JP6882432B2 - Hot water heater - Google Patents

Description

The present invention relates to a hot water supply device having a function of saving water supply amount.

Conventionally, an energy-saving hot water supply device has been known in which a remote controller is provided with a saving switch to limit the amount of water flow to prevent water from flowing above a certain flow rate and to reduce water and gas costs (for example, a patent). Reference 1).

Japanese Unexamined Patent Publication No. 2001-116359

The technique disclosed in Patent Document 1 has a function of limiting the flow rate of the water amount control valve if the flow rate detected by the water amount sensor when the saving switch is turned on is equal to or higher than a certain flow rate. It was intended to improve convenience without affecting the use of hot water supply.

Here, the hot water supply system of the hot water supply device supplies hot water not only to the shower and the faucet in the bathroom but also to the kitchen and the washroom. In this case, if the flow rate is limited according to the flow rate used for washing dishes in the kitchen or washing the face in the washroom, the flow rate when using the shower in the bathroom is insufficient, and a comfortable shower pressure for the user cannot be obtained. On the other hand, if the flow rate is adjusted to the flow rate at which a comfortable shower pressure can be obtained, hot water may be supplied at an excessive flow rate for washing dishes in the kitchen or washing the face in the washroom, and there is a risk that the water saving effect cannot be obtained.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a hot water supply device capable of obtaining a shower feeling while ensuring a water saving effect.

In the hot water supply device according to the present invention, in order to solve the above-mentioned problems, the hot water supply means for supplying hot water from the shower in the bathroom and the equipment other than the shower, and the upper limit value of the flow rate of the hot water supply means are first set based on the instruction of the user. The flow rate control means includes a flow rate control means for controlling the flow rate of the water heater and a human sensor for detecting the presence of a user in the bathroom. It is characterized in that the value is controlled to a second flow rate larger than the first flow rate.

In the hot water supply device according to the present invention, a shower feeling can be obtained while ensuring a water saving effect.

Schematic system configuration diagram of the hot water storage type hot water supply device in this embodiment. A graph explaining the issues of water-saving operation function. The flowchart explaining the water saving release processing executed by the hot water supply apparatus in this embodiment. A graph explaining the effect of water saving release processing.

An embodiment of the hot water supply device according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic system configuration diagram of the hot water storage type hot water supply device 1 according to the present embodiment.

The hot water storage type hot water supply device (hot water supply device) 1 mainly includes a hot water storage tank unit 3, a heat pump unit 4, and a remote controller 5. Further, the hot water supply device 1 is connected to the bathtub 7, the shower 8, and the faucet 9.

The hot water storage tank unit 3 has a hot water storage tank 11 for storing hot water. The hot water storage tank 11 has a plurality of hot water storage temperature sensors 12 for detecting the hot water storage temperature in the hot water storage tank 11 in the vertical direction of the side surface. A water supply pipe 13 for supplying city water to the hot water storage tank 11 is connected to the bottom of the hot water storage tank 11. The water supply pipe 13 has a pressure reducing valve 14 that reduces the water supply pressure of city water to a constant pressure. Further, an overpressure relief valve 16 for releasing the overpressure in the hot water storage tank 11 is connected to the top of the hot water storage tank 11.

A hot water discharge pipe 18 for hot water to be discharged from the hot water storage tank 11 is connected to the top of the hot water storage tank 11. The hot water outlet pipe 18 is connected to the water supply bypass pipe 20 branched from the water supply pipe 13 via the hot water supply mixing valve 19. The water supply bypass pipe 20 has a water supply temperature sensor 25 that detects the water supply temperature.

The hot water supply mixing valve 19 mixes the hot water from the water supply bypass pipe 20 and the hot water from the hot water outlet pipe 18 so as to reach the hot water supply set temperature. The hot water supply mixing valve 19 is connected to the hot water supply pipe 24, and the hot water mixed by the hot water supply mixing valve 19 is guided to the shower 8 and the curan 9 by the hot water supply pipe 24. The hot water supply pipe 24 includes a hot water supply flow rate sensor 26, a hot water supply temperature sensor 27, and a flow rate adjusting valve 28. The hot water supply flow rate sensor 26 and the hot water supply temperature sensor 27 detect the flow rate and temperature of hot water flowing through the hot water supply pipe 24, respectively. The flow rate adjusting valve 28 adjusts (limits) the flow rate of hot water flowing through the hot water supply pipe 24 by adjusting the opening degree.

The hot water supply pipe 24 is connected to a hot water beam pipe 32 that supplies hot water to the bath circulation circuit 40. The hot water beam pipe 32 has a hot water beam flow rate sensor 33, a hot water beam temperature sensor 34, and a hot water beam on-off valve 35. The hot water flow rate sensor 33 and the hot water temperature sensor 34 detect the flow rate and temperature of hot water supplied from the hot water pipe 32, respectively. The hot water beam on-off valve 35 is a solenoid valve that opens and closes the hot water beam pipe 32.

The hot water storage tank unit 3 has a bath circulation circuit 40 that circulates the hot water (bath water) of the bathtub 7 between the bathtub 7 and the bath heat exchanger 41. The bath circulation circuit 40 mainly includes a return pipe 42, a bath heat exchanger 41, and an outgoing pipe 43. The return pipe 42 returns the bath water to the bath heat exchanger 41. The bath heat exchanger 41 is provided in the upper part of the hot water storage tank 11, and heats the bath water with the heat of the hot water in the hot water storage tank 11. The going pipe 43 supplies the hot water heated by the bath heat exchanger 41 to the bathtub 7 side.

The bath circulation circuit 40 has a heat exchange bypass pipe 46 that bypasses the return pipe 42 and the outgoing pipe 43 via the bath three-way valve 45. The bath three-way valve 45 switches between circulating hot water from the return pipe 42 to the bath heat exchanger 41 and bypassing it to the outgoing pipe 43.

Further, the return pipe 42 has a water level sensor 48, a bath temperature sensor 49, and a bath circulation pump 50. The water level sensor 48 detects the water level in the bathtub 7. The bath temperature sensor 49 detects the temperature of the circulating hot water. The bath circulation pump 50 circulates bath water in the bath circulation circuit 40. The going pipe 43 has a flowing water switch 51 that detects the presence or absence of circulation of bath water in the bath circulation circuit 40.

The hot water storage tank unit 3 has a hot water storage control unit 55 that electrically controls the hot water storage tank unit 3. The hot water storage control unit 55 has a logic circuit such as an MPU, and electrically controls the hot water storage tank unit 3 according to a program stored in advance while referring to the memory. That is, the hot water storage control unit 55 includes a hot water storage temperature sensor 12, a water supply temperature sensor 25, a hot water supply flow rate sensor 26, a hot water supply temperature sensor 27, a hot water flow rate sensor 33, a hot water supply temperature sensor 34, a water level sensor 48, a bath temperature sensor 49, and The detected value of the flowing water switch 51 is acquired, and the operation of various valves of the hot water storage tank unit 3 is controlled based on the detected value. Further, the hot water storage control unit 55 receives a user's instruction via the remote controller 5, controls each unit, and executes the instruction. That is, the hot water storage control unit 55 executes hot water supply operation, automatic bath operation, bath reheating operation, and the like based on the hot water supply set temperature, the bath set temperature, the set hot water amount, and the like instructed by the remote controller 5.

The hot water storage tank unit 3 is connected to the heat pump unit 4 that boil the hot water in the hot water storage tank 11 mainly at midnight via a heating forward pipe 65 and a heating return pipe 66. The heat pump unit 4 includes these heating forward pipes 65 and heating return pipes 66, a refrigerant circuit 61, a heating control unit 62, and an outside air temperature sensor 63.

The heating going pipe 65 circulates hot water taken out from the bottom of the hot water storage tank 11. The heating outbound pipe 65 includes a heating circulation pump 64 that supplies hot water from the hot water storage tank 11, and a water inlet temperature sensor 69 that detects the temperature of hot water flowing into the refrigerant water heat exchanger 68 from the heating outbound pipe 65. There is. The heating return pipe 66 returns the hot water heated by the heat pump unit 4 to the upper part of the hot water storage tank 11. The heating return pipe 66 has a boiling temperature sensor 70 that detects the temperature of hot water flowing out from the refrigerant water heat exchanger 68 to the heating return pipe 66.

The refrigerant circuit 61 is a circuit in which a compressor 71, a refrigerant water heat exchanger 68, an expansion valve 72, and an evaporator 73 are cyclically connected by a refrigerant cycle pipe 74. The compressor 71 compresses the refrigerant into a high-temperature refrigerant. The refrigerant water heat exchanger 68 exchanges heat between the high temperature refrigerant and the hot water from the hot water storage tank 11. The expansion valve 72 decompresses the refrigerant radiated by the refrigerant water heat exchanger 68 to obtain a low-temperature low-pressure refrigerant. The evaporator 73 evaporates the low temperature and low pressure refrigerant. Further, outside air serving as a heat source is blown to the evaporator 73 by the blower 75.

The outside air temperature sensor 63 detects the outdoor outside air temperature in which the heat pump unit 4 is installed. The heating control unit 62 has a logic circuit such as an MPU, and electrically controls the heat pump unit 4 according to a program stored in advance while referring to a memory. That is, the heating control unit 62 acquires the detected values of the water entry temperature sensor 69, the boiling temperature sensor 70, and the outside air temperature sensor 63, and controls the operation of the refrigerant circuit 61 and the like. Further, the heating control unit 62 has a calendar / clock unit 82.

The bathroom 6 is provided with a bathtub 7, a shower 8 and a remote controller 5. The remote controller 5 has a display unit 91 and switches such as a bath automatic operation switch 93, a setting switch, and a menu switch. The display unit 91 displays various information regarding the hot water supply device 1 (hot water supply set temperature, bath set temperature, bath set hot water amount, residual hot water amount, operating state of the hot water supply device 1 and the like). The setting switch accepts instructions for setting the hot water supply set temperature, the bath set temperature, and the bath set hot water amount. The bath automatic operation switch 93 automatically operates the hot water in the bathtub 7 to reach the target water level and temperature based on the bath set temperature and the amount of hot water, and after the completion of the hot water filling, the heat retention time is maintained so as to maintain the target water level and temperature. Accepts instructions to automatically keep warm until the time passes. The menu switch calls a hierarchical menu setting screen for making detailed settings for the hot water supply device 1. The water-saving operation function, which will be described later, accepts settings via these switches.

The remote controller 5 has a motion sensor 98 and an illuminance sensor 99. The motion sensor 98 detects that there is a user in the bathroom 6 by infrared rays or the like. The illuminance sensor 99 detects the illuminance in the bathroom 6. Further, the remote controller 5 has a logic circuit such as an MPU, and has a remote controller control unit 97 that electrically controls the remote controller 5 according to a program stored in advance while referring to a memory. The remote control control unit 97 receives an instruction signal of switches and a signal from the hot water storage control unit 55, and causes the display unit 91 to display necessary information predetermined. The hot water storage control unit 55, the heating control unit 62, and the remote control unit 97 described above are connected so as to be able to transmit and receive necessary information to each other.

The shower 8 and the faucet 9 as the appliances for supplying hot water by the hot water supply means are provided in the bathroom 6 or in the kitchen or washroom outside the bathroom 6. The hot water supply pipe 24 as a hot water supply means is branched on the downstream side of the flow rate adjusting valve 28, and supplies hot water in parallel to the shower 8 provided in the bathroom 6 and the faucets 9 in various places. Here, the hot water supply device 1 has a water saving operation function from the viewpoint of energy saving. Specifically, the water saving operation function is a function of limiting the flow rate of the hot water supply pipe 24 by the flow rate adjusting valve 28 so that a flow rate equal to or higher than the set flow rate set by the user is not supplied via the remote controller 5. The set flow rate is set by the flow rate such as 6 L / min, 8 L / min, 10 L / min, 12 L / min, or is set by the opening degree of the flow rate adjusting valve 28 such as 30%, 50%, 70%. Or Alternatively, the corresponding flow rate and opening degree are set by selecting the assigned level (weak, medium, strong, etc.).

This water-saving operation function has the following problems. FIG. 2 is a graph for explaining the problem of the water saving operation function. FIG. 2A shows the hot water supply flow rates of the faucet and the shower when the set flow rate is set to the set value A. FIG. 2B shows the hot water supply flow rates of the faucet and the shower when the set flow rate is set to the set value B lower than the set value A.

Generally, the hot water supply flow rate of the hot water used in the faucet 9 of the kitchen or the washroom is smaller than the hot water supply flow rate of the hot water used in the shower 8 of the bathroom 6. Therefore, when the water-saving operation function is set to a flow rate (set value A) that does not impair the usability of the shower 8, the water-saving effect (dotted line) is applied to the excessive hot water supply of the shower 8 as shown in FIG. 2 (a). Part) and usability can be obtained at the same time. However, for hot water supply from the faucet 9 in the kitchen or the like, even if it is used excessively, the flow rate is not as high as the set value A, so that the water saving operation function does not work and the water saving effect cannot be obtained. On the other hand, when the water-saving operation function is set to a flow rate (set value B) that is effective for the faucet 9 in the kitchen or washroom, as shown in FIG. 2B, the faucet 9 in the kitchen or the bathroom 6 A water-saving effect (dotted line portion) can be obtained for excessive hot water supply from the shower 8. However, the usability of the shower 8 may be significantly impaired.

On the other hand, the hot water supply device 1 in the present embodiment obtains a water saving effect without impairing the usability of the shower 8 by canceling or relaxing the water saving operation function in a situation where the shower 8 is considered to be used. be able to. Hereinafter, a specific description will be given.

FIG. 3 is a flowchart illustrating a water saving release process executed by the hot water supply device 1 in the present embodiment. FIG. 4 is a graph illustrating the effect of the water saving release treatment.

In step S1, the hot water storage control unit 55 determines whether or not the water saving operation function is set. When the water saving operation function is set, the flow rate adjusting valve 28 is adjusted to the opening degree based on the setting at this point, and the upper limit of the amount of hot water supplied from the hot water supply pipe 24 is the first flow rate (hereinafter, "water saving"). It is limited to "flow rate"). The hot water storage control unit 55 and the flow rate adjusting valve 28 function as flow rate control means for controlling the upper limit of the flow rate of the hot water supply means to the first flow rate based on the instruction of the user. When the hot water storage control unit 55 determines that the water saving operation function is not set (NO in step S1), the hot water storage control unit 55 ends the process.

On the other hand, when it is determined that the water saving operation function is set (YES in step S1), in step S2, the hot water storage control unit 55 determines whether or not the shower 8 in the bathroom 6 is in use. Whether or not the shower 8 is in use is determined based on the shower use determination conditions described later. When the hot water storage control unit 55 determines that the shower 8 is not in use (NO in step S2), it returns to the setting determination step S1.

On the other hand, when it is determined that the shower 8 is in use (YES in step S2), the hot water storage control unit 55 cancels the water saving operation function in step S3. Specifically, the hot water storage control unit 55 controls the opening degree of the flow rate adjusting valve 28 so that the upper limit value of the flow rate becomes a second flow rate (hereinafter, referred to as “water saving release flow rate”) that is larger than the water saving flow rate. .. For example, as shown in FIG. 4, the flow rate set in the set value B as the water saving flow rate is changed to the set value A as the water saving release flow rate when the shower use determination condition is satisfied. As a result, even when the shower 8 is used, the shower feeling is not impaired without being limited by the water saving flow rate.

The water saving release flow rate may be the flow rate when the flow rate adjusting valve 28 is fully opened (opening 100%), or is larger than the water saving flow rate obtained at an opening smaller than the fully open to alleviate the water saving flow rate. It may be a large flow rate. When the water saving flow rate is relaxed, for example, when the water saving flow rate is set to a flow rate of 30% of the opening degree of the flow rate adjusting valve 28, the water saving release flow rate is controlled to a flow rate of 60% of the opening degree.

In step S4, the hot water storage control unit 55 determines whether or not the use of the shower 8 has been completed. The determination as to whether or not the use of the shower 8 is completed is made based on the shower end determination condition described later. When the hot water storage control unit 55 determines that the use of the shower 8 has not been completed (NO in step S4), the hot water storage control unit 55 waits until it determines that the use of the shower 8 has been completed.

On the other hand, when it is determined that the use of the shower 8 is finished (YES in step S4), the hot water storage control unit 55 returns to the water saving operation function in step S5. Specifically, the hot water storage control unit 55 controls the opening degree of the flow rate adjusting valve 28 so that the upper limit value changes from the water saving release flow rate to the water saving flow rate. After that, the process returns to the setting determination step S1.

Next, the shower use determination condition used in the use determination step S2 and the shower end determination condition used in the end determination step S4 will be described. The shower use determination condition is a condition used for determining whether or not the hot water storage control unit 55 is using the shower 8. When this condition is met, the hot water storage control unit 55 considers that the user is using the shower 8. The shower end determination condition is a condition used for determining whether or not the use of the shower 8 is completed after the hot water storage control unit 55 determines that the shower 8 is being used based on the shower use determination condition. .. When this condition is met, the hot water storage control unit 55 considers that the user has finished using the shower 8. As an example, there are six conditions for shower use and termination determination, which will be specifically described below.

The first shower use determination condition is that the motion sensor 98 provided on the remote controller 5 detects that the user is in the bathroom 6. The first shower end determination condition corresponding to this is that the motion sensor 98 does not continuously detect that the user is in the bathroom 6 for a predetermined time (for example, 10 minutes). This is because when the motion sensor 98 detects that there is a user in the bathroom 6, it is highly likely that the user is taking a bath and the shower 8 is likely to be used. Further, if the motion sensor 98 does not detect the motion sensor 98 continuously for a predetermined time, it is highly likely that the user has left the bathroom 6 and the shower 8 is unlikely to be used.

The second shower use determination condition is that the water level sensor 48 detects a change in a predetermined water level (for example, 3 cm) in the bathtub 7 in which the user is considered to have entered the bathtub 7. It is preferable that the shower use determination condition is further conditional on the continuous detection of the water level change for a predetermined time (for example, 30 seconds). The second shower end determination condition corresponding to this is that a predetermined time (for example, 20 minutes) has elapsed since the change in the water level was detected. This is because when the water level sensor 48 detects a change in a predetermined water level, it is highly likely that the person is taking a bath, and the shower 8 is likely to be used with the bathing. Further, when a predetermined time elapses after detecting the change in the water level, it is highly possible that the bathing is completed and the shower 8 is unlikely to be used.

The third shower use determination condition is that the bath automatic operation switch 93 of the remote controller 5 receives an instruction for automatic bath operation. In the present embodiment, the remote controller 5 (bath automatic operation switch 93), the remote controller control unit 97, and the hot water storage control unit 55 set the hot water in the bathtub 7 as the target water level and temperature based on the user's instruction received by the remote controller 5. It functions as a bath automatic operation means that operates the hot water so as to be, and automatically keeps the heat until a predetermined heat retention time elapses so as to maintain the target water level and temperature after the completion of the hot water. The third shower end determination condition corresponding to this is that a predetermined heat retention time (for example, 120 minutes) has elapsed since the bath automatic operation switch 93 received the instruction of the bath automatic operation. This is because when the instruction for automatic bath operation is received, there is a high possibility that the bathing will be started, and the shower 8 is likely to be used along with the bathing. Further, when the heat retention time elapses after receiving the instruction for automatic bath operation, it is highly likely that the bathing has been completed and the shower 8 is unlikely to be used.

The fourth condition for determining the use of the shower is that the hot water filling operation included in the automatic bath operation has been completed. The completion of the hot water operation is that the hot water in the bathtub 7 reaches the target water level and temperature after the automatic bath operation is started. When the hot water operation is completed, the user is notified by a notification sound or the like. The fourth shower end determination condition corresponding to this is that the bath automatic operation switch 93 receives an instruction from the user to cancel the automatic bath operation. This is because when the hot water operation is completed, there is a high possibility that the bathing will be started, and there is a high possibility that the shower 8 will be used along with the bathing. Further, when the instruction to cancel the automatic bath operation is received, it is highly possible that the bathing is completed and the shower 8 is unlikely to be used. The third shower use determination condition and the fourth shower end determination condition may be combined, or the fourth shower use determination condition and the third shower end determination condition may be combined.

The fifth shower use determination condition is that the illuminance sensor 99 detects the illuminance (lighting illuminance) at which the lighting of the bathroom 6 is considered to be turned on. The shower use determination condition is further preferably a condition that the lighting illuminance is continuously detected for a predetermined time (for example, 30 seconds). Since it is highly possible that the person is taking a bath at night because the lighting is turned on, the illuminance sensor 99 is turned on at night with reference to the calendar / clock unit 82 of the heating control unit 62. It is preferable that the illuminance is detected. In addition, it is preferable to change the definition of nighttime depending on the season to improve the determination accuracy. The definition of night is, for example, 18:00 in spring and autumn, 19:00 in summer, and 17:00 in winter. The fifth shower end determination condition corresponding to this is that the illuminance sensor 99 detects the illuminance (extinguished illuminance) at which the lighting of the bathroom 6 is considered to be turned off. The shower end determination condition is further preferably a condition that the extinguishing illuminance is continuously detected for a predetermined time (for example, 30 seconds). This is because when the lighting illuminance is detected, there is a high possibility that the lighting is accompanied by bathing, and there is a high possibility that the shower 8 will be used. Further, when the extinguishing illuminance is detected, it is highly likely that the extinguishing illuminance is turned off at the end of bathing, and the possibility that the shower 8 is used is low.

The sixth shower use determination condition is that the hot water supply flow rate sensor 26 detects a flow rate (shower flow rate, for example, 8 L / min) deemed to be using the shower 8. The shower use determination condition is further preferably a condition that the shower flow rate is continuously detected for a predetermined time (for example, 10 seconds). The sixth shower end determination condition corresponding to this is that the hot water supply flow rate sensor 26 detects a flow rate (non-shower flow rate, for example, 5 L / min or less) that is considered not to use the shower 8. This is because when the hot water supply flow rate sensor 26 detects the shower flow rate, it is highly possible that the shower 8 is being used. Further, when the hot water supply flow rate sensor 26 detects the non-shower flow rate, it is unlikely that the shower 8 is used.

These first to sixth shower use and end determination conditions may be used alone for the water saving release treatment, or may be used in combination of a plurality of conditions.

Such a hot water supply device 1 in the present embodiment can obtain a shower feeling while ensuring a water saving effect. Further, by setting the conditions for canceling or alleviating the water saving operation function in detail like the above-mentioned first to sixth shower use determination conditions, it is possible to prevent unnecessary water saving from being canceled or alleviated, and effective water saving can be prevented. The effect can be obtained.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

For example, the flow rate adjusting valve 28 may be a water proportional valve that controls the flow rate of hot water.

Further, the hot water supply device 1 has an electric heater type heating means in the hot water storage tank 11 instead of the heat pump unit 4, and has an instantaneous heat exchanger (bath heat exchanger) for heating with a gas burner or an oil burner. Alternatively, it may have a waste heat recovery device for a cogeneration system.

1 Hot water storage type hot water supply device (hot water supply device)
3 Hot water storage tank unit 4 Heat pump unit 5 Remote control 6 Bathroom 7 Bathtub 8 Shower 9 Callan 11 Hot water storage tank 24 Hot water supply pipe 26 Hot water supply flow sensor 28 Flow control valve 40 Bath circulation circuit 48 Water level sensor 55 Hot water storage control unit 61 Refrigerator circuit 62 Heating control unit 82 Calendar / clock unit 93 Automatic bath operation switch 97 Remote control unit 98 Human sensor 99 Illumination sensor

Claims (5)

Hot water supply means for supplying hot water from the shower in the bathroom and equipment other than the shower,
A flow rate control means that controls the upper limit of the flow rate of the hot water supply means to the first flow rate based on a user's instruction, and
A motion sensor for detecting the presence of a user in the bathroom is provided.
The hot water supply device is characterized in that, when the motion sensor detects that a user is present, the flow rate control means controls the upper limit value to a second flow rate larger than the first flow rate. Hot water supply means for supplying hot water from the shower in the bathroom and equipment other than the shower,
A flow rate control means that controls the upper limit of the flow rate of the hot water supply means to the first flow rate based on a user's instruction, and
Equipped with a water level sensor that detects the water level in the bathtub,
When the water level sensor detects a change in the water level in the bathtub, which is considered to be a user entering the bathtub, the flow rate control means controls the upper limit value to a second flow rate larger than the first flow rate. A hot water supply device characterized by Hot water supply means for supplying hot water from the shower in the bathroom and equipment other than the shower,
A flow rate control means that controls the upper limit of the flow rate of the hot water supply means to the first flow rate based on a user's instruction, and
It is equipped with an automatic bath operation means that operates the hot water in the bathtub so that it reaches the target water level and temperature based on the user's instructions.
The flow rate control means is a hot water supply device characterized in that when the bath automatic operation means completes the hot water filling operation, the upper limit value is controlled to a second flow rate larger than the first flow rate. Hot water supply means for supplying hot water from the shower in the bathroom and equipment other than the shower,
A flow rate control means that controls the upper limit of the flow rate of the hot water supply means to the first flow rate based on a user's instruction, and
An illuminance sensor for detecting the illuminance in the bathroom is provided.
The flow rate control means is characterized in that when the illuminance sensor detects an illuminance at which the bathroom lighting is considered to be turned on, the upper limit value is controlled to a second flow rate larger than the first flow rate. Hot water supply device. It said flow control means determines whether or not considered with the use of the shower is finished, if it is determined to be complete, according to claim 1 for controlling the upper limit value from the second flow rate to said first flow rate The hot water supply device according to any one of 4 to 4.

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