JPH0765795B2 - Method and device for controlling temperature in bathroom - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for controlling temperature in a bathroom, and more particularly to a bathroom temperature suitable for use with a water heater or a water heating system having a hot water supply function for a bathtub in the bathroom. The present invention relates to a control method and device.

[0002]

2. Description of the Related Art Recently, even a water heater that uses gas or kerosene as a fuel exhibits excellent controllability with respect to the hot water supply function and the reheating function for the bathtub in the bathroom, and the safety measures are relatively low. Well-established items are beginning to appear on the market. This is partly due to the fact that the use of microcomputers has become commonplace in electronic control units used for hot water supply temperature control and other purposes. However, there is no conventional example in which the temperature in the bathroom is taken into consideration in consideration of the hot water supply device or the hot water supply system using the same.

[0003]

Generally speaking, in view of the temperature environment in the bathroom, it is common knowledge that winter is cold and summer is muggy. That is, since there was no conventional example that considered such points in consideration of the water heater, in winter it was necessary to endure the unbearable cold when entering the bathroom from the dressing room, In the summer, I had to go into the bathroom and open the windows. In view of this point, the present invention heats the inside of the bathroom by rational means in a situation where it is more comfortable to heat the inside of the bathroom in winter, and reduces the temperature in the bathroom during summer and the like. It is intended to provide a method and a device for ventilating the bathroom in a situation where it is considered more comfortable.

[0004]

In order to solve the above problems, the present invention first detects the temperature outside the bathroom, that is, the outside air temperature, and also detects the temperature inside the bathroom. Then, from the detected outside air temperature, a temperature that seems comfortable in the bathroom is obtained, and this is set as the set temperature, and the temperature in the bathroom is calculated from the set temperature and the detected actual temperature in the bathroom. It is determined whether heating in the bathroom or ventilation in the bathroom is necessary in order to approach the above set temperature. As a result of this judgment, it is recognized that heating is necessary, and when the combustion part provided in the water heater for supplying hot water to the bathtub in the bathroom is burning, the exhaust heat generated by the combustion part is involved. Guide at least part of the exhaust into the bathroom. The introduction of the exhaust gas into the bathroom is continued until the temperature in the bathroom falls within the allowable temperature difference range with respect to the set temperature. On the other hand, if it is determined that ventilation is required as a result of the above judgment, operate the exhaust fan until the temperature in the bathroom falls within the allowable temperature difference range for the set temperature, and ventilate the bathroom. To do. It should be noted that an intake fan can be used to guide at least a part of the exhaust heat of the water heater into the bathroom when heating is required, but in this case, an exhaust fan that can be rotated normally and reversely is used. When heating is required, the exhaust fan can be used as an intake fan by rotating the fan in the opposite direction to the ventilation. That is, if an intake / exhaust fan is provided and its rotation direction is reversed between heating and ventilation, one fan member will suffice. Further, according to another aspect of the present invention, even when the combustion part of the water heater is burning, when the heating in the bathroom is not required, the exhaust heat generated from the combustion part can be released to the external environment. like,
An exhaust path switching mechanism for selectively switching the exhaust path from the water heater is provided. On the contrary, when it is determined that heating in the bathroom is required, but when the combustion part of the water heater is not burning, as another aspect of the present invention, the temperature in the bathroom is an allowable temperature with respect to the set temperature. A step of operating a separately provided heater member to warm the outside air and then introducing it into the bathroom is added until the temperature falls within the difference range.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a flow chart showing an embodiment of a method for controlling the temperature inside a bathroom according to the present invention, and FIG. 3 is a structural example of a bathroom and a water heater to which the method is applied and their installation relationships. An example is shown. Although the water heater main body 1 is shown in FIG. 3, it may have the function of an existing water heater as it is, and it is almost the same as the conventional one except for additional components necessary for the present invention described later. The structure of is available. For example, having a combustion unit 2 inside, the gas supplied from a water supply path (not shown) is heated by a heat exchanger (not shown) using gas or kerosene as a fuel, and the water is supplied to the bathtub 11 provided in the bathroom 10. In addition to having the function of supplying hot water to the shower, it also has the function of supplying hot water to the shower, the function of supplying hot water to the kitchen or washroom through another faucet not shown, and the function of reheating the hot water in the bathtub 11. Well, these functions may be controlled by the electronic control unit 3, which nowadays usually comprises a microcomputer. In addition, the electronic control unit 3 is provided with various commands of the user,
For example, because it is necessary to accept the designation of hot water supply temperature and the designation of the reheating temperature for those that can be reheated, etc., it is installed in the operation device 5 called a remote control unit installed in the bathroom, kitchen, living room, etc. It is configured to determine whether or not each corresponding switch 7 ... Is operated. On the contrary, in some cases, the display unit 6 for visually displaying the current operation mode, the designated temperature, etc. to the user may be provided, and further convenience is pursued. It is not mandatory. Further, generally, in this type of water heater, in order to guarantee the completeness of combustion, the air amount to the combustion part is often adjusted by the fan 4, and even in this embodiment, such a water heater 1 is used. In consideration of the above, and as described later, the fan 4 is effectively used. However, when distinguishing the combustion amount or air amount adjusting fan 4 built in the water heater 1 from an intake / exhaust fan 12 which will be described later and which is provided for the present invention, this is simply referred to as a water heater fan 4. . Hereinafter, an example of a necessary mechanical structure portion and the like will also be described through an embodiment of the bathroom temperature control method of the present invention with reference to FIG.

For the electronic control unit 3 built in the water heater 1, a power switch included in the switches 7 attached to the operation unit 5 ... Or provided only in the water heater main body 1 When (not shown) is turned on, first, as shown in step 100 in FIG. 1, a temperature sensor (thermistor or the like) that detects the temperature of the external environment outside the bathroom 10, that is, the outside air temperature To is convenient. ) 8 temperature information is captured by the electronic controller 3. For this, of course, as already mentioned, it is possible to use microcomputers which are now more common to use. The same applies to the operation in each step described below. By taking in the outside temperature To, the actual outside temperature To at that time
Below, it can be determined how comfortable the temperature in the bathroom 10 is. In other words, the capture of the outside temperature To captures the seasonal information. Here, FIG.
As shown in the inside step 101, for the setting of the comfortable temperature Ts in the bathroom based on the outside air temperature To, for example, the following setting criteria can be adopted. Conditions: To ≥ 25 ° C; Ts = To -7 ° C Conditions: To ≤ 10 ° C; Ts = To + 5 ° C Conditions: 10 ° C <T _o <25 ° C; Ts = 18 ° C Of course, outside temperature According to To, the setting standard of the temperature Ts which is considered to be comfortable in the bathroom 10 is an arbitrary design and is not limited to the above, but in any case, the temperature Ts determined by a certain standard is set thereafter. Called temperature Ts.

If the set temperature Ts which is the desired temperature in the bathroom 10 is determined as described above in step 101 in FIG. 1, the electronic control unit 3 causes the bathroom 10 to operate in the next step 102. The actual temperature Ti in the bathroom is taken in through an internal bathroom temperature sensor (which can also be constituted by a thermistor or the like) 13 which is provided inside and detects the actual temperature Ti in the bathroom 10 at any given time. Then, step 103
Determines whether or not the user is required to control the temperature in the bathroom. This is because, for example, another switch for controlling the temperature in the bathroom is provided in the switches 7, etc. provided on the operating unit 5 ... This is because when the temperature control is not requested, the switch is turned off and an off command is issued to end the flow chart of FIG. On the contrary, when the command switch for controlling the temperature in the bathroom is turned on by the user and the temperature control in the bathroom to which the present invention is applied is expected, the electronic control unit 3 has the built-in controller. Microcomputer of next step 10
Moving to 4, the set temperature Ts set previously and the actual bathroom temperature
From Ti, determine whether heating is required to raise the actual temperature Ti in the bathroom, or conversely ventilation in the bathroom is needed to lower it. An electronic arithmetic circuit for such an operation can be substantially obtained as a substitute for hardware by a program for operating a microcomputer provided in the electronic control unit 3. Needless to say, in principle, when the actual temperature Ti in the bathroom 10 is lower than the set temperature Ts, it can be determined as heating, and when it is high, it can be determined as ventilation, but the allowable temperature difference range is also set for this. be able to. FIG. 2 schematically shows an example of such a case. For example, the above-mentioned conditions are often applied in the winter season, and if the outside air temperature To is 5 ° C., the set temperature Ts set as a comfortable and preferable temperature in the bathroom 10 is Ts = 10 (° C.). Becomes
On the other hand, when the outside temperature To is about 5 ° C, the actual temperature in the bathroom
Ti, though indoors, is often close to this. Here, it is assumed that Ti = 7 ° C., for example. Therefore, in such a case, the actual temperature Ti in the bathroom is set to the set temperature 10
It is desirable to bring it as close as possible to ℃. However, conversely, when the set temperature Ts is 10 ° C., the actual temperature Ti in the bathroom has not reached the set temperature Ts, but is still 9 ° C. or higher, for example.
If the temperature rises above about 0 ° C, it is considered that it is not necessary to force the bathroom temperature Ti to reach the set temperature of 10 ° C.
The user's experience also has a range of being acceptable at this level. Therefore, below the set temperature Ts,
For example, a value of about 1 ° C. is used as the allowable temperature difference α for heating.
The temperature can be set as (° C.), and in such a case, even if it is determined in step 104 described above that heating is necessary, the subsequent step 105
It is determined whether the actual temperature Ti in the bathroom is higher than the temperature obtained by subtracting the allowable temperature difference α from the set temperature Ts (Ts-α ≧ Ti?), And if it is lower, move to the next step 106. ,
If not, the process may return to step 102. However, in FIG. 1, steps 111 to 114 intervene on the return path from step 105 to step 102. However, as will be described later, this is due to intake and exhaust fans,
This is a step of turning off the heater and the water heater fan that are turned on in some cases, and is inserted here in order to simplify the program that realizes this flow chart.

A similar allowable temperature difference range can be set even during ventilation. For example, in summer or the like, the above-described conditions are often followed, and when the outside temperature To is 30 ° C., the set temperature Ts that is comfortable in the bathroom is 23 ° C. according to the conditional expression. At this time, the actual temperature Ti in the bathroom
For example, if there is 28 ℃, this can be set as much as possible.
It is better to approach Ts = 23 ° C. However, for example, when the actual temperature Ti in the bathroom is within the temperature difference range up to about β = 2 (° C) with respect to the set temperature Ts, or by the ventilation operation described later, the actual temperature Ti in the bathroom Ti When the air pressure has fallen within this range, it may be considered that new ventilation operation and further continuous ventilation operation are unnecessary. Therefore, a judgment step 202 relating to this can be added, but this will be described when the sequential operation described below has proceeded to the step 202. However, as a general concept, as shown in FIG. 2, the set temperature Ts when heating is required is lower than the set temperature Ts when ventilation is determined to be necessary, The value of the upper allowable temperature difference β with respect to the set temperature Ts when it is determined that ventilation is required is larger than the temperature difference α that determines the lower allowable temperature difference range with respect to the set temperature when it is determined that heating is required. become. In FIG. 2, for the sake of explanation, α and β are drawn almost the same (although it may be set to be the same, but the point is a design problem). In FIG. 2, the allowable temperature difference β for ventilation is shown even during heating, and the allowable temperature difference α for heating is shown during ventilation as well. As can be seen, the allowable temperature difference β for ventilation during heating is quite large,
Similarly, the allowable temperature difference α for heating during ventilation is set to be considerably large. The reason for this will also be described later. Of course, as shown in the previous conditions, the set temperature Ts = 1 even in general when responding to the spring or autumn seasons.
With respect to the heating or ventilation operation performed to match the actual temperature Ti in the bathroom to 8 ° C., it is possible to set appropriate allowable temperature difference ranges α and β on the upper side and the lower side of the set temperature.

If the actual temperature Ti in the bathroom is lower than the temperature obtained by subtracting the allowable temperature difference α for heating from the set temperature Ts in step 105 described above, in step 106. As shown, the exhaust door 1 used in this embodiment as the exhaust path switching mechanism.
4 (FIG. 3) is moved in the direction indicated by arrow f. That is, in this embodiment to which the present invention is applied, as an alteration to the existing hot water supply system, the exhaust gas accompanied by the exhaust heat from the combustion unit 2 built in the water heater main body 1 is discharged under the exhaust operation of the water heater fan 4. When the exhaust door 14 is in the position shown by the solid line in the figure, the exhaust path is directly discharged from the exhaust port 15 to the external environment, but when the exhaust door 14 is moved as shown by the arrow f, the surroundings of the bathroom 10 are taken. Through the second exhaust port 17 to the other exhaust passage 16. For convenience, this exhaust path 16 is named as the internal exhaust path 16 or simply as the internal path 16. On the other hand, in the middle of the internal exhaust path 16 leading to the second exhaust port 17, there is the intake / exhaust fan 12 rotatable in both the forward and reverse directions in this case. It is rotated in the direction of the intake operation as seen from the inside of the interior of the bathroom 10, so that at least a part of the air flow or the exhaust flow passing through the internal exhaust path 16 enters the bathroom 10 as indicated by the arrow f _i. Be guided.

After the intake / exhaust fan 12 is started to rotate for intake operation, in the case of this embodiment, the next step 1
At 08, it is determined whether or not the water heater is burning, or more precisely, whether or not the combustion unit 2 built in the water heater body 1 is burning. When the combustion part 2 of the water heater is burning, not only when hot water is supplied to the bathtub 11, but also when hot water is supplied to a shower or another faucet (not shown), and when it has a reheating function, the reheating is performed. There is. Here, the combustion part 2 of the water heater
When the engine is burning, the water heater fan 4 causes the exhaust gas generated by the combustion unit to generate exhaust gas with the internal exhaust path 16
Is provided to the intake side of the intake / exhaust fan 12 via at least a part thereof and is taken into the bathroom 10.
The internal temperature begins to rise due to exhaust heat, and the intended purpose of heating is achieved. Therefore, following the determination in step 108 that combustion in the water heater combustor is in progress, the process returns to the previous step 102, and thereafter, the above step group is sequentially repeated at a predetermined cycle. However, the internal exhaust path 16
In the middle of, the filter 18 may be provided at a position replaceable by the user in order to normalize the exhaust flow.

On the other hand, as a result of the judgment in the judgment step 108, when the combustion part of the water heater 1 is not burning, the routine proceeds to step 109 in this embodiment, and the heater 9 shown in FIG. 3 is turned on. It is said that The heater 9 is located in the middle of the internal exhaust path, and is generally of a type that receives supply of electric power to heat the surrounding airflow. As the heater 9 is turned on, in the present embodiment, the water heater fan 4 built in the water heater 1 is also turned on as shown in the following step 110. This streamlines the intake of outside air through the inside of the water heater 1 and increases the amount of air heated by the heater 9 per unit time. This is to increase the amount of warm air sent to the.

After this, as in the case where the combustion part 2 of the water heater 1 is in the process of combustion, the process returns to step 102, and thereafter, the steps up to this point are sequentially repeated, but heating is performed by the exhaust heat of the combustion part 2. In the case of heating with the heater 9 as well, the inside of the bathroom 10 will be sufficiently warmed up until the actual temperature Ti in the bathroom reaches the temperature above the allowable temperature difference range α below the set temperature Ts. It is possible. Then, in the determination step 105 regarding this, it is determined that Ts−α ≧ Ti is not satisfied, that is, Ts−α <Ti, and the result moves to step 111, and the intake / exhaust fan 12 is turned off first. It is said that Next, at step 112, it is determined whether the combustion unit 2 of the water heater 1 is burning.
If the heater 9 is not in the combustion state, that is, if the heater 9 is used as the heating source, an OFF command is given to the heater 9 as shown in step 113, and the heater 9 is shown in the following step 114. As described above, the water heater fan 4, which was forcibly turned even though it is not burning, is also stopped, and the process returns to step 102. When the combustion unit 2 of the water heater 1 is burning in step 112, that is, when the exhaust heat of the combustion unit 2 is used as a heating source, there is no need to issue an OFF command to the heater 9, Further, since it is not good to stop the water heater fan 4 of the water heater 1 which is originally in the combustion mode, the process directly proceeds to step 102.
Then, if heating is required again, step 1
It is obvious that the same operation as described above occurs except when the user instructs that the temperature in the bathroom is not required to be controlled, as indicated by 03.

On the other hand, the ventilation operation has the following procedure. As in the previous case, if the actual temperature Ti in the bathroom taken in in step 102 is higher than the set temperature Ts set in step 101 according to the previous conditions 1 to 3, it is determined in step 103. As long as the user expects the temperature control in the bathroom, in principle, it is determined in step 104 that ventilation should be performed. Of course, when such a judgment is made, it is common for conditions and conditions, but in special cases, even when the outside temperature To is low like conditions, the actual temperature Ti in the bathroom is
If it is considerably higher, it may be judged as ventilation as well. In any case, when it is determined in step 104 that ventilation should be performed, the exhaust door 14 provided as the exhaust path switching mechanism in this embodiment is indicated by the solid line in FIG. 3 as shown in step 200 following this. It is attached to the position. Therefore, temporarily at this time, the combustion unit 2 of the water heater 1
Even during combustion, the exhaust gas accompanied by exhaust heat from the combustion unit 2 is immediately discharged directly to the external environment from the exhaust port 15 without passing through the internal exhaust path 16 that goes around the bathroom 10. That is, it is possible to prevent unnecessary heat from being introduced into the bathroom 10. In the subsequent step 201,
Rotate the intake / exhaust fan 12 in the opposite direction to that during heating, and press the arrow
As indicated by f _O , hot air or warm air staying in the bathroom 10 is exhausted from the second exhaust port 17 to the external environment. In the next step 202, it is judged whether or not the actual temperature Ti in the bathroom has fallen to within a temperature range in which the upper allowable temperature difference β with respect to the set temperature Ts is added, and it is still within that range. If not, return to step 102,
The steps up to this point are sequentially continued. On the other hand, as a result of continued ventilation, when the actual temperature Ti in the bathroom falls within the allowable temperature difference range, it is determined in step 202 that Ts + β ≧ Ti, and as shown in the following step 203, The intake / exhaust fan 12 is stopped, and the process returns to step 102 to continue monitoring the temperature in the bathroom. It should be noted that, as represented by the conditions, in spring or autumn, as long as the user desires to control the temperature in the bathroom, a system that temporally follows the method of the present invention is in a heating mode in some cases. Or, in some cases, ventilation mode. This is clear from the above sequence.

As a general rule, when heating is required and when ventilation is required, lower and upper allowable temperature differences α and β with respect to the set temperature Ts under the respective conditions.
However, it will no longer be appreciated that it may be different from each other as shown in FIG. For example, as a general rule, when it is determined to be heating and the exhaust heat of the water heater combustor 2 or the air heated by the heater 9 is taken into the bathroom 10, as a special case, then the set temperature Ts is exceeded. Even when the temperature Ti in the bathroom is reached, since the outside air temperature To and the set temperature Ts itself corresponding to this are low in the first place, it is rare that the temperature rises enough to cause ventilation operation. There is no need for that. Therefore, in this case, β may be set to be considerably large. On the contrary, in principle, the allowable temperature difference α on the lower side with respect to the set temperature Ts when the ventilation mode is expected to be set may be considerably large. However, as mentioned above, since this setting is an arbitrary design, it is possible to include the case where α = β is set.

Further, those skilled in the art can think of a number of alternative embodiments to the illustrated embodiment of the present invention, and appropriate replacement of steps and the like can be freely performed depending on a program to be constructed. Regarding the mechanical structure, in the illustrated embodiment, a fan member capable of rotating in the normal and reverse directions is used to form the intake / exhaust fan 12, which serves as both the intake fan and the exhaust fan. However, in principle, each fan is a dedicated fan. Is also good. Further, the fan 4 with a built-in water heater is also effectively used for efficient heating, but it is not always necessary. On the contrary, if a sufficient exhaust flow is expected even with the fan 4 provided in the water heater 1 and an exhaust path is constructed so that at least a part of the exhaust flow is guided into the bathroom 10, a new intake fan is provided. It is not necessary to replace the illustrated intake / exhaust fan 12 with only the exhaust fan. The exhaust path switching mechanism was also constructed to include the exhaust door 14 in the case of the illustrated embodiment, but since it is merely a mechanical structural device, those skilled in the art can use any suitable structure.
Other switching mechanisms can also be assembled.

[0016]

According to the present invention, the need for heating or ventilation is automatically determined by the outside air temperature and the actual temperature in the bathroom, and the temperature in the bathroom is automatically adjusted to a temperature at which the user feels comfortable. can do. As soon as you enter the bathroom, you are less likely to feel cold in the winter, and you can save yourself the trouble of opening a ventilation window immediately in summer, and you can pursue comfort. Moreover, since the energy source required for heating is the exhaust heat generated by this combustion section at least when the combustion section of the water heater is burning, it is extremely rational and has an energy saving effect. Even during ventilation, the exhaust fan is simply rotated, so that a large amount of power need not be used.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating an example of a temperature control method in a bathroom according to the present invention with a flow chart.

FIG. 2 is an explanatory diagram of a temperature relationship when an allowable temperature difference is provided with respect to a set temperature.

FIG. 3 is a schematic configuration diagram of equipment and the like required to realize an embodiment of the temperature control method in the bathroom of the present invention.

[Explanation of symbols]

 1 Hot Water Heater or Its Main Body 2 Combustion Part in Hot Water Heater 3 Electronic Control Device 4 Fan Equipped in Hot Water Heater 8 Outdoor Air Temperature Detection Sensor 9 Heater 10 Bathroom 11 Bathtub 12 Intake and Exhaust Fan 13 Bathroom Temperature Detection Sensor 14 Exhaust Door 15 Direct exhaust port 16 Internal exhaust path 17 Second exhaust port

Claims (9)

[Claims] 1. A method for controlling the temperature in a bathroom by using a water heater having a combustion part and capable of supplying hot water to a bathtub in the bathroom; Detecting the temperature in the bathroom; determining a temperature that seems comfortable in the bathroom from the detected outside air temperature and setting the temperature as a set temperature; the set temperature and the detected temperature in the bathroom From the step of determining whether heating in the bathroom or ventilation in the bathroom is necessary to bring the temperature in the bathroom close to the set temperature;
When it is recognized that heating is required and the combustion section of the water heater is burning, the combustion section is kept until the temperature in the bathroom falls within the allowable temperature difference range with respect to the set temperature. Directing at least a part of the exhaust gas with exhaust heat from the inside of the bathroom; if the result of the above judgment is that ventilation is required, the temperature in the bathroom is higher than the set temperature. Operate the exhaust fan until it is within the allowable temperature difference range,
A method of controlling temperature in a bathroom, the method comprising: ventilating the bathroom. 2. The method according to claim 1, wherein an intake fan is used as a means for guiding at least a part of the exhaust gas accompanied by exhaust heat from the combustion section into the bathroom. . 3. The method according to claim 2, wherein a forward / reverse rotatable fan is used as the exhaust fan; in the step of heating the bathroom, the exhaust fan is reversed to serve as the intake fan. Using. 4. A method as claimed in claim 1, 2 or 3; wherein the heating is not required and the exhaust from the combustion section of the water heater is during combustion. Closing an exhaust path for guiding at least a part of the exhaust gas into the bathroom, and directly discharging the exhaust gas to an external environment outside the bathroom. 5. The method according to claim 2, 3 or 4, wherein the temperature in the bathroom is maintained when the heating section of the water heater is not burning even when the heating is required. The method further comprises the step of introducing at least a part of the outside air warmed by a separately provided heater member into the bathroom by the intake fan until the temperature falls within an allowable temperature difference range with respect to the set temperature. Method. 6. A device for controlling the temperature inside a bathroom by using a water heater having a combustion part and capable of supplying hot water to a bathtub inside the bathroom; detecting an outside air temperature outside the bathroom. An outside air temperature detecting sensor; a bathroom temperature detecting sensor for detecting the temperature inside the bathroom; a temperature that is considered comfortable in the bathroom is obtained from the detected outside air temperature to obtain a set temperature, and the set temperature , An electronic device for judging from the detected temperature in the bathroom whether heating in the bathroom or ventilation in the bathroom is necessary to bring the temperature in the bathroom close to the set temperature. As a result of the judgment by the electronic calculation circuit, it is recognized that heating is required, and when the combustion part of the water heater is burning, the temperature in the bathroom is the set temperature. Until within the allowable temperature difference range for
An intake fan that guides at least a part of exhaust gas accompanied by exhaust heat from the combustion section into the bathroom; and when it is determined that ventilation in the bathroom is required as a result of the determination by the electronic arithmetic circuit, A temperature control device in the bathroom, comprising: an exhaust fan that ventilates the bathroom until the temperature in the bathroom falls within an allowable temperature difference range with respect to the set temperature. 7. The apparatus according to claim 6, wherein the intake fan and the exhaust fan are the same fan member,
However, the fan member is capable of rotating in the normal and reverse directions, and the rotation direction is opposite between the intake operation for heating the bathroom and the exhaust operation for ventilation in the bathroom. A device characterized by: 8. The apparatus according to claim 6 or 7, wherein at least the exhaust gas from the combustion unit is not required, and when the combustion unit of the water heater is in combustion. A device for closing the exhaust path for guiding a part of the exhaust gas into the bathroom, and having an exhaust path switching mechanism for directly discharging the exhaust gas to an external environment outside the bathroom. 9. The device according to claim 6, 7 or 8, wherein the heater member warms the outside air even when the heating is required, when the combustion part of the water heater is not in combustion. The intake fan guides at least part of the outside air warmed by the heater member into the bathroom until the temperature in the bathroom falls within an allowable temperature difference range with respect to the set temperature. A device.