JP2014173825A - Hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve maintainability of a water quality adjustment part for suppressing scale deposition.SOLUTION: A hot water supply device includes: a hot water storage tank 3; a water supply pipe 12 in which water to be supplied to a lower part of the hot water storage tank 3 flows; a heating device 10 which heats the water sent from the lower part of the hot water storage tank 3 via a water inflow conduit 18; a hot water tapping conduit 19 in which the water heated in the heating device 10 flows. The water inflow conduit 18 or the water supply pipe 12 has a main flow passage 18a and a sub flow passage 18b which bypasses the main flow passage 18a. The main flow passage 18a has: a water quality adjustment part 23 which is configured attachable to/detachable from the main flow passage 18a and which flows out the water by changing the water quality of the flowing-in water into the water quality in which scale hardly occurs; a first closing valve 25a disposed on the upstream side of the water quality adjustment part 23 and closing a flow passage, and a second closing valve 25b disposed on the downstream side of the water quality adjustment part 23 and closing the flow passage. Thus, maintenance of the water quality adjustment part can be performed without stopping an operation of the hot water supply device.

Description

  The present invention relates to a hot water supply device provided with a water quality adjusting unit.

  Conventionally, as this type of hot water supply device, there is one that stores hot water heated by a heating device in a hot water storage tank and uses the stored hot water (for example, see Patent Document 1).

  FIG. 3 shows a conventional hot water supply apparatus described in Patent Document 1. As shown in FIG. As shown in FIG. 3, the hot water supply apparatus includes a heat pump unit 102 having a gas cooler (hot water supply heat exchanger) 101, and a hot water storage unit 104 having a hot water storage tank 103 in which water and generated hot water are stored. .

  The heat pump unit 102 is configured by connecting a compressor 105, a gas cooler 101, an expansion valve (decompression device) 106, and an evaporator 107 in a ring shape with a refrigerant pipe. Moreover, the lower part of the hot water storage tank 103, the circulation pump 108, the gas cooler 101, and the upper part of the hot water storage tank 103 are each connected by piping, and the water circuit is formed.

  Furthermore, the hot water supply apparatus described in Patent Document 1 is a water quality adjustment unit (adder) 109 that supplies an inhibitor that suppresses the generation of scale to the water circuit between the lower part of the hot water tank 103 and the gas cooler 101. It has.

JP 2011-69572 A

  However, in the conventional configuration, when maintenance such as replacement of the water quality adjustment unit is necessary, the operator needs to stop the operation of the hot water supply device, which makes maintenance of the water quality adjustment unit complicated. Had the problem of becoming.

  This invention solves the said subject, and it aims at providing the hot-water supply apparatus with which the maintainability of the water quality adjustment part improved.

  In order to solve the above-described conventional problems, the present invention provides a hot water storage tank for storing hot water, a water supply pipe through which water supplied to the lower part of the hot water storage tank flows, and a water supply pipe from the lower part of the hot water storage tank through an inlet pipe. A heating device that heats the generated water, and a tapping pipe that allows the water heated by the heating device to flow to the upper part of the hot water storage tank, wherein the water inlet pipe or the water supply pipe includes a main flow path, A water quality adjusting unit configured to detachably connect to the main flow path, reform the water quality of the inflowing water to a water quality that does not easily generate scale, A first closing valve disposed on the upstream side of the water quality adjusting unit to close the flow path, and a second closing valve disposed on the downstream side of the water quality adjusting unit to close the flow path. It is a hot water supply device.

  As a result, the main flow path is closed by the first shut-off valve and the second shut-off valve, and maintenance of the water quality adjustment unit is performed in a state where water is flowing in the sub-flow path, that is, in a state where the hot water supply device is operating. It can be carried out.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water supply apparatus with which the maintainability of the water quality adjustment part improved can be provided.

Configuration diagram of hot water supply apparatus in Embodiment 1 of the present invention Schematic configuration diagram of the water quality adjustment unit of the water heater Configuration diagram of conventional hot water supply equipment

  The first invention is a hot water storage tank for storing hot water, a water supply pipe through which water supplied to the lower part of the hot water storage tank flows, and a heating device for heating the water sent from the lower part of the hot water storage tank through a water inlet conduit And a hot water outlet pipe through which water heated by the heating device flows to the upper part of the hot water storage tank, wherein the water inlet pipe or the water supply pipe is a main flow path and a sub flow path that bypasses the main flow path The main flow path is configured to be detachable from the main flow path, and the water quality adjusting section for reforming and flowing out the water quality of the inflowing water into a water quality that does not easily generate scale, on the upstream side of the water quality adjusting section A hot water supply apparatus comprising: a first closing valve disposed to close the flow path; and a second closing valve disposed downstream of the water quality adjusting unit to close the flow path.

  Thereby, the main flow path is closed by the first closing valve and the second closing valve, and the water quality adjusting unit can be maintained in a state where water is flowing in the sub-flow path. Therefore, maintenance of the water quality adjusting unit can be performed without stopping the operation of the hot water supply apparatus.

  The second invention is characterized in that, in the first invention, in particular, the main flow path includes a drainage channel having a drainage valve between the first closing valve and the second closing valve.

  As a result, the water quality adjusting unit can be maintained after the pressure between the first closing valve and the second closing valve is reduced to atmospheric pressure by draining water from the drainage channel after closing the closing valve. . Therefore, the maintainability of the water quality adjusting unit is improved. In addition, when the water quality adjusting unit is not used for a long period of time, the water quality adjusting unit can be prevented from being damaged by freezing of water staying inside the water quality adjusting unit by draining from the drainage channel.

  A third invention is characterized in that, in particular, in the first or second invention, the drain valve is arranged on a vertically lower side of the water quality adjusting unit.

  Thereby, the water which retains in a water quality adjustment part can be drained efficiently. In addition, even when water is ejected from the drain valve during the drainage operation, it is possible to suppress the water from being applied to the worker, and to perform maintenance and replacement of the water quality adjusting unit more efficiently.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a hot water supply apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the hot water supply apparatus in the present embodiment includes a heating device 10, a hot water storage unit 4, and a water quality adjustment unit 40.

The heating device 10 includes a compressor 5 that compresses a refrigerant, and a heat exchanger 1 that performs heat exchange between the refrigerant and water.
1. A heat pump unit in which a decompression device (expansion valve) 6 for decompressing a refrigerant and an evaporator 7 for exchanging heat between air and the refrigerant are connected in an annular shape by a refrigerant pipe. Carbon dioxide circulates inside the refrigerant pipe. By using carbon dioxide as the refrigerant, the pressure on the high-pressure side of the heat pump unit becomes equal to or higher than the critical pressure.

  The hot water storage unit 4 includes a hot water storage tank 3 for storing water. A water supply pipe 12 is connected to the lower part of the hot water tank 3. The water supply pipe 12 is provided with a pressure reducing valve 13, and water supplied from the water pipe flows through the pressure reducing valve 13 and is depressurized, and then flows into the lower part of the hot water tank 3. A hot water supply pipe 14 is connected to the upper part of the hot water tank 3. Hot water stored in the hot water storage tank 3 is supplied via a hot water supply pipe 14 to a hot water supply terminal 17 such as a currant, a shower head, or a bathtub.

  The hot water storage unit 4 includes a bypass pipe 16 that branches from the water supply pipe 12 downstream of the pressure reducing valve 13 and is connected to the hot water supply pipe 14. A mixing valve 15 is disposed between the hot water supply pipe 14 and the bypass pipe 16. The hot water flowing out from the upper part of the hot water tank 3 to the hot water supply pipe 14 is mixed with the water flowing through the bypass pipe 16 in the mixing valve 15, and after the temperature is adjusted, the hot water flows through the hot water supply pipe 14 to the hot water supply terminal 17. Supplied with.

  The lower part of the hot water tank 3 and the heat exchanger 11 are connected to each other by a water intake pipe 18. The heat exchanger 11 and the upper part of the hot water storage tank 3 are connected to each other by a hot water discharge pipe 19. Thereby, the lower part of the hot water tank 3, the heat exchanger 11, and the upper part of the hot water tank 3 are connected in an annular shape by the water inlet pipe 18 and the hot water outlet pipe 19 in this order to form a water circuit. A circulation pump 8 that pumps water in the lower part of the hot water storage tank 3 to the heat exchanger 11 is disposed in the water inlet pipe 18 inside the hot water storage unit 4.

  The inlet pipe 18 has a main channel 18a and a sub channel 18b that bypasses the main channel 18a. A water quality adjusting unit 40 described later is disposed in the main flow path 18a.

  During the heating operation for heating the water in the hot water tank 3, the water stored in the lower part of the hot water tank 3 flows into the heat exchanger 11 through the water inlet pipe 18, and is heated by exchanging heat with the refrigerant. Hot water is produced. The generated hot water flows through the hot water outlet pipe 19 and flows into the upper part of the hot water storage tank 3.

  Further, a water temperature sensor 20 a that detects the temperature of the hot water heated by the heating device 10 is disposed in the outlet hot water pipeline 19 inside the heating device 10. A refrigerant temperature sensor 20 b is disposed in the refrigerant pipe between the compressor 5 and the heat exchanger 11. Furthermore, an outside air temperature sensor 21 that measures the outside air temperature is disposed inside the heating device 10. In addition, it is preferable that the outside air temperature sensor 21 is disposed in the evaporator 7 and disposed on the most upstream side with respect to the airflow flowing into the evaporator 7.

  The water quality adjustment unit 40 is disposed in the main flow path 18 a of the water intake pipe 18. The water quality adjusting unit 40 includes a water quality adjusting unit 23 that reforms the quality of the inflowing water to a quality that does not easily generate scale, and a drainage channel 26b having a drainage valve 26a. The water quality adjusting unit 40 includes connection portions 47a and 47b, and as the connection portions 47a and 47b connected to the main flow path 18a, for example, a union-type or screw-type joint can be used. The water quality adjusting unit 40 is configured to be detachable from the main flow path 18 a of the water inlet pipe 18 by connecting the connecting portions 47 a and 47 b and the water inlet pipe 18.

  Thereby, it is also possible to connect the connection parts 47a and 47b not by the water quality adjustment unit 40 but by separate piping. Therefore, the heating device 10 and the hot water storage unit 4 can be shared by the case where the water quality adjustment unit 40 is mounted and the case where the water quality adjustment unit 40 is not mounted.

  The water quality adjusting unit 23 is disposed in the main flow path 18a. The water quality adjusting unit 23 has a housing filled with the scale inhibitor 22. The water quality adjusting unit 23 has a function of dissolving the scale inhibitor 22 in the inflowing water, reforming it into water that hardly generates scale, and causing it to flow out. The water quality adjusting unit 23 in the present embodiment has an inflow port 23a vertically below the casing and an outflow port 23b vertically upward. Water flows into the water quality adjusting unit 23 from the inflow port 23a and flows out from the outflow port 23b. That is, the water quality adjusting unit 23 itself constitutes the main flow path 18a.

  Further, the water quality adjusting unit 23 is connected to the main flow path 18a through an inflow port 23a and an outflow port 23b. In this Embodiment, the water quality adjustment part 23 and the main flow path 18a are connected by the piping which comprises the main flow path 18a being inserted in the inflow port 23a and the outflow port 23b. That is, the water quality adjusting unit 23 is configured to be detachable from the main flow path 18a. In this case, it is preferable that a seal member such as an O-ring is disposed between the main flow path 18a and the inflow port 23a and the outflow port 23b. The inlet 23a and the outlet 23b can be, for example, a union type or screw type joint.

  The water quality adjusting unit 23 in the present embodiment is configured by filling a scale inhibitor 22 inside a PPS resin casing. With the housing made of PPS resin, the pressure resistance can be improved.

  When dissolved in water, the scale inhibitor 22 suppresses the growth of crystals of calcium carbonate or the like (scale component) contained in the water and suppresses the precipitation of scale. As the scale inhibitor 22, particles containing polyphosphate as a main component can be used. Typical polyphosphates include sodium tripolyphosphate and sodium hexametaphosphate, but other polyphosphates may be used. Moreover, you may use what has low molecular polymers, such as a phosphonic acid and a carboxylic acid type polymer electrolyte, as a main component.

  In the water quality adjusting unit 23 in the present embodiment, an inflow port 23a is disposed vertically below the casing, and an inlet / outlet 23b is disposed vertically above. Thereby, water flows from the lower side of the water quality adjusting unit 23 to the upper side through the housing of the water quality adjusting unit 23 filled with the scale inhibitor 22. As a result, the water flowing inside the water quality adjusting unit 23 is distributed throughout the water quality adjusting unit 23. Therefore, the solubility of the scale inhibitor 22 dissolved in water (the concentration of the scale inhibitor 22 contained in water per unit flow rate) can be stabilized.

  A shut-off valve (first shut-off valve) 25a is arranged in the main flow path 18a on the upstream side of the water quality adjusting unit 23. Further, a closing valve (second closing valve) 25b is arranged in the main flow path 18a on the downstream side of the water quality adjusting unit 23. Here, in the present embodiment, the shutoff valve 25a is disposed in the main flow path 18a on the upstream side of the connection portion 47a. Further, the shutoff valve 25b is disposed in the main flow path 18a on the downstream side of the connection portion 47b. The closing valve 25a and the closing valve 25b have a function of closing and opening the flow path of the main flow path 18a. The closing and opening of the closing valves 25a and 25b may be manually operated by an operator or automatically operated by a control device (not shown).

  A drainage channel 26b having a drainage valve 26a is disposed in the main channel 18a between the shutoff valve 25a and the inlet 23a. That is, the drainage channel 26 b is disposed inside the water quality adjustment unit 40. The drain valve 26a has a function of closing and opening the flow path of the drain path 26b. The closing and opening of the drain valve 26a may be manually operated by an operator, or may be automatically operated by a control device (not shown).

Here, the drain valve 26a is disposed below the water quality adjusting unit 23 in the vertical direction. Moreover, the front-end | tip of the drainage channel 26b is comprised facing the vertically downward side rather than the horizontal direction. Thereby, when draining from the drainage channel 26b, it can suppress that a worker splashes water.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, a heating operation for generating hot water by heating the water in the hot water tank 3 will be described first.

  In the heating operation, a control device (not shown) generates hot water by controlling the operations of the compressor 5, the decompression device 6, and the circulation pump 8.

  During the heating operation, the closing valves 25a and 25b are opened and the drain valve 26a is closed.

  In the heating device 10, the refrigerant flows into the compressor 5, is compressed to a critical pressure or higher, and is discharged from the compressor 5. The high-temperature and high-pressure refrigerant discharged from the compressor 5 flows into the heat exchanger 11. In the hot water storage unit 4, the water in the lower part of the hot water storage tank 3 flows through the water inlet pipe 18 and flows into the heat exchanger 11 by operating the circulation pump 8.

  The refrigerant that has flowed into the heat exchanger 11 radiates heat to the water that flows into the heat exchanger 11 from the inlet pipe 18, and then flows out of the heat exchanger 11. The refrigerant that has flowed out of the heat exchanger 11 is decompressed by the decompression device 6 and partially or entirely liquefied, and then flows into the evaporator 7. The refrigerant that has flowed into the evaporator 7 absorbs heat from the air and evaporates, and then flows into the compressor 5 again.

  The water flowing into the heat exchanger 11 absorbs heat from the high-temperature and high-pressure refrigerant and becomes hot water. Hot water flows out of the heat exchanger 11, flows through the hot water outlet 19, and flows from the upper part of the hot water tank 3 into the hot water tank 3 from the upper part of the hot water tank 3. Thus, hot water is generated by heat exchange between the refrigerant and water in the heat exchanger 11. Here, since carbon dioxide is used as a refrigerant, water can be heated to a high temperature (for example, 85 deg).

  During the heating operation, the control device controls the rotation speed of the circulation pump 8 so that the temperature of the hot water (heating temperature) detected by the water temperature sensor 20a becomes a predetermined temperature. Further, the control device controls the compressor 5 and the decompression device 6 based on the temperature of the refrigerant detected by the refrigerant temperature sensor 20b and the temperature of the outside air detected by the outside air temperature sensor 21.

  Here, the water sent from the lower part of the hot water tank 3 by the circulation pump 8 flows through the water intake pipe 18 and is divided into the main flow path 18a and the sub flow path 18b. The water flowing into the main flow path 18a passes through the water quality adjusting unit 23. At this time, the scale inhibitor 22 filled in the water quality adjusting unit 23 is dissolved in water. Therefore, the water in which the scale inhibitor 22 is dissolved flows out of the water quality adjusting unit 23, mixes with the water that has flowed through the auxiliary flow path 18 b, and flows into the heat exchanger 11.

  Components such as calcium carbonate contained in water have the property of crystallizing and precipitating when the water is heated to a high temperature. Therefore, by dissolving the scale inhibitor 22 in the water flowing into the heat exchanger 11, especially in the heat exchanger 11 through which high-temperature hot water flows and the tapping pipe 19, crystals such as calcium carbonate grow. It is possible to suppress the precipitation of scale.

  Further, the water quality adjusting unit 23 in the present embodiment is configured such that water flows in one direction from the lower side to the upper side inside the housing filled with the scale inhibitor 22. As a result, water spreads throughout the water quality adjusting unit 23. Therefore, the solubility of the scale inhibitor 22 flowing out from the water quality adjusting unit 23 is stabilized.

  The internal volume of the scale inhibitor 22 filled in the water quality adjusting unit 23 gradually decreases as it dissolves in water. When the internal volume decreases, the amount of the scale inhibitor 22 dissolved in water gradually decreases, and the effect of suppressing the precipitation of scale decreases. Therefore, it is necessary to perform maintenance such as replacing the water quality adjusting unit 23 or refilling the scale inhibitor 22 before the effect of suppressing the precipitation of scale is lost. Maintenance is preferably performed by removing the water quality adjusting unit 23 from the viewpoint of workability.

  The water quality adjusting unit 23 after the heating operation is subjected to the water pressure of the difference between the hot water storage tank 3 and the water quality adjusting unit 23. Therefore, when the water quality adjusting unit 23 is removed while the water pressure is applied, the hot water stored in the hot water tank 3 flows toward the main flow path 18a that is open to the atmosphere, and the hot water flows out. In particular, when hot water is stored in the entire hot water storage tank 3, the high-temperature water flowing out from the lower part of the hot water storage tank 3 flows out from the main flow path 18a open to the atmosphere, making maintenance more difficult.

  Therefore, in the hot water supply apparatus of the present embodiment, the shutoff valves 25a and 25b are arranged on the upstream side and the downstream side of the water quality adjusting unit 23, respectively. The flow path of the main flow path 18a can be closed by the shutoff valves 25a and 25b. Therefore, when the water intake pipe 18 is closed by the shutoff valves 25a and 25b and the water quality adjusting unit 23 is removed, only the water staying in the water intake pipe 18 between the shutoff valves 25a and 25b flows out. That is, water circulating inside the hot water supply device, for example, hot water in the hot water storage tank 3, does not flow out during maintenance. Thereby, the maintenance of the water quality adjusting unit 23 can be efficiently performed in a short time.

  Even if the shutoff valves 25a and 25b close the main flow path 18a, the water flowing out from the lower part of the hot water tank 3 to the water inlet pipe 18 flows through the sub flow path 18b and flows into the heat exchanger 11. . Therefore, the water quality adjusting unit 23 can be maintained while performing the heating operation of the hot water supply apparatus.

  Furthermore, the hot water supply apparatus of the present embodiment includes a drainage channel 26b having a drainage valve 26a in the main channel 18a between the shutoff valve 25a and the inflow port 23a. By closing the shutoff valves 25a and 25b and then opening the drain valve 26a, water staying between the shutoff valves 25a and 25b is drained from the drainage channel 26b. In addition, as described above, the water quality adjusting unit 23 is subjected to a water pressure of a difference in level between the hot water storage tank 3 and the water quality adjusting unit 23. Accordingly, the operator opens the drain valve 26a before draining the water quality adjusting unit 23, and drains water, so that the pressure inside the inlet pipe 18 between the shutoff valves 25a and 25b is changed to the atmospheric pressure. Can be lowered.

  Thereby, when removing the water quality adjustment part 23, it can prevent that water spouts by water pressure, and can maintain the water quality adjustment part 23 efficiently in a short time. Moreover, since the drainage channel 26b is disposed vertically below the water quality adjusting unit 23, drainage is improved, and it is possible to prevent hot water from being applied to the worker during drainage, thereby improving maintainability. To do.

  Further, when the water quality adjusting unit 23 is not used for a long period of time, the closing valves 25a and 25b are closed, and the drain valve 26a is opened. Therefore, the water staying between the closing valve 25a and the closing valve 25b is drained from the drainage channel 26b. Thereby, when external temperature falls, it can prevent that the water quality adjustment part 23 and the main flow path 18a are damaged by freezing of the water which retains in the water quality adjustment part 23 and the main flow path 18a.

  In the present embodiment, the water quality adjustment unit 40 closes the shutoff valves 25a and 25b, and removes the connecting portions 47a and 47b from the main flow path 18a, so that a large amount of water inside the hot water supply apparatus is not drawn. Easily removed.

  Further, the heating device 10 may use another heating device 10 such as a combustor using gas or an electric heater instead of the heat pump unit.

  Further, the drainage channel 26b is provided in the main flow path 18a between the shut-off valve 25a and the inflow port 23a, but in addition to this, the main flow path 18a between the outflow port 23b and the close-off valve 25b, and The water quality adjusting unit 23 may be provided vertically downward. Thereby, the water staying between the outlet 23b and the shutoff valve 25b can be smoothly drained.

  The example of the present invention is not limited to this. For example, the main flow path and the sub flow path may be arranged in the water supply pipe 12. In this case, the water quality adjustment unit 40 and the shutoff valves 25a and 25b are arranged in the main flow path formed in the water supply pipe 12. The main flow path is disposed downstream of the pressure reducing valve 13 with respect to the water flow direction of the water supply pipe 12. Thereby, the water decompressed by the pressure reducing valve 13 flows into the water quality adjusting unit 23. Therefore, it is not necessary to excessively increase the pressure resistance of the casing of the water quality adjusting unit 23, and the cost can be reduced. By arrange | positioning the water quality adjustment part 23 to the water supply pipe 12, the scale inhibitor 22 melt | dissolves in the water which flows in into the hot water storage tank 3. FIG. Therefore, since the water flowing into the heat exchanger 11 includes the scale inhibitor 22, the precipitation of scale can be suppressed as described above. Moreover, since water flows through the auxiliary flow path and is supplied to the hot water storage tank 3, maintenance of the water quality adjusting unit 23 can be performed without stopping the operation of the hot water supply apparatus.

  The main flow path is preferably arranged on the upstream side of the branch point between the water supply pipe 12 and the bypass pipe 16 with respect to the water flow direction of the water supply pipe 12. Thereby, since the water in which the scale inhibitor 22 is dissolved flows also in the bypass pipe 16, the solubility of the scale inhibitor in the hot water supplied to the hot water supply terminal 17 is kept above a certain level.

  Thus, when maintenance, such as replacement | exchange of the water quality adjustment part 23 and the filling of the scale inhibitor 22, is required, an operator closes a flow path with the closing valves 25a and 25b first. Next, the drain valve 26a of the drainage channel 26b is opened, and the water staying between the shutoff valve 25a and the shutoff valve 25b is drained. Next, the water quality adjusting unit 23 configured to be detachable from the water inlet pipe 18 is removed. Thereby, only the water staying between the shutoff valve 25a and the shutoff valve 25b is drained, and it is not necessary to drain the water in the entire hot water supply apparatus. Therefore, the maintenance of the water quality adjusting unit 23 can be performed efficiently.

  As described above, the hot water supply apparatus according to the present invention suppresses the precipitation of scale by the water quality adjustment unit, and also improves the maintainability of the water quality adjustment unit, so that it is applied to a hot water supply device for home use or business use. Can do.

DESCRIPTION OF SYMBOLS 3 Hot water storage tank 8 Circulation pump 10 Heating device 12 Water supply pipe 18 Water intake pipe 18a Main flow path 18b Subflow path 19 Hot water discharge pipe 23 Water quality adjustment part 25a, 25b Shut-off valve 26a Drain valve 26b Drain path

Claims (3)

A hot water tank for storing hot water,
A water supply pipe through which water supplied to the lower part of the hot water tank flows;
A heating device for heating the water sent from the lower part of the hot water storage tank through the water inlet pipe,
A hot water outlet pipe in which water heated by the heating device flows to the upper part of the hot water storage tank,
The water inlet pipe or the water supply pipe has a main flow path and a sub flow path that bypasses the main flow path,
The main flow path is configured to be detachable from the main flow path, and is provided on the upstream side of the water quality adjustment section, which is provided on the upstream side of the water quality adjustment section for reforming and flowing out the quality of the inflowing water to a water quality that does not easily generate scale. A hot water supply apparatus comprising: a first shut-off valve that closes a path; and a second shut-off valve that is disposed downstream of the water quality adjusting unit and closes the flow path. The hot water supply apparatus according to claim 1, wherein the main channel includes a drainage channel having a drainage valve between the first shutoff valve and the second shutoff valve. The hot water supply apparatus according to claim 1 or 2, wherein the drain valve is disposed vertically below the water quality adjusting unit.

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