JPH10192176A - Stored water circulation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge stored water in a storage tank from discharge devices installed at plural positions parted from the storage tank by operation at the installation position of each discharge device as a user is at the installation position. SOLUTION: A takeout conduit 24 is branched from a specified positions of a circulation conduit 18 to out-circulate bat water in a bathtub 20, and a three-way valve unit 26 to change water from an upstream side passage 18A to either of the takeout conduit 24 side and the downstream side passage 18B side is provided at the branched position. In addition, the takeout conduit 24 is provided with a water discharge device 36 comprising a discharge port 42, a discharge water opening/closing valve 44 to open/close it, a handle 46 for operation to open/close the discharge water opening/closing valve 44, and a limit switch 48 to detect opening/closing of it. A valve opening signal from the limit switch 48 is supplied as a valve changing signal, pump driving signal, or pump stopping signal to control parts 32, 16 of the three-way valve unit 26 and a circulation pump 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stored water circulating apparatus which makes it possible to effectively use remaining water and the like of bath water.

[0002]

BACKGROUND OF THE INVENTION Conventionally, an external circulation line and a circulation pump for externally circulating bath water in a bathtub are provided, and the bathwater in the bathtub is once taken out of the bathtub and purified by a purifier or a heating device. And then returning the bath water to the bathtub again, or vigorously spraying the bathwater taken out as a jet with air bubbles into the bathtub together with air.

[0003] Utilizing a bath water circulating device provided in such a bath water purifying device, a reheating device, a bubble bath device, or the like,
Means have been proposed for effectively utilizing the remaining water in the bathtub after bathing without directly discarding it. FIG. 5 shows an example (Japanese Patent Laid-Open No. 63-127051).

In FIG. 1, reference numeral 200 denotes a bath water heating device.
External circulation line 204 connected to bath 202, circulation pump 206 provided on circulation line 204, device body 20
7, heat exchanger section 208, heat exchanger section 2
At 08, a heating unit 210 for heating the bath water is provided. The bath water inside the bath tub 202 is taken out, heated, heated, and returned to the bath tub 202 again. Reference numeral 212 denotes a control unit of the heating device 200,
214 is a remote control operation unit.

[0005] In the heating device 200 shown in FIG.
The branch pipe 216 is branched from the circulation line 204, and a switching valve 218 is provided at the branch portion.
By the switching action of 18, the bath water circulated outside can be taken out from the outlet 220 through the branch pipe 216.

Here, the switching operation of the switching valve 218 is controlled by the control unit 212. Therefore, when the bath water, that is, residual water is taken out from the outlet 220, the remote control operating unit 214 is operated to switch the same. Will do.

[0007]

However, in the case of this circulating device, a remote control operating unit 2 provided in the bathroom is required.
Since the bath water is taken out from the outlet 220 based on the operation of 14, when the remaining water in the bath tub 202 is to be used in a place separated from the bathroom, for example, outdoors for car washing or other purposes, the bath water is taken out from the outside. There was a problem that the operation was not able to do this, making it inconvenient to use.

Accordingly, the applicant of the present application has filed a patent application (Japanese Patent Application No. Hei 8-60008) for a device capable of discharging the residual water in a bathtub from a water outlet provided outdoors by operation from the outdoors.
In the proposal.

FIG. 6 shows an example. In the figure, reference numeral 221 denotes a water discharging device provided outdoors,
22 and handle 224 for its operation, spout 226
And a limit switch 228.

In this example, a circulation line 230 for external circulation of bath water is formed to extend to a location of an outdoor water discharge device 221, to which a water discharge device 221 is connected, and a manual three-way is operated by operating a handle 224. Valve 222 is connected to circulation line 23
When the state is switched to a state where the upstream side passage 230A at 0 is communicated with the water discharge port 226, this is detected by the limit switch 228, and the detection signal is input as a start signal to the circulation pump 234 via the control unit 236 in the water heater 232. To start the circulation pump 234,
5 is discharged from the water discharge port 226 of the water discharge device 221. Note that 230B is a downstream passage in the circulation pipeline 230.

This device has a feature that the bath water (remaining water) in the bath tub 235 can be used by being discharged outdoors from a water discharge port 226 of a water discharge device 221 provided outdoors. In the case of the device, it is necessary to extend the circulation line 230 to the outdoor water discharge device 221 which is separated from the bathroom. For this purpose, two pipes for the circulation line 230 need to be concretely extended to a location away from the bathroom. Is a bathtub 235
Must be extended to the point where the residual water is discharged, making the construction work for the piping difficult.
When the hot water is supplied to the bathtub 235 or refired, the hot water heated by the hot water supply device 232 does not easily reach the bathtub 235, and there is a problem that a large amount of heat is lost.

In addition, in the case of this device, since the water discharge device 221 is provided directly on the circulation pipe 230, a plurality of water discharge devices 221 are provided so that the bathtub 235 can be freely accessed from a plurality of locations.
It was not possible to take out the residual water from the facilities, and there was a problem that was not satisfactory in terms of convenience.

[0013]

The stored water circulation device of the present invention has been devised to solve such a problem. According to the first aspect of the present invention, there is provided a storage water circulation device, comprising: a storage tank for storing a predetermined amount of water; a circulation pipe for externally circulating the water stored in the storage tank; and a circulation pump provided on the circulation pipe. In the stored water circulating device, a take-out line for taking out water in the circulating line from a predetermined portion of the circulating line is branched, and the taking-out line is closed and the circulating line is opened. Or a switching valve device for switching the flow path by closing the circulation pipe line by opening the extraction pipe line,
A water discharge port, a water discharge opening / closing valve that opens and closes the water discharge port, an operation unit of the water discharge opening / closing valve, and an opening / closing detection unit for the water discharge open / close valve are provided at a downstream portion of the switching valve device in the extraction pipe line. A water discharging device, and a valve opening signal or a valve closing signal from the opening / closing detection means of the water discharging opening / closing valve is used as a valve switching signal and a pump driving signal or a pump stop signal for the switching valve device and the circulating pump. And supplying it to a circulation pump.

According to a second aspect of the present invention, in the first aspect, a plurality of the water discharge devices are connected to the discharge line.

Further, in the storage water circulation device according to the third aspect, in any one of the first and second aspects, the switching valve device directs the flow of water in a passage on the upstream side of the circulation line to the discharge line side or to the discharge line side. A three-way valve device for switching to a downstream passage in a circulation line, wherein the three-way valve device is disposed at the branch portion of the discharge line from the circulation line.

According to a fourth aspect of the present invention, there is provided the stored water circulating apparatus according to any one of the first, second, and third aspects, wherein a drain tap is provided on the discharge pipe at a portion between the switching valve device and the water discharging device. It is characterized by the following.

Furthermore, in the storage water circulation device according to a fifth aspect of the present invention, in the fourth aspect, air is automatically introduced into each of the water discharge devices by a negative pressure generated in the discharge line. An air introduction means is provided.

Further, in the storage water circulating apparatus according to claim 6, in any one of claims 1, 2, 3, 4, and 5, the storage tank is a bath tub and the internal storage water is residual water of the bath water. The circulation pump is a circulation pump provided in a hot water supply device.

Further, in the storage water circulation device according to claim 7, in claim 6, the switching valve device is provided with a control unit for controlling operation of a switching valve as a main element thereof.
The control unit is characterized in that when the hot water supply device performs a heating operation of the bath water, the control unit controls the operation of the switching valve in a direction to connect the circulation pipeline.

[0020]

As described above, the storage water circulating apparatus according to the first aspect of the present invention provides a switching valve for branching the discharge pipe from the circulation pipe and switching the flow path between the circulation pipe and the discharge pipe. A device is provided, and a water discharge device having a water discharge port, a water discharge opening / closing valve, an operation part thereof, and open / close detection means is provided in a discharge pipe thereof, and a signal from the open / close detection means is supplied to the switching valve device and the circulation pump. In the case of this device, by operating the operation part of the water discharge device at a desired water discharge point, the water stored in the storage tank, for example, the remaining water in the bath tub can be discharged from the water discharge device, The advantage that the convenience when utilizing the stored water such as residual water in the inside is greatly improved.

Further, according to this apparatus, it is only necessary to extend one take-out pipe to the desired location of water discharge, and as in the prior application shown in FIG. 6, extend the circulation pipe itself to the desired location of water discharge. Since it is not necessary to do this, piping work becomes easy, and when it is applied to a bath water circulation device, the heated water does not easily reach the bathtub during hot water filling or reheating, and heat loss during that time. There is an advantage that the problem of many occurrences can be solved.

Further, according to this device, it is possible to connect a plurality of water discharging devices to a single take-out pipe at different locations (claim 2). The water stored in the storage tank, for example, the remaining water in the bathtub can be discharged at each of the locations, and the convenience is further enhanced. Moreover, in this case, since only one expensive switching valve device is required, the required cost can be reduced.

Here, the switching valve device for switching the flow path may be a three-way switching valve device.
Further, a signal from the opening / closing detection means of the water discharge opening / closing valve can be supplied to the circulation pump via the control unit of the switching valve device. Further, in that case, a signal to the circulation pump can be supplied via a pump control unit that controls the operation and stop of the pump.

According to a fourth aspect of the present invention, a drain valve is provided at a position between the switching valve device and the water discharging device in the discharge pipe. In the case of this device, the drain valve is provided between the switching valve device and the water discharging device. In this case, the water in the sealed extraction pipe can be extracted to the outside through the drain plug, and therefore, the problem that the water in the extraction pipe freezes and damages the piping can be solved.

In this case, it is also possible to operate the water discharge opening / closing valve in each water discharge device to open the water discharge port, and to introduce air from the water discharge port to smoothly drain the water from the water tap. However, in the case where an air introduction means for automatically introducing air into the extraction pipe according to claim 5 is provided in each water discharge device, automatic operation can be performed without performing a troublesome operation such as opening a water discharge opening / closing valve each time. The advantage is obtained that the air can be introduced in a simple manner and the drainage operation can be performed more easily.

The apparatus according to the first to fifth aspects is highly effective when applied to a bath water circulating apparatus (claim 6). In this case, the residual water in the bathtub can be effectively used, and for example, it is used for car washing or washing. When this is used as water, warm water having residual heat can be used, and advantages such as an enhanced cleaning effect can be obtained.

[0027] Next, in the device according to claim 7, the switching valve device is provided with a control unit for controlling the operation of the switching valve which is a main element thereof.
When the hot water supply device performs the heating action of the bath water, the operation of the switching valve is controlled by the control unit so that the switching valve is in the direction of communicating the circulation pipe, and according to this device, When the bath water is heated by the hot water supply device so as to use the bath tub, it is possible to avoid a disadvantage that a part of the bath water is taken out to the outside through the take-out pipe.

[0028]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; In FIG. 1, reference numeral 10 denotes a hot water supply device, in which a circulating pump 14 and a control unit 16 for controlling the operation thereof are built in a casing 12. Reference numeral 18 denotes a circulation line for externally circulating the bath water in the bathtub 20. The circulation pump 14 is provided on the circulation line 18. Reference numeral 22 denotes a bath water outlet / return port.

Reference numeral 24 denotes a take-out pipe which branches out from the circulation pipe 18 and extends therefrom. A three-way valve device 26 is provided at the branch point. The three-way valve device 26 is connected to the circulation line 18.
The flow of the bath water in the upstream passage 18A at the outlet pipe 24
Three-way valve 28 for selectively switching to the downstream side or the downstream passage 18B side in the circulation pipeline 18, a motor 30 for switching and driving the motor, and a control unit 32 for controlling the operation of the motor 30, that is, the operation of the three-way valve 28. ing.

Numeral 34 is a branch line in the discharge line 24, and a plurality of water discharge devices 36 are provided at different ends of each of the branch lines 34, that is, at the end portion of the discharge line 24. ing. These water discharging devices 36
One of them is for injecting water into the washing machine 38. still,
The washing machine 38 can be filled with water from a normal faucet 40.

Each water discharge device 36 has a water discharge port 42
A water discharge opening / closing valve 44 for opening / closing the water discharge port 42, more specifically, for opening / closing the branch pipe 34 in the extraction pipe 24 in the vicinity of the water discharge port 42, and a handle 46 as an operation part thereof
And a limit switch 48 as opening / closing detection means of the water discharge opening / closing valve 44. The limit switch 48 in each water discharging device 36 is connected to the control unit 32 in the three-way valve device 26 through a signal line 50.

The control unit 32 of the three-way valve device 26 is connected to the control unit 16 of the water heater 10 by the signal line 5.
0 is connected.

In this embodiment, when the water discharge opening / closing valve 44 of each water discharge device 36 is opened, the limit switch 48 is opened.
Is turned on to supply a valve opening signal to the control unit 32 of the three-way valve device 26. In response to this, the control unit 32 activates the motor 30 to switch the three-way valve 28 to a state in which the upstream passage 18 </ b> A in the circulation line 18 and the extraction line 24 communicate with each other.

The control unit 32 also supplies a valve opening signal to the control unit 16 of the hot water supply device 10 through the signal line 50 to activate the circulation pump 14. That is, in this example, the valve opening signal from the limit switch 48 is supplied to the control unit 16 of the water heater 10 via the control unit 32 of the three-way valve device 26. However, limit switch 48
Can be supplied to the control unit 32 of the three-way valve device 26 and the control unit 16 of the water heater 10 independently of each other.

In the storage water circulation device of the present embodiment, a plurality of water discharge devices 3 installed at locations separated from the bathroom, respectively.
The remaining water in the bathtub 20 can be discharged from the water outlet 42 of the sixth nozzle 6 by operating the handle 46 at the installation location.

That is, when the handle 46 of the desired water discharging device 36 is operated, the corresponding water discharging opening / closing valve 44 is opened and the limit switch 48 is turned on, and the valve opening signal is sent to the control unit 32 of the three-way valve device 26. Supply for

The control unit 32 of the three-way valve device 26, which has received the valve opening signal from the limit switch 48, drives the motor 30 to rotate so that the upstream passage 18A in the circulation line 18 communicates with the discharge line 24. In addition to switching the three-way valve 28 so as to achieve the above, the valve opening signal from the limit switch 48 is supplied to the control unit 16 of the water heater 10 through the signal line 50.

Then, the hot water supply device 10 which has received the valve opening signal
Of the bathtub 20 by activating the circulation pump 14
Internal residual water is pumped up through an external circulation line 18, specifically, an upstream passage 18A.

The remaining water in the bathtub 20 is supplied to the upstream passage 18.
The water flows from A to the take-out pipe 24 side, and is further discharged from the water discharge port 42 of the desired water discharge device 36 through the branch pipe 34. Further, when the water discharge opening / closing valve 44 is closed by operating the handle 46 of the water discharge device 36 at a predetermined location, a valve closing signal is sent from the limit switch 48 and the three-way valve 28 is switched to the circulation line 18.
Is switched to a state where the upstream passage 18A and the downstream passage 18B are communicated, and the circulation pump 14 stops operating.

In the present embodiment, when the hot water supply device 10 is performing hot water filling, additional heating, or the like,
When the hot water supply device 10 attempts to fill or re-boil the water while the remaining water is being discharged, that is, when the bathtub 20 is in use or when the bathtub 20 is used, as shown in FIG. The control unit 32 of the first embodiment controls the three-way valve 28, and the bath water in the bathtub 20 changes from the upstream passage 18A to the downstream passage 18B.
It is forcibly switched to a state that flows to the side.

That is, in this example, when the water discharge opening / closing valve 44 is opened by operating the handle 46 as shown in FIG. 2 (S10), while the bathtub 20 is being used in step 12, In other words, during the filling or reheating, the remaining water is not discharged from the water discharging device 36, but the refilling or reheating is continued.

On the other hand, when the water discharge opening / closing valve 44 is opened (Step 10), and when the bathtub 20 is not used in Step 12, the bath water (residual water) from the upstream passage 18A is taken out of the discharge pipe 24. The three-way valve 28 is switched to the state of flowing to the side (S14), the circulating pump 14 is started (S16), and the residual water is discharged from the water discharge port 42, and at the same time, a timer (for example, provided in the control unit 32 or the like) ( T)
, The measurement of the water discharge time is started (S18).

When the bathtub 20 is used while the bathwater is being discharged, that is, when the bath is filled with water or refired (S20), the control unit 32 controls the three-way valve 28 to transfer the bathwater from the upstream passage 18A to the downstream passage. The state is forcibly switched to the state of flowing to the 18B side (S30), the discharge of bath water from the water outlet 42 is stopped, and the measurement of the water discharge time is terminated (S32).

In the present embodiment, the handle 46 is operated during the water discharge from the water discharge port 42 to close the water discharge opening / closing valve 44 (S26), or when the water discharge time has continued for 2 minutes or more (S22). When a flowing water switch (flow switch) (not shown) provided on the upstream passage 18A is turned off, that is, the bath water in the bath tub 20 becomes empty, and the bath water inside the bath tub 20 enters the upstream passage 18A. Is stopped circulating (S24), the circulating pump 14 is stopped (S2).
8) The bath water from the upstream passage 18A is transferred to the downstream passage 18B.
The three-way valve 28 is switched to the state of flowing to the side (S30), and the water discharge from the water discharge port 42 is stopped. At the same time, the measurement of the water discharge time ends (S32).

As described above, in the stored water circulation device of this embodiment,
Three-way valve 2 according to valve opening signal from limit switch 48
8, and controls the circulation pump 14. In the case of this device, by operating the handle 46 of the water discharging device 36 at a desired water discharging point,
The residual water in the bathtub 20 can be discharged from the water discharge port 42 of the water discharging device 36, and the convenience when utilizing the residual water in the bathtub 20 is greatly increased.

Further, according to the apparatus of this embodiment, it is only necessary to extend the discharge pipe 24 to the desired location of the water discharge, so that the piping work is easier than before, and it is possible to use the apparatus in the case of filling with hot water or reheating. This eliminates the problem that the heated water does not easily reach the bathtub 20 or that a large amount of heat is lost during that time.

Further, according to the apparatus of the present embodiment, a plurality of water discharge devices 36 can be connected to the discharge pipe 24 at different places, respectively.
It is possible to discharge the residual water in the inside, and the convenience is further enhanced.

In the apparatus of the present embodiment, the control unit 32 forcibly switches the three-way valve 28 so that the upstream passage 18A and the downstream passage 18B communicate with each other when the hot water supply apparatus 10 performs additional heating or the like. According to this device, a part of the bath water is taken out to the outside through the take-out conduit 24 when the bath water is additionally heated in the hot water supply device 10 to use the bath tub 20. Can be prevented.

In the present invention, as shown in FIG. 3, a drain plug 52 is provided in the discharge line 24 to prevent freezing of residual water in the discharge line 24. The water discharge device 36 can be provided with an air charge plug (air introduction means) 54 for introducing air into the branch pipe 34.

In this manner, the water in the discharge pipe 24 in a sealed state can be satisfactorily discharged to the outside of the discharge pipe 24 under the introduction of air. That is, when the water drain plug 52 is opened, the air charge plug 54 is automatically opened due to the negative pressure generated in the discharge pipe 24, air is introduced into the discharge pipe 24, and water in the discharge pipe 24 is discharged to the outside. Is discharged smoothly.

FIG. 4 shows another example of the stored water circulation device of the present invention. Note that the same components as those in the embodiment of FIG. 1 are denoted by the same reference numerals in the drawing, and description thereof will be omitted.

In this example, reference numeral 56 denotes a solar hot water supply apparatus, and the apparatus main body 58 has a storage tank 60, and the water stored in the storage tank 60 is supplied to the circulation pump 14 provided in the apparatus main body 58. And is circulated through an external circulation line 18.

A solar collector 62 installed on a roof or the like is provided on the circulation line 18.
The stored water circulating through the solar collector 62 is heated when passing through the solar collector 62, warmed, and returned to the storage tank 60. In the drawing, reference numeral 64 denotes an automatic water supply device for keeping the amount of water in the storage tank 60 constant.

Also in this embodiment, the handle 46 of the water discharge device 36 is operated at a desired water discharge location separated from the device main body 58 having the storage tank 60, so that the water stored in the storage tank 60 is discharged by the water discharge device 36. It can be discharged from the water port 42.

That is, the water discharge opening / closing valve 44 is opened by operating the handle 46, and the valve opening signal from the limit switch 48 is transmitted to the control unit 32 of the three-way valve device 26 and the control unit 32 via the control unit 32. The three-way valve 28 is switched so that the water stored in the main body 58 is supplied to the control unit 16 and the water flowing from the upstream passage 18A flows toward the discharge pipe 24, and the circulation pump 14 is started. The stored water is discharged from 42.

Therefore, also in this embodiment, the convenience in utilizing the stored water in the storage tank 60 can be improved, and the stored water can be circulated through the circulation pipe 18 and returned to the storage tank 60. Loss of much heat can be prevented.

Although the embodiments of the present invention have been described in detail above, these are merely examples. For example, the water drainage plug 52 and the air charge plug 54 in FIG. 3 can be provided for the embodiment in FIG.

In each of the above embodiments, the flow path is switched by using the three-way valve 28 as a switching valve. However, separate open / close valves are provided for the circulation line 18 and the extraction line 24, respectively. Are simultaneously opened and closed. Specifically, the upstream passage 18A and the downstream passage 18B are kept in communication with each other, and when the water discharge opening / closing valve 44 is opened, the upstream passage 18A is simultaneously connected to the downstream passage 18A. In the present invention, various changes may be made without departing from the gist of the present invention, for example, the flow path may be switched so as to communicate with the upper take-out pipe line 24 interrupted by the on-off valve with respect to 18B. Can be configured.

[Brief description of the drawings]

FIG. 1 is a diagram showing a stored water circulation device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of the stored water circulation device of FIG.

FIG. 3 is a view showing a modification in which a drainage stopper and an air charge stopper are provided in the storage water circulation device of FIG. 1;

FIG. 4 is a diagram showing another embodiment of the present invention.

FIG. 5 is a diagram showing an example of a conventional stored water circulation device.

FIG. 6 is a diagram showing an example of an apparatus according to the prior application of the present application.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hot-water supply device 14 Circulation pump 16, 32 Control part 18 Circulation pipeline 18A Upstream passage 18B Downstream passage 20 Bathtub 24 Extraction pipeline 26 Three-way valve device 28 Three-way valve 34 Branch pipe 36 Water discharge device 42 Water outlet 44 Water discharge opening and closing Valve 46 Handle (operating section of the water discharge opening / closing valve) 48 Limit switch (open / close detection means of the water discharge opening / closing valve) 51 Signal line 52 Drain plug 54 Air charge plug (air introduction means) 56 Solar hot water heater 60 Storage tank

Claims (7)

[Claims] 1. A storage water circulation device comprising: a storage tank for storing a predetermined amount of water; a circulation pipe for externally circulating the water stored in the storage tank; and a circulation pump provided on the circulation pipe. At the same time, a branch line for taking out water in the circulation line is branched off from a predetermined portion of the circulation line, and the circulation line is opened by closing the discharge line, or the discharge line is opened. A switching valve device for switching the flow path by closing the circulation line is provided, and a water outlet, a water opening / closing valve for opening and closing the water outlet, at a downstream portion of the switching valve device in the extraction line; A water discharge device having an operation section of the water discharge opening / closing valve and a means for detecting the opening / closing of the water discharge opening / closing valve is provided. Valve switching signal and pump drive signal or pump stop The stored water circulation device is supplied as a stop signal to the switching valve device and the circulation pump. 2. The storage water circulation device according to claim 1, wherein a plurality of the water discharge devices are connected to the discharge conduit. 3. The switching valve device according to claim 1, wherein the switching valve device directs the flow of water in a passage on an upstream side of the circulation line to a side of the extraction line or a passage on a downstream side of the circulation line. A three-way valve device for switching, wherein the three-way valve device is disposed at the branch point of the discharge line from the circulation line. 4. The stored water circulation device according to claim 1, wherein a drain plug is provided in the extraction pipe at a position between the switching valve device and the water discharge device. 5. The water discharge device according to claim 4, wherein each of the water discharge devices is provided with air introduction means for automatically introducing air into the extraction pipe by a negative pressure generated in the extraction pipe. And the stored water circulation device. 6. The hot water supply device according to claim 1, wherein the storage tank is a bath, the internal storage water is remaining water of the bath water, and the circulation pump is connected to the hot water supply device. A stored water circulation device, which is a circulation pump provided. 7. The switching valve device according to claim 6, wherein the switching valve device is provided with a control unit for controlling operation of a switching valve as a main element thereof, and the control unit causes the hot water supply device to perform a heating operation of bath water. The stored water circulating device is characterized in that the operation of the switching valve is controlled in a direction for communicating the circulation pipe.