JP2002147843A - Hot-water supplier for bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-water supplier for bath, which is capable of preventing an increase in uncomfortable feeling of a user or the amount of refilling hot-water and excellent in handleability without requesting any manual setting of the temperature of the refilling hot-water to the user. SOLUTION: Upon the refilling of bath water into a bathtub 1, a controller 200 controls a refilling water temperature so as to be lowered in accordance with the rise-up of an outdoor air temperature detected by an outdoor air temperature sensor 70. According to this method, the controller 200 will not control the temperature of bath water near the discharging port 3 of hot-water in the bathtub 1 so as to be raised when the outdoor air temperature is high or the same will not control the frequency of refilling hot-water so as to be increased when the outdoor air temperature is low. Accordingly, increase in uncomfortable feeling of the user or the amount of refilling hot-water can be prevented and the user will not be requested to set the refilling hot-water temperature through manual control whereby the handling convenience of the hot-water supplier for bath can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath water heater for supplying hot water into a bathtub, and more particularly to a bath water heater capable of supplying hot water to bath water in the bathtub.

[0002]

2. Description of the Related Art Conventionally, when the temperature of bath water in a bath tub is lowered and a user turns on the bath water in a bath tub, when a bath water switch is turned on, a bath for supplying hot water at a predetermined temperature is used. There is a water heater.

[0003] In such a bath water heater, when the temperature of the hot water is set to a relatively high temperature (for example, 80 ° C), especially in a high outdoor temperature such as in the summer, the vicinity of the discharge port of the hot water in the bathtub is required. Since the bath water remains at a high temperature, a problem that the user feels discomfort is likely to occur. When the temperature of the hot water is set to a relatively low temperature (for example, 60 ° C.), the above-described problem does not occur, but the amount of hot water increases because the frequency of hot water increases at low outside temperatures such as winter. Is likely to occur.

[0004] As a technique for solving these problems, a user sets the temperature of hot water at a plurality of temperatures (for example, 80 ° C and 60 ° C).
(° C.) is known.

[0005]

However, in the above-mentioned prior art, there is a problem that the user has to set the temperature of the hot water manually, which is inconvenient.

The present invention has been made in view of the above points, and can prevent the user from feeling uncomfortable and increasing the amount of hot water, and does not require the user to manually set the temperature of hot water. It is an object of the present invention to provide a user-friendly bath water heater.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, an outside air temperature detecting means (70) for detecting an outside air temperature, and a hot water bath in the bathtub (1). When performing, the control means (200) for controlling so that the temperature of the hot water decreases as the outside air temperature detected by the outside air temperature detection means (70) increases. .

According to this, the control device (200) sets the temperature of the hot water to a low temperature when the outside temperature is high, for example, in summer, and raises the temperature of the hot water to a high temperature when the outside temperature is low, for example, in winter. Can be Therefore,
At high outside air temperature, the temperature of the bath water near the outlet (3) of the hot water in the bathtub (1) becomes high. It won't be much. In this way, it is possible to prevent the user from feeling uncomfortable or increasing the amount of hot water, and it is not necessary for the user to manually set the temperature of the hot water, so that the usability can be improved. Further, a switch for setting the temperature of the hot water by the user becomes unnecessary.

In the invention according to a second aspect, the control means (200) controls the supply amount of the hot water to decrease per hour as the temperature of the hot water increases. I have.

According to this, as the temperature of the hot water rises, the flow velocity of the hot water decreases. Therefore, a large amount of hot water is not supplied into the bathtub (1) in a short time. In this way, the user's discomfort can be further prevented.

In the invention according to claim 3, the outside air temperature detecting means (70) is a temperature sensor provided outdoors. According to this, the outside air temperature can be reliably detected.

Further, according to the invention described in claim 4, the outside air temperature detecting means (10, 11, 16, 200) includes a bathtub (1).
A bath water temperature detecting means (16) for detecting a temperature of the bath water in the inside, and detecting an outside air temperature based on a temperature decrease amount of the bath water in a predetermined time detected by the bath water temperature detecting means (16). It is characterized by.

According to this, the outside air temperature can be detected based on the bath water temperature information from the bath water temperature detecting means (16). Therefore, there is no need to provide a temperature sensor for directly detecting the outside air temperature.

The reference numerals in parentheses attached to the respective means indicate the correspondence with specific means described in the embodiments described later.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a schematic diagram showing a schematic configuration of a bath water heater according to a first embodiment.

The main unit 100 of the bath water heater (FIG. 1)
The portion surrounded by the two-dot chain line) is placed at an appropriate outdoor location near the bathroom. 1 is a bathtub, which is arranged in the bathroom. A suction port 2 for sucking bath water in the bathtub 1 and a discharge port 3 for discharging hot water into the bathtub 1 are provided near the lower end of the inner wall surface of the bathtub 1. 10 is a circulation circuit, both ends of which are
It is connected to the suction port 2 and the discharge port 3, and is arranged so that bath water in the bathtub 1 can be circulated in the main unit 100.

The circulation circuit 10 includes an outgoing pipe 10a downstream of a connection point 21 with a pipe 20 described later, and a connection point 21.
And a return pipe 10b on the more upstream side. A circulation pump 11 for circulating bath water in the bathtub 1 in the circulation circuit 10 is disposed in the return pipe 10b. In this example, the circulation pump 11 uses an electric pump of a type that pumps bath water by rotating an impeller in a housing.

On the upstream side of the circulation pump 11 of the return pipe 10b, there is provided a motor-operated valve 12 for communicating or blocking the path of the return pipe 10b. The motor-operated valve 12 is a motor-operated valve that slowly opens and closes a path by a servomotor or the like, and can reduce operating noise transmitted to a bathroom in which the bathtub 1 is arranged, compared to an electromagnetic valve that instantaneously opens and closes a path by a solenoid or the like. . A water level sensor 13 as pressure detection means is disposed upstream of the position where the motor-operated valve 12 is provided on the return pipe 10b, and pressure information in the return pipe 10b will be described later as water level information in the bathtub 1. The data is output to the control device 200.

On the other hand, an electric heater 14 serving as a heating means for heating bath water passing through the going pipe 10a is provided on the going pipe 10a.
Is provided. A flow switch 15 is provided on the upstream side of the electric heater 14 of the outgoing pipe 10a, and a control device 20 which will be described later determines whether or not the bath water flows in the outgoing pipe 10a.
0 is output. At a connection point 21 between the circulation circuit 10 and a pipe 20 described later, a water temperature sensor 16 serving as a water temperature detection unit is provided, and temperature information of the connection point 21, that is, water or pipe in the circulation circuit 10 is provided. 2
The temperature information of the water flowing into the outgoing pipe 10a from 0 is output to the control device 200 described later.

Reference numeral 30 denotes a hot water storage tank, which is heated by a heat pump device or an electric heater (not shown) and stores therein high-temperature hot water supplied from an introduction pipe 31. In this example, the hot water storage tank 30 is for storing the high-temperature hot water supplied from the introduction pipe 31 inside. However, tap water or the like is introduced from the introduction pipe 31 and heated by an electric heater or the like in the hot water storage tank 30. It may be stored as hot water at high temperatures.

Numeral 34 denotes a temperature control valve, which is arranged at a junction of an outlet pipe 32 for leading hot water from the hot water storage tank 30 and a tap water inlet pipe 33 for introducing tap water. The temperature control valve 34 can adjust the mixing ratio of hot water and tap water by adjusting the opening area ratio.
Configurations 30 to 34 are hot water supply means in the present embodiment.

The outlet side of the temperature control valve 34 and the connection point 21 of the circulation circuit 10 are connected by a pipe 20 which is a hot water supply passage.
The pipe 20 is provided with an electromagnetic valve 22 which is an opening / closing means for communicating or blocking this path. Solenoid valve 2 for pipe 20
A flow rate counter 23 is disposed between the temperature control valve 2 and the temperature control valve 34, and outputs information on the flow rate of hot water flowing through the pipe 20 to a control device 200 described later. A check valve 24 is provided between the solenoid valve 22 and the connection point 21 of the pipe 20.
Is provided, and the hot water supply pressure of the pipe 20 is reduced by the circulation circuit 10.
If the bath water is lower than the pressure of the bath water circulating in the
0 does not flow backward.

Reference numeral 70 denotes an outside air temperature sensor (temperature sensor) which is an outside air temperature detecting means for detecting the outside air temperature, and is arranged at an appropriate position in the main body unit 100 which is arranged outdoors so as to easily detect the outside air temperature. The outside air temperature sensor 70 outputs outside air temperature information to a control device 200 described later.

In FIG. 1, reference numeral 200 denotes a control device as control means, which includes pressure information from the water level sensor 13, presence / absence of flow of bath water from the flow switch 15, and a water temperature sensor 16.
Based on the temperature information from the controller, the flow rate information from the flow counter 23, the temperature information from the outside air temperature sensor 70, the signal from the hot water switch 41 provided on the operation panel 40 arranged in the bathroom, etc. According to the circulation pump 1
1. It is configured to control the electric valve 12, the electric heater 14, the electromagnetic valve 22, and the temperature control valve 34.

Next, the operation of the bath water heater based on the above configuration will be described.

FIG. 2 is a flowchart showing the overall schematic control operation of the control device 200. As shown in FIG. 2, when power is supplied to the bath water heater, control device 200 performs automatic hot water filling automatic warming control based on a signal from hot water switch 41 of operation panel 40 or another switch (not shown). One of S11, hot water control S12, water supply control S13, and water supply control S14 is executed.

First, automatic hot water filling automatic heat retention control will be described. When an automatic filling switch (not shown) of the operation panel 40 is turned on and an ON signal is input to the control device 200,
The control device 200 executes an automatic hot water filling automatic heat retention control S11. The control device 200 first opens the electromagnetic valve 22, opens the electric valve 12, and stops the circulation pump 11.
At this time, the electric heater 14 is not energized. Thereby, the hot water in which the high-temperature hot water and the tap water are mixed by the temperature control valve 34 flows into the circulation circuit 10 from the connection point 21 via the pipe 20. At this time, the circulation pump 11 is not driven,
Since the motor-operated valve 12 is also open, the connection point 21
The warm water flowing into the circulation circuit 10 flows into the going pipe 10a and the returning pipe 10b.

The hot water flowing into the outgoing pipe 10a is discharged into the bathtub 1 from the discharge port 3, and the hot water flowing into the return pipe 10b passes through the stopped circulation pump 11, and is discharged from the suction port 2 into the bathtub 1. Discharge inside. Therefore, the hot water can be filled more quickly than when the hot water is filled only from the outgoing pipe 10a. At this time, control device 200 controls temperature control valve 34 based on a signal from a temperature setting switch (not shown) and temperature information from water temperature sensor 16 to adjust the mixing ratio of high-temperature hot water and tap water to suction. The temperature of the hot water discharged from the port 2 and the discharge port 3 is adjusted. Then, after filling the water to the set water level, the electromagnetic valve 22 is closed, and the filling is finished.

If the bathtub 1 is filled with water within the initial predetermined number of times (three times in this example), the control device 200 stops the circulation pump 11 and turns off the electric heater 14.
The motor-operated valve 12 is closed and the solenoid valve 22 is opened without energizing the solenoid valve. Thereby, the high-temperature hot water in the hot water storage tank 30 and the water supplied from the tap water inlet pipe 33 are mixed by the temperature control valve 34, and the hot water is discharged from the discharge port 3 into the bathtub 1 through the pipe 20 and the outgoing pipe 10 a. It is stretched.

Here, when the filling is in progress, the control device 200 controls the water level sensor 1 based on the flow rate information from the flow rate counter 23 and the pressure information from the water level sensor 13.
Reference water level data for calculating the water level in the bathtub 1 based on the pressure information from 3 and bath data (point data of the amount of supplied water with respect to the water level) are stored.

After the filling is completed, the control device 20
In the case of 0, the electric valve 12 is opened, the electromagnetic valve 22 is closed, and the circulation pump 11 is driven to circulate the bath water in the bathtub 1 in the circulation circuit 10. When the temperature detected by the water temperature sensor 16 is lower than the temperature set by a temperature setting switch (not shown), the electric heater 14 is energized to heat the bath water flowing in the circulation circuit 10. If the temperature detected by the water temperature sensor 16 is equal to or higher than the temperature of a temperature setting switch (not shown), the electric heater 14 is not energized.

Next, the hot water control will be described. When a hot water switch (not shown) of operation panel 40 is turned on and an ON signal is input to control device 200, control device 200 executes hot water control S12. The control device 200 first opens the electromagnetic valve 22, opens the electric valve 12, and stops the circulation pump 11. At this time, the electric heater 14 is not energized. As a result, the hot water in which the high-temperature hot water and the tap water are mixed by the temperature control valve 34 is supplied from the suction port 2 and the discharge port 3 to the bathtub 1 similarly to the automatic hot water filling after the initial predetermined number of times.
Discharge inside.

At this time, control device 200 controls temperature control valve 34 based on a signal from a temperature setting switch (not shown) and temperature information from water temperature sensor 16 to adjust the mixing ratio of hot water and tap water. Then, the temperature of the hot water discharged from the suction port 2 and the discharge port 3 is adjusted. Then, when a predetermined amount of hot water is discharged into the bathtub 1, the solenoid valve 22 is closed, and the hot water is terminated.

Next, the water supply control will be described. When a water switch (not shown) of the operation panel 40 is turned on and an ON signal is input to the control device 200, the control device 200 executes water control S13. The control device 200 first opens the electromagnetic valve 22, opens the electric valve 12, and stops the circulation pump 11. At this time, the electric heater 14 is not energized. Further, the temperature control valve 34 is controlled so that only tap water flows into the pipe 20. Thereby, the tap water is discharged from the suction port 2 and the discharge port 3 into the bathtub 1. When a predetermined amount of tap water is discharged into the bathtub 1, the electromagnetic valve 2
Close 2 and finish watering.

Next, the hot water control will be described with reference to FIGS. 1, 3 and 4. FIG. Here, FIG. 3 is a flowchart showing a schematic flow of the hot water supply control S14 shown in FIG.

When the hot water switch 41 of the operation panel 40 is turned on and an ON signal is input to the control device 200, the control device 200 executes hot water control S14 shown in FIG. FIG.
As shown in (1), the control device 200 first inputs information on the outside air temperature from the outside air temperature sensor 70 (step S10).
1). Next, the electromagnetic valve 22 is opened to allow hot water to flow into the pipe 20 (step S102). At this time, the electric valve 12 is opened, the circulation pump 11 is stopped, and the electric heater is not energized.

After the execution of step S102, the control of the temperature control valve 34 is executed according to the outside air temperature inputted in step S101 (step S103). At this time, the control device 200
Is a pipe 20 based on temperature information from the water temperature sensor 16.
From the hot water flowing into the circulation circuit 10 at the connection point 21 from
That is, the temperature of the hot water is detected. Then, the opening area ratio of the temperature control valve 34 is adjusted such that the detected temperature of the hot water becomes a value corresponding to the outside air temperature as shown in FIG.

According to this, as shown in FIG. 4, when the outside air temperature is -10 ° C. or less, the suction port 2 and the discharge port 3
The temperature of the hot water supplied from is about 80 ° C. The temperature of the hot water decreases as the external temperature increases from -10 ° C to 30 ° C, and the temperature decreases when the external temperature is 30 ° C or more. Is about 60 ° C.

The temperature of the hot water is controlled in the range of about 80 to about 60 ° C., because the temperature of the hot water in the hot water storage tank 30 fluctuates slightly even if the temperature of the hot water slightly fluctuates. This is because the maximum temperature of the hot water is approximately 80 ° C., and when the maximum temperature is 60 ° C. or less, the effect of increasing the temperature of the bath water in the bathtub 1 due to the hot water decreases. Therefore, for example, if the temperature of the hot water in the hot water storage tank 30 can be reliably maintained at 90 ° C. or higher, the maximum temperature of the hot water can be about 90 ° C., but compared with the case of about 80 ° C. In addition, the temperature of the bath water in the vicinity of the suction port 2 and the discharge port 3 in the bathtub 1 becomes high when hot water is supplied, and it is easy for the user to feel uncomfortable.

After controlling the temperature control valve 34 in step S103, it is determined whether or not the amount of hot water supplied into the bathtub 1 is 20 L or more based on the flow rate information from the flow rate counter 23 (step S104). When the hot water supply amount becomes 20 L or more, the electromagnetic valve 22 is closed (step S105),
The hot water control ends.

According to the above-described configuration and operation, when the outside air temperature is high, for example, in summer,
When the temperature of the hot water is low, for example, when the outside air temperature is low as in winter, the temperature of the hot water can be high. Therefore, the bath water in the vicinity of the discharge port 3 in the bathtub 1 does not become hot at a high outside temperature, and the frequency of hot water does not increase at a low outside temperature. In this way, it is possible to prevent the user from feeling uncomfortable or increasing the amount of hot water, and it is not necessary for the user to manually set the temperature of the hot water, so that the usability can be improved.

Further, a switch for setting the temperature of the hot water by the user is not required. The outside air temperature sensor 70
Is provided in the main unit 100 installed outdoors, so that the outside air temperature can be reliably detected.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS.

The second embodiment differs from the first embodiment in that an electric valve 80 is provided in the pipe 20 to control the flow rate of hot water as shown in FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 5 is a schematic diagram showing a schematic configuration of a bath water heater according to the second embodiment.

The temperature control valve 34 and the flow counter 23 of the pipe 20
A motor-operated valve 80, which is a flow rate adjusting means for adjusting the flow rate of the hot water flowing through the pipe 20, is disposed between the two. In this example, a motor-operated valve for adjusting the opening degree by a stepping motor or the like is used. The control device 200 is also configured to control the electric valve 80 based on various input signals and the like, and to adjust the opening of the electric valve 80.

Next, the operation of the bath water heater based on the above configuration will be described. The control device 200 fully opens the electric valve 80 when executing the automatic hot water filling automatic warming control S11, the hot water control S12, and the water filling control S13 shown in FIG.

FIG. 6 is a flowchart showing the flow of hot water supply control according to this embodiment. When the hot water switch 41 of the operation panel 40 is turned on and an ON signal is input to the control device 200, as shown in FIG. 6, the control device 200 first executes steps S101 to S103 as in the first embodiment. I do. After executing Step S103, next, hot water flow rate control is executed (Step S201).

At this time, the control device 200 controls the water temperature sensor 1
The opening degree of the motor-operated valve 80 is adjusted so that the flow rate of hot water flowing through the pipe 20 becomes a value as shown in FIG. 7 according to the hot water temperature detected based on the temperature information from 6.

According to this, as shown in FIG. 7, when the hot water temperature is 60 ° C., the amount of hot water supplied from the suction port 2 and the discharge port 3 into the bathtub 1 per hour is 20 L / hour.
min, the feed rate per hour of hot water decreases as the hot water temperature rises from 60 ° C to 80 ° C. When the hot water temperature is 80 ° C, the feed rate per hour of hot water is It will be 5 L / min.

When the hot water flow rate control is completed in step S201, as in the first embodiment, the flow proceeds to step S104.
Step S105 is executed to end the hot water supply control.

According to the above configuration and operation, the same effects as those of the first embodiment can be obtained. In addition to this, as the temperature of the hot water becomes higher, the speed of supplying hot water into the bathtub 1 can be reduced. Therefore, since a large amount of hot water is not supplied in a short time, the range in which the temperature of the bath water near the suction port 2 and the discharge port 3 in the bathtub 1 becomes high can be reduced. In this way, the user's discomfort can be further prevented.

(Other Embodiments) In each of the above embodiments, the control device 200 detects the outside air temperature based on the temperature information from the outside air temperature sensor 70 as the outside air temperature detecting means. 12 is opened, the electromagnetic valve 22 is closed, and the circulating pump 11 is operated to circulate the bath water in the bathtub 1 into the circulation circuit 10, and the temperature of the bath water circulated from the water temperature sensor 16 which is a bath water temperature detecting means. Information may be input, and the outside air temperature may be calculated based on the amount of decrease in the temperature of the bath water in a predetermined time. At this time,
The circulation circuit 10, the circulation pump 11, the water temperature sensor 16 and the control device 200 constitute an outside air temperature detecting means. According to this, it is not necessary to provide the outside air temperature sensor 70 which is a temperature sensor for directly detecting the outside air temperature.

In each of the above embodiments, the outside air temperature sensor 70 is provided inside the main unit 100, but may be provided outside the main unit 100.

In the second embodiment, when the control device 200 controls the hot water flow rate, the opening of the electric valve 80 provided in the pipe 20 is adjusted according to the hot water temperature. Alternatively, a plurality of solenoid valves as opening / closing means may be provided in parallel in the pipe 20, and the flow rate may be controlled by controlling the opening / closing of these solenoid valves.

For example, as shown in FIG.
In addition, an electromagnetic valve 81 that allows hot water of 15 L / min to pass in an open state and an electromagnetic valve 82 that allows hot water of 5 L / min to pass in an open state are provided in parallel. The opening and closing control may be performed to control the hot water flow rate as shown in FIG.

In the second embodiment, the control device 200 controls the flow rate of hot water in accordance with the primary relationship as shown in FIG. 7 according to the hot water temperature. If the relationship is such that the flow rate of the hot water decreases as the pressure rises, control may be performed in a secondary or higher order relationship, or control may be performed stepwise.

In the second embodiment, the solenoid valve 22 and the motor-operated valve 80 are provided on the pipe 20, the solenoid valve 22 communicates or shuts off the pipe 20, and the motor-operated valve 80 controls the flow rate. However, the flow rate may be controlled by the solenoid valve 80 without providing the solenoid valve 22, and the solenoid valve 80 may be fully closed when the pipe 20 is cut off.

In each of the above embodiments, the hot water is supplied for a predetermined amount in step S104, but may be supplied for a predetermined time (for example, two minutes).

In each of the above embodiments, the outgoing pipe 1
Although the electric heater 14 for heating the bath water circulating in the circulation circuit 10 is provided at 0a, other types of heating means such as a heater may be used as long as the bath water can be heated.

In each of the above embodiments, -10
Real values such as ° C, 30 ° C, and 20 L are examples, and can be set appropriately according to various characteristics of the bath water heater.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a schematic configuration of a bath water heater according to a first embodiment of the present invention.

FIG. 2 shows a control device 20 according to the first embodiment of the present invention.
11 is a flowchart showing an overall schematic control operation of a zero.

FIG. 3 is a control device 20 according to the first embodiment of the present invention.
It is a flowchart which shows the general hot water control operation of 0.

FIG. 4 is a diagram showing the relationship between the outside air temperature and the hot water temperature when controlling the hot water temperature in step S103 of FIG. 3;

FIG. 5 is a schematic diagram illustrating a schematic configuration of a bath water heater according to a second embodiment of the present invention.

FIG. 6 shows a control device 20 according to a second embodiment of the present invention.
It is a flowchart which shows the general hot water control operation of 0.

FIG. 7 is a diagram showing the relationship between the hot water temperature and the hot water flow when controlling the hot water flow in step S201 of FIG. 6;

FIG. 8A is a schematic diagram showing a schematic configuration of a main part of a bath water heater in another embodiment, and FIG.
FIG. 6 is a diagram showing a relationship between a hot water temperature and a hot water flow rate when controlling the hot water flow rate in the configuration of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bathtub 10 Circulation circuit 11 Circulation pump 12 Electric valve 16 Water temperature sensor (bath water temperature detection means) 22 Solenoid valve 34 Temperature control valve 40 Operation panel 41 Hot water switch 70 Outside air temperature sensor (Outside air temperature detection means, temperature sensor) 80 Electric valve 100 body unit 200 control device (control means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiji Miwa 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in Denso Corporation (Reference) 3L024 CC06 CC16 DD03 DD23 DD27 GG02 GG05 GG06 GG12 GG22 GG28 GG38 HH13 HH18 HH19 HH26 HH31

Claims (4)

[Claims] 1. A bath water heater for supplying temperature-controlled hot water into a bathtub (1), comprising: an outside air temperature detecting means (70) for detecting an outside air temperature; In the case of performing hot water supply, there is provided control means (200) for controlling the temperature of the hot water to be lowered as the external air temperature detected by the external air temperature detecting means (70) increases. Bath water heater. 2. The control device according to claim 1, wherein the controller controls the supply amount of the hot water to decrease per hour as the temperature of the hot water increases.
The bath water heater according to the above. 3. The outdoor temperature detecting means (70) is a temperature sensor provided outdoors.
Alternatively, the bath water heater according to claim 2. 4. The outside air temperature detecting means (10, 11, 1)
6, 200) has a bath temperature detecting means (16) for detecting the temperature of the bath water in the bathtub (1), and the amount of decrease in the temperature of the bath water in a predetermined time detected by the bath temperature detecting means (16). 3. The bath water heater according to claim 1, wherein the outside air temperature is detected based on the temperature.