusion nozzle according to an embodiment of the present invention. [Figure 4] 1 is a schematic cross-sectional view showing a hot water tank according to an embodiment of the present invention. [Diagram 5] FIG. 4 is a diagram showing the flow of hot water during boiling operation in an embodiment of the present invention. [Figure 6] 13 is a diagram showing the flow of hot water during heating operation when the amount of hot water stored falls below the minimum amount of heat in an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Next, a storage type hot water supply device according to one embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes the hot water storage tank unit, inside which are provided a hot water storage tank 2 for storing hot water, a bathtub 3, a hot water outlet pipe 4 connected to the top of the hot water storage tank 2, a water supply pipe 5 connected to the bottom of the hot water storage tank 2, a hot water mixing valve 7 for mixing high temperature water from the hot water outlet pipe 4 with low temperature water from a water supply bypass pipe 6 branching off from the water supply pipe 5, and a hot water temperature sensor 9 and a hot water flow sensor 10 for detecting the hot water flow rate, both of which are provided in a hot water pipe 8 connected downstream of the hot water mixing valve 7.

[0011] The hot water tank 2 is composed of an upper mirror portion 2a, a cylindrical portion 2b, and a lower mirror portion 2c.

[0012] Reference numeral 11 denotes heating means for heating hot water, 12 denotes a heating supply pipe for sending hot water from the bottom of the hot water storage tank 2 to the heating means 11, 13 denotes a heating return pipe for returning heated hot water from the heating means 11 to the top of the hot water storage tank 2, 14 denotes a heating circulation circuit composed of the heating supply pipe 12 and the heating return pipe 13 for allowing circulation between the hot water storage tank 2 and the heating means 11, and 15 denotes a heat pump control unit for controlling the heating means 11. Carbon dioxide is used as a refrigerant in the heating means 11 to constitute a supercritical heat pump cycle. In addition, because carbon dioxide is used as the refrigerant, it is possible to boil low-temperature water to a high temperature of about 90°C without an electric heater.

[0013] In addition, a heating bypass valve 16 is provided in the middle of the heating return pipe 13, and when the hot water cannot be heated sufficiently in the early stages of boiling, the heating bypass valve 16 is switched to communicate with the heating bypass pipe 17 side, which is a heating bypass route connected to the water supply pipe 5 at the bottom of the hot water storage tank 2, thereby preventing freezing by circulating a short circuit using the lower part of the hot water storage tank 2. This heating bypass valve 16 is located at the branch point from the heating return pipe 13 to the heating bypass pipe 17.

[0014] In addition, when circulating hot water that is not sufficiently heated at the beginning of heating by the heating means 11, the hot water is not returned to the top of the hot water storage tank 2, but is returned to the bottom of the hot water storage tank 2 via a bypass circulation path via the heating bypass pipe 17, and when circulating hot water that is sufficiently heated thereafter, the heating bypass valve 16 is switched to the top side of the hot water storage tank 2.

[0015] Reference numeral 18 denotes a control device consisting of a microcomputer etc., which controls the heat pump control unit 15 to perform operations such as heating and reheating the hot water storage tank 2 using the heating circulation circuit 14, controlling the hot water temperature, filling the bathtub with water, reheating the bathtub, and keeping the bathtub warm.

[0016] The control device 18 also has a heating bypass valve control means 19 that controls the opening degree of the heating bypass valve 16. Specifically, the heating bypass valve control means 19 switches between a first state in which the heating bypass valve 16 is switched to the heating bypass pipe 17 side and communicates with the water supply pipe 5 at the bottom of the hot water storage tank 2, and a second state in which the heating bypass valve 16 is communicated with the upper side of the hot water storage tank 2.

[0017] The remote control 20 further has a temperature setting switch 21 for setting the hot water supply temperature setting, a reheating switch 22 for instructing reheating of the bath, and a hot water volume setting switch 23 for setting the amount of hot water to be filled, and is further equipped with a display unit 24 consisting of a dot matrix type fluorescent display tube, and a remote control control unit 25 consisting of a microcomputer which controls the display unit 24 and communicates with the control device 18.

[0018] Further, the water-refrigerant heat exchanger of the heating circulation circuit 14 is provided on its water inlet side with an inlet water temperature sensor 26 for detecting the inlet water temperature, and on its outlet side with an outlet temperature sensor 27 for detecting the temperature of the hot water after heating, and a plurality of hot water temperature sensors 28 for detecting the temperature of hot water stored in the hot water storage tank 2 provided in the hot water storage tank 2, the lower hot water temperature sensor 28 continuously detecting the target temperature for boiling, thereby terminating the boiling operation. Further, in the embodiment, the boiling operation is terminated when the hot water temperature sensor 28 continuously detects the target temperature for boiling, but the amount of hot water stored may be calculated from the temperature of hot water detected by the hot water temperature sensor 28, and the boiling operation may be terminated when the target amount of hot water stored is reached during the boiling operation.

[0019] The hot water temperature sensor 28 is a temperature sensor provided outside the hot water tank 2, and the control device 18 calculates the amount of stored hot water heat remaining in the hot water tank 2 according to the stored hot water temperature detected by the hot water temperature sensor 28. The hot water temperature sensors 28 are provided at predetermined intervals from near the upper end to near the lower end of the cylindrical portion 2b of the hot water tank 2, and are numbered from the top as sensors 28a to 28f.

[0020] 29 is a pressure reducing valve provided in the water supply pipe 5.

[0021] Reference numeral 30 denotes a pressure relief valve provided in the heating bypass pipe 17 for relieving pressure in the hot water storage tank 2 and the heating circulation circuit 14. The temperature of the hot water in the hot water storage tank 2 and the heating circulation circuit 14 rises due to the heating operation, and the pressure in the storage type hot water supply system rises. When the pressure exceeds a predetermined pressure, the valve opens and the hot water and pressure are discharged outside the storage type hot water supply system.

[0022] In addition, 31 is a hot water filling pipe that branches off from the hot water supply pipe 8 and is connected to the bath circulation circuit 35 for filling the bathtub 3 with hot water, 31 is a hot water filling valve that connects the hot water filling pipe 32 to the bathtub 3 and supplies hot water to the bathtub 3, 33 is a hot water filling temperature sensor that detects the bath temperature supplied to the bath, and 34 is a bath flow rate sensor that detects the flow rate passing through the hot water filling pipe 32.

[0023] Reference numeral 35 denotes a bath circulation circuit, which connects a bath heat exchanger 36 consisting of a helical serpentine pipe installed in the hot water storage tank 2 to the bathtub 3 via a bath supply pipe 37a and a bath return pipe 37b to enable circulation. Reference numeral 38 denotes a bath circulation pump installed in the bath circulation circuit 35, 39 denotes a flowing water sensor that detects the presence or absence of running water, 40 denotes a bath temperature sensor that detects the temperature of the bathtub water flowing through the bath circulation circuit 35, and 41 denotes a water level sensor that detects the water level in the bathtub 3 from the water pressure of the bathtub water.

[0024] Here, the water level sensor 41 is installed in the bath circulation circuit 35, and in order to detect the water pressure of the bathtub water, the water level must be above the circulation port of the bathtub 3 (not shown) in order for the bathtub water to be circulated within the bath circulation circuit. Therefore, if the water level is below the circulation port, it is determined that there is no water in the bathtub 3 even if there is bathtub water, and if the water level is above the circulation port, it is determined that there is water in the bathtub 3.

[0025] Reference numeral 42 denotes a bath bypass pipe that bypasses the bath heat exchanger 36 and connects the bath supply pipe 37a and the bath return pipe 37b. A flow path switching means 43 consisting of a three-way valve is provided at the connection between the bath bypass pipe 42 and the bath return pipe 37b, and selectively switches whether or not the hot water flowing through the bath circulation circuit 35 is flowed to the bath heat exchanger 36.

[0026] Next, the boiling operation will be described. When there is a decrease in the amount of heat stored in the hot water or a request for heating during the night, the heating bypass valve control means 19 switches the heating bypass valve 16 to a first state in which it communicates with the lower side of the hot water storage tank 2, and the control device 18 drives a circulation pump located in the middle of the piping connecting the hot water storage tank 2 and the heating means 11 to draw up water from the lower part of the hot water storage tank 2, heat it with the heating means 11, and return it to the lower part of the hot water storage tank 32, and then when the end condition of the low rotation state is reached, it switches to a second state in which it communicates with the upper side of the hot water storage tank 2, and by continuing the operation of returning the water to the upper part of the hot water storage tank 2, the water in the hot water storage tank 2 is gradually boiled up into high-temperature water. Also, hot water is stored in layers from the top of the hot water storage tank 2, and a temperature stratification is formed in the hot water storage tank 2 with a high-temperature layer in the upper part and a low-temperature layer in the lower part, and a boiling operation is performed.

[0027] A decrease in the stored hot water heat quantity refers to when it falls below a preset minimum stored hot water heat quantity or minimum stored hot water temperature.For example, when the detection value detected by sensor 28a, which is located at the highest position of the stored hot water temperature sensors 28 arranged near the lower end of bath heat exchanger 36, falls below a predetermined temperature (here, 50°C), a heating operation is started to ensure the minimum stored hot water heat quantity.

[0028] Next, the hot water supply operation will be described. When the hot water tap is opened, water is supplied from water supply pipe 5, flows into the bottom of hot water storage tank 2 and passes through water supply bypass pipe 6. The high-temperature water pushed out from the top of hot water storage tank 2 and the water supply from water supply bypass pipe 6 are mixed in hot water mixing valve 7, and hot water adjusted so that the hot water setting temperature and the temperature detected by hot water temperature sensor 9 are the same is supplied from the hot water tap.

[0029] The filling operation will also be described. When the filling switch 30 on the remote control 20 is pressed, the control device 18 opens the filling valve 31, supplies water from the water supply pipe 5, and the water flows into the bottom of the hot water storage tank 2 and passes through the water supply bypass pipe 6. The high-temperature water pushed out from the top of the hot water storage tank 2 and the water supply from the water supply bypass pipe 6 are mixed in the hot water supply mixing valve 7, and the hot water adjusted so that the bath set temperature and the temperature detected by the bath temperature sensor 40 are the same is flowed into the bathtub 3, starting filling the bath. The bath flow rate sensor 34 then detects the flow rate, and when the total accumulated value of the flowing flow reaches the set filling amount, the control device 18 closes the filling valve 31, completing filling the bath.

[0030] Next, the reheating operation will be described. When the reheating switch 22 on the remote control 20 is pressed, or when the bath temperature falls below a predetermined range during warming operation to keep the bath temperature within the predetermined range, the control device 18 drives the bath circulation pump 38 and drives the flow path switching means 43 to the communication side of the bath heat exchanger 36. As a result, the bath water in the bathtub 3 exchanges heat with the high-temperature water in the hot water storage tank 2 via the bath heat exchanger 36, and the heated bath water returns to the bathtub 3, raising its temperature. By repeating this circulation, the bath water can be reheated to the bath set temperature.

[0031] In addition, this reheating operation heats the bathtub water by exchanging heat with the high-temperature water stored near the bath heat exchanger 36 of the hot water storage tank 2. Therefore, if the reheating operation is performed frequently, the temperature of the hot water stored at the top of the hot water storage tank 2 will decrease, and the reheating capacity will decrease.

[0032] Next, the operation of the embodiment in the case where the re-heating operation and the boiling operation are simultaneously performed when the amount of heat of hot water stored falls below the minimum amount during the re-heating operation will be described in detail with reference to the flowchart of FIG. When the control device 18 requests reheating operation due to automatic warming or when the user operates the reheating switch 22 (S1 is Yes), the control device 18 performs the reheating operation (S2). At this time, the control device 18 starts the reheating operation, drives the bath circulation pump 38, and sets the flow path switching means 43 to a connected state with the bath heat exchanger 36 side to circulate the bath water.

[0033] During the reheating operation, the control device 18 monitors whether the temperature detected by the bath temperature sensor 40 has reached the bath set temperature (S3).

[0034] If the temperature detected by the bath temperature sensor 40 reaches the bath set temperature in S3 (No in S3), the reheating operation is ended (S4).

[0035] Furthermore, if the temperature detected by the bath temperature sensor 40 does not reach the bath set temperature in S3 (S3 is Yes) and the temperature detected by the hot water temperature sensor 28 drops due to heat exchange during the reheating operation and falls below the predetermined minimum amount of heat stored in the hot water (S5 is Yes), a boiling operation is performed (S6).

[0036] Then, when the temperature detected by the bath temperature sensor 40 reaches the bath set temperature due to the simultaneous operation of the reheating operation and the water heating operation (No in S7), the reheating operation is ended (S8).

[0037] Moreover, when it is detected that the temperature detected by the hot water temperature sensor 28 has reached or exceeded the minimum hot water temperature (Yes in S9), the heating operation is ended (S10).

[0038] Next, the positional relationship between the bath heat exchanger 36, the heating return pipe 13, and the hot water temperature sensor 28 will be described with reference to FIGS. First, a diffusion nozzle 44 as shown in FIG. The diffusion nozzle 44 is a hollow cylindrical body with one end closed and the other end open, and has multiple outlet holes 45 opened on the side surface thereof, and diffuses hot water flowing in from the other end from the multiple outlet holes 45 in the radial direction of the upper mirror portion 2a of the hot water storage tank 2 so that it flows out into the hot water storage tank 2.

[0039] Next, the relative positions of each will be explained. The position of the outflow hole 45 of the diffusion nozzle 44 is the first reference line A, the position of the upper end of the bath heat exchanger 36 is the second reference line B, the position of the lower end of the bath heat exchanger 36 is the third reference line C, and the position of the sensor 28a, which is located at the highest position among the hot water temperature sensors 28, is the fourth reference line D.

[0040] Since the outlet hole 45 of the diffusion nozzle 44 is disposed at a position higher than the upper end of the bath heat exchanger 36 made of a coiled tube, the first reference line A is at a position higher than the second reference line B.

[0041] In this way, since the first reference line A of the outlet hole 45 of the diffusion nozzle 44 is higher than the second reference line B of the upper end of the bath heat exchanger 36, the hot water diffused from the outlet hole 45 can be diffused onto the upper mirror portion 2a without being blocked by the bath heat exchanger 36.

[0042] In addition, the bath heat exchanger 36, which is made of a coiled pipe, is disposed inside the upper mirror portion 2a.

[0043] In addition, the highest sensor 28a of the hot water temperature sensor 28, which determines the heating operation when the hot water heat amount falls below the minimum, is positioned lower than the lower end of the bath heat exchanger 36, so the fourth reference line D is positioned lower than the third reference line C.

[0044] In this way, by setting the fourth reference line D of sensor 28a lower than the third reference line C at the lower end of the bath heat exchanger 36, it is possible to detect that the amount of heat has decreased near the bath heat exchanger 36 and that the re-heating capacity cannot be secured during re-heating operation.

[0045] Also, explaining the flow of hot and cold water based on Figure 5, since the outlet hole 45 of the diffusion nozzle 44 is positioned higher than the upper end of the bath heat exchanger 36, the hot and cold water flowing out from the outlet hole 45 diffuses in the radial direction of the upper mirror portion 2a and flows downward along the inner surface of the upper mirror portion 2a.

[0046] Subsequently, as the flow rate of the hot water decreases or as the hot water comes into contact with the boundary surface of the temperature stratification of the hot water storage tank 2, the flow of the hot water that was descending along the inner surface of the hot water storage tank 2 flows toward the center of the hot water storage tank 2, and the hot water that was spreading radially collides with the center of the hot water storage tank 2 and rises, and then repeatedly convects so as to descend again along the inner surface of the upper mirror portion 2a.

[0047] In addition, if the reheating operation causes the stored hot water temperature sensor 28 to fall below the minimum stored hot water heat amount, the flow of hot water when the boiling operation is started while the reheating operation is being performed, as shown in the flowchart of Figure 2, is explained based on Figure 6.

[0048] When the temperature of the hot water temperature sensor 28 drops due to the heat exchange during the reheating operation and falls below the predetermined minimum amount of heat stored in the hot water, the boiling operation is performed. At this time, the temperature has dropped to the position of the sensor 28a, so the temperature stratification is at the position of the sensor 28a.

[0049] When the boiling operation is performed, the heated hot water flows out from the outlet hole 45 of the diffusion nozzle 44. Because the outlet hole 45 of the diffusion nozzle 44 is located at a position higher than the upper end of the bath heat exchanger 36, the hot water flowing out from the outlet hole 45 diffuses in the radial direction of the upper mirror portion 2a and flows down along the inner surface of the upper mirror portion 2a.

[0050] Because the temperature has dropped to the position of sensor 28a, the temperature stratification inside the hot water storage tank 2 is at the position of sensor 28a, so the flow of hot water flows toward the center of the hot water storage tank 2 along the boundary surface of the temperature stratification, and the hot water that has been diffused radially collides at the center of the hot water storage tank 2 and rises, and then convects repeatedly, descending again along the inner surface of the upper mirror portion 2a.

[0051] In this way, since the sensor 28a is located near the lower end of the bath heat exchanger 36, the heated hot water flows toward the center due to temperature stratification near the lower end of the bath heat exchanger 36, rises from the center of the bath heat exchanger 36 which is made of a coiled tube, and convects to envelop the bath heat exchanger 36. Therefore, during re-heating operation, high-temperature hot water boiled by the heating means 11 can be transmitted to the bath heat exchanger 36, and the re-heating capacity required for re-heating operation can be secured even if the amount of stored hot water decreases and the stored hot water temperature drops.

[0052] In addition, since the hot water boiled to a high temperature by the heating means 11 during reheating operation is stored while wrapping the bath heat exchanger 36, the heating capacity of the reheating operation can be improved and the time required to complete the reheating operation can be shortened.

[0053] In addition, when the boiling operation is performed alone, the hot water diffuses radially from the outlet hole 45 of the diffusion nozzle 44 and flows downward along the inner surface of the upper mirror portion 2a, so that the flow rate of the hot water decreases rapidly, thereby preventing the temperature stratification from being disturbed.

[0054] The present invention is not limited to the embodiments, and does not prevent modifications within the scope of the present invention as long as the gist is not changed. For example, in the embodiment, the standard for the minimum stored hot water heat quantity is set to sensor 28a, which is located at the highest position, but the standard for the minimum stored hot water heat quantity may also be sensor 28b, and sensor 28b may be located near the lower end of bath heat exchanger 36, and a sensor for detecting the stored hot water temperature may be located in a position where a decrease in the heat quantity of bath heat exchanger 36 can be detected.

[0055] Furthermore, it is not necessary for the entire bath heat exchanger 36 to be contained within the upper mirror portion 2a. Even if only a portion of the bath heat exchanger 36 is contained within the cylindrical portion 2b in order to attach the hot water temperature sensor 28 to the hot water tank 2, the relationship between the third reference line C and the fourth reference line D will be satisfied. [Explanation of symbols]

[0056] 1 Hot water tank unit 2 Hot water tank 2a Top mirror section 2b Cylindrical part 2c Bottom mirror section 3. Bathtub 11 Heating means 12 Heating supply pipe 13 Heat return pipe 18 Control device 28 Hot water temperature sensor 36 Bath Heat Exchanger 40 Bath temperature sensor 44 Diffusion Nozzle 45 Outflow hole

Claims

1. A hot water storage tank that is composed of an upper mirror portion, a lower mirror portion, and a cylindrical portion and stores hot water; A heating means capable of performing a boiling operation for heating the hot water in the hot water storage tank; A heating pipe that sends water from a lower portion of the hot water storage tank to the heating means; A heating return pipe connected to an upper portion of the hot water storage tank and sending the hot water heated by the heating means to the upper portion of the hot water storage tank; A bath heat exchanger that is spirally configured and exchanges heat between the hot water in the hot water storage tank and bath water, thereby enabling a reheating operation of the bath water; A hot water storage type hot water supply device including a bath circulation circuit that is composed of a bath supply pipe from a bathtub to the bath heat exchanger and a bath return pipe from the bath heat exchanger to the bathtub, and that connects the bath heat exchanger and the bathtub in a circulatory manner, A diffusion nozzle is provided at the tip of the heat return pipe to diffuse the hot water that flows in in the radial direction of the upper mirror portion and flow out into the hot water storage tank, The lower end of the diffusion nozzle is disposed at a height near the upper end of the bath heat exchanger, A storage type hot water supply device characterized in that the bath heat exchanger is arranged within the upper mirror portion.

2. 2. The storage type hot water supply device according to claim 1, further comprising a hot water temperature sensor for detecting a temperature inside the hot water storage tank, the hot water temperature sensor being provided on a wall surface of the hot water storage tank at a height near the lower end of the bath heat exchanger.

3. A control device is provided to control the reheating operation and the boiling operation, The hot water storage type hot water supply device according to claim 2, characterized in that the control device is configured to simultaneously perform the boiling operation and the reheating operation when the detection value of the hot water storage temperature sensor falls below a predetermined temperature during the reheating operation.

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