Bath water heater

Abstract

To provide a bath water heater capable of preventing a hot water temperature in a bathtub from becoming high and capable of reducing waste energy.SOLUTION: A bath water heater (1) includes: a hot water filling passage (25) for filling hot water to a bathtub (3); a reheating passage (28) for heating hot water in the bathtub; water level detection means (29) for the bathtub; temperature detection means (30) for the hot water in the bathtub; and control means (20) for controlling a bath automatic operation for maintaining a set water level by filling hot water to the bathtub until reaching the set water level at a preset set temperature and maintaining the set temperature through reheating. On the basis of fluctuation of the water level in the bathtub, entering and leaving the bathtub are detected, and when the set temperature is changed to rise during the bath automatic operation, reheating is started in order to reach the set temperature after the change. When leaving the bathtub is detected in the middle of reheating in order to reach the set temperature after the change, the control means finishes the reheating and changes again the set temperature to a temperature of the hot water in the bathtub when the reheating is finished.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bath water supply device configured to heat city water and pour it into a bathtub, and to reheat the bath water in the bathtub.

Background Art

[0002] Conventionally, a bath water supply device having a function of automatic bath operation has been used, in which a preset temperature and a preset water level are set for a bathtub, hot water is poured into the bathtub at the preset temperature until the preset water level, and the water level and the bath water temperature in the bathtub are maintained by pouring hot water and reheating. Since the water level and the bath water temperature in the bathtub are automatically maintained, it is possible to take a comfortable bath even after a certain period of time has passed since the hot water was poured, or when a plurality of users take baths in turn.

[0003] The bath water supply device can set the time (period) of automatic bath operation, and can also be set to perform only hot water pouring. For example, in Patent Document 1, when it is set to perform only hot water pouring, after pouring hot water up to the set water level so that the temperature of the bath water in the bathtub at the end of hot water pouring becomes the set temperature, reheating is performed up to the set temperature. A bath water supply device is described. Reheating when the temperature of the bath water drops after completion of hot water pouring will be performed by the operation of the user.

[0004] In addition, some users may increase the set temperature to the high temperature side during automatic bath operation and take a bath by raising the temperature of the bath water in the bathtub by reheating. Since the temperature of the bath water in the bathtub is changed to the high temperature side, for example, in Patent Document 2, when the bath water in the bathtub is higher than the reference temperature, when it is detected that a user enters the bathroom, a bath water supply device that notifies from a bathroom remote control that the bath water is at a high temperature and prompts attention is described.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0006] In the reheating of the bathtub water heater disclosed in Patent Documents 1 and 2, regardless of whether the user is taking a bath or not, the reheating is performed until the water temperature in the bathtub reaches the set temperature. Therefore, for example, a user taking a bath may increase the set temperature by several degrees Celsius for quick warming and perform reheating, and before the water temperature reaches the changed set temperature, the body gets warm and the user gets out of the bathtub, and it is assumed that the water in the bathtub becomes as hot as the changed set temperature.

[0007] In such a case, simply giving a notice prompting attention to the high temperature as in Patent Document 2 may cause, for example, the elderly or children to accidentally take a bath. Also, a large amount of energy will be used for reheating to maintain the water temperature in the bathtub at the changed set temperature. Moreover, since the water temperature in the bathtub is high, in order for the next user taking a bath to adjust the temperature to the desired temperature, for example, cold water is put into the bathtub to lower the temperature and then the user takes a bath, and the energy for reheating is wasted.

[0008] Therefore, an object of the present invention is to provide a bathtub water heater that can prevent the water temperature in the bathtub from becoming high and reduce wasted energy.

MEANS FOR SOLVING THE PROBLEMS

[0009] The bathtub water supply and heating device according to the invention of claim 1 includes a water pouring passage for pouring heated hot water into the bathtub, a supplementary heating passage for heating the hot water in the bathtub, a water level detection means for detecting the water level of the bathtub, a temperature detection means for detecting the temperature of the hot water in the bathtub, and control means for controlling an automatic bathtub operation to pour water into the bathtub until a set water level is reached at a preset set temperature, maintain the set water level, and perform supplementary heating when the temperature of the hot water in the bathtub drops to maintain the set temperature. The control means detects bathing and leaving the bath based on fluctuations in the water level of the bathtub, and in the bathtub water supply and heating device that performs supplementary heating so as to reach the changed set temperature when the set temperature is increased and changed during the automatic bathtub operation, when the control means detects leaving the bath during the supplementary heating due to the increase and change of the set temperature in the state where bathing has been detected, the supplementary heating is terminated halfway, and the set temperature is re-changed to the temperature of the hot water in the bathtub at the end of the supplementary heating.

[0010] According to the above configuration, when the set temperature is increased and changed during the automatic bathtub operation, the bathtub water supply and heating device performs supplementary heating until the changed set temperature is reached. Then, during the automatic bathtub operation, when leaving the bath is detected during the supplementary heating due to the increase and change of the set temperature in the state where bathing has been detected, the supplementary heating is terminated halfway even if the changed set temperature has not been reached. Moreover, the set temperature is re-changed to the temperature of the hot water in the bathtub at the end of this supplementary heating. Therefore, since the temperature of the hot water in the bathtub is maintained at a re-changed set temperature lower than the set temperature whose increase has been changed during the automatic bathtub operation, it is possible to prevent the temperature of the bathtub from becoming too high and reduce the wasted energy.

[0011] The bathtub water supply and heating device according to the invention of claim 2 has, in the invention of claim 1, notification means for notifying information regarding the automatic bathtub operation, and when the temperature of the hot water in the bathtub becomes equal to or higher than a preset caution temperature due to the supplementary heating accompanying the increase and change of the set temperature, the control means notifies high-temperature caution information for the bathtub by the notification means. According to the above configuration, additional heating is executed as the set temperature is increased, and when the hot water temperature in the bathtub becomes equal to or higher than a preset warning temperature, hot bath high temperature warning information is notified to prompt attention to the high temperature during bathing. Therefore, when the set temperature is increased before bathing, the user can be notified that the hot water in the bathtub is at a high temperature, and the user can be prompted to pay attention not to accidentally take a bath in the high-temperature hot water. In addition, the user during bathing can be prompted to pay attention to the high-temperature hot water to prevent bathing accidents.

[0012] The bathtub water supply device according to the invention of claim 3, in the invention of claim 1 or 2, further comprises an entry detection means for detecting the entry of a person into the bathroom and a notification means for notifying information related to the automatic operation of the bathtub in the bathroom, and when the entry detection means detects the entry of a person, if the hot water temperature in the bathtub is equal to or higher than a preset warning temperature, the control means is characterized in that the hot bath high temperature warning information is notified by the notification means. According to the above configuration, additional heating is executed as the set temperature is increased, and when the hot water temperature in the bathtub becomes equal to or higher than a preset warning temperature, if it is detected that a user has entered the bathroom, the user who has entered is notified of the hot bath high temperature warning information to prompt attention to the high temperature during bathing. Therefore, the user immediately before bathing can be notified that the hot water in the bathtub is at a high temperature, and the user can be prompted to pay attention not to accidentally take a bath in the high-temperature hot water.

Advantages of the Invention

[0013] According to the bathtub water supply device of the present invention, it is possible to prevent the hot water temperature in the bathtub from becoming high and reduce the wasted energy.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0015] Hereinafter, embodiments for carrying out the present invention will be described based on examples.

Example

[0016] First, the configuration of the bathtub water heater 1 will be described based on FIG. 1. The bathtub water heater 1 is a combustion type water heater that heats the city water supplied as shown by arrow W with the combustion heat of fuel gas and supplies the hot water adjusted to a predetermined temperature to the outside as shown by arrow HW. However, it may be a water heater having other heat source machines such as a heat pump type heat source machine. This bathtub water heater 1 performs a hot water supply operation of supplying hot water at a preset hot water supply set temperature. Further, the bathtub water heater 1 performs a water filling operation of pouring hot water at a preset bathtub set temperature into the bathtub 3 up to a preset set water level, and performs a reheating operation of heating the hot water in the bathtub 3 to the bathtub set temperature and returning it to the bathtub 3.

[0017] The bathtub water heater 1 includes a fuel gas supply unit 11, a blower fan 12 that supplies combustion air, a water heating burner 13 and a bathtub burner 14 that burn fuel gas, and a water heating heat exchanger 15 that uses the heat of the high-temperature combustion gas generated by combustion to heat the city water and a bathtub heat exchanger 16 that heats the hot water in the bathtub 3. A water supply flow rate sensor 18 for detecting the flow rate of the city water is disposed in a water supply passage 17 that supplies the city water to the water heating heat exchanger 15. A distribution valve 19 whose distribution ratio can be adjusted is disposed upstream of the water supply flow rate sensor 18.

[0018] In order to control various operations by controlling the distribution ratio of the distribution valve 19 based on the detected flow rate of the water supply flow rate sensor 18 and the like, and the combustion control of the water heating burner 13, etc., a control unit 20 (control means) is provided in the bathtub water heater 1. Further, in order to neutralize and discharge the acidic condensed water in which the moisture in the combustion gas has condensed in the water heating heat exchanger 15 and the bathtub heat exchanger 16, a neutralizer 21 containing a neutralizing agent is equipped.

[0019] When the water supply flow rate sensor 18 detects a flow rate equal to or higher than a preset minimum operating flow rate, the control unit 20 causes the hot water burner 13 to burn and heats the make-up water with the hot water heat exchanger 15. This heated hot water is supplied to the hot water outlet passage 22, and is mixed with the make-up water from the water supply bypass passage 23 branched from the water supply passage 17 and connected to the hot water outlet passage 22 at the distribution valve 19, and the temperature is adjusted.

[0020] When the supply destination of the hot water is, for example, a hot water tap (not shown), the hot water adjusted to the hot water set temperature is supplied. When the supply destination of the hot water is the bathtub 3, the hot water adjusted to the bathtub set temperature is poured through the pouring passage 25 provided with the pouring valve 24. The pouring flow rate into the bathtub 3 is detected by a pouring flow rate sensor 26 disposed upstream of the pouring valve 24. The control unit 20 calculates the pouring amount poured into the bathtub 3 based on this pouring flow rate and the pouring time.

[0021] A reheating passage 28 equipped with a bathtub pump 27 is connected to the bathtub heat exchanger 16 to circulate the hot water in the bathtub 3. The control unit 20 controls the reheating operation of heating the hot water in the bathtub 3 flowing through the reheating passage 28 with the bathtub heat exchanger 16 and returning it to the bathtub 3 by driving the bathtub pump 27 and causing the bathtub burner 14 to burn.

[0022] The pouring passage 25 is connected to the reheating passage 28 via the bathtub pump 27. When pouring, the pouring valve 24 is opened, and for example, the hot water adjusted to the bathtub set temperature is poured from the pouring passage 25 into the bathtub 3 through the reheating passage 28.

[0023] In the hot water supply passage 25, a water level sensor 29 (water level detection means) for detecting the water level of the bathtub 3 by water pressure is disposed. The control unit 20 detects bathing and leaving the bath based on the fluctuation of the water level in the bathtub 3. On the downstream side of the bath pump 27 in the reheating passage 28, a bath temperature sensor 30 (temperature detection means) for detecting the hot water temperature of the bathtub 3 is disposed. The hot water temperature of the bathtub 3 is detected in a state where the bath pump 27 is driven to circulate the hot water in the bathtub 3 through the reheating passage 28. Incidentally, the water level sensor 29 may be disposed in the reheating passage 28.

[0024] The bath water supply device 1 has an operation terminal for performing start operation of reheating operation, various setting operations such as hot water supply set temperature, bathtub set temperature, set water level, etc. As this operation terminal, for example, a bathroom remote controller 4 installed in the bathroom and a kitchen remote controller 5 installed in the kitchen, for example, are communicatively connected to the control unit 20.

[0025] The bathroom remote controller 4 and the kitchen remote controller 5 are equipped with display units 4a, 5a for displaying setting information related to various operations and the like, and voice output units 4b, 5b in addition to a plurality of operation buttons. Further, the bathroom remote controller 4 is equipped with a human sensor 4c for detecting a user in the bathroom, and can detect entry into and exit from the bathroom.

[0026] Next, the automatic bath operation of the bath water supply device 1 will be described based on the flowcharts of FIGS. 2, 3, and 4. Si (i = 1, 2,...) in the figure represents steps. When the start operation of the automatic bath operation is performed from the operation terminal, the control unit 20 starts the automatic bath operation. In the automatic bath operation, hot water is supplied to the bathtub 3 until the set water level is reached at the preset bath set temperature, this set water level is maintained, and when the hot water temperature of the bathtub 3 drops, reheating is performed to maintain the bath set temperature.

[0027] When the automatic operation of the bath starts, first, in S1 of FIG. 2, bath preparation is performed to fill the bathtub 3 with hot water. When the bath preparation starts, as shown in FIG. 3, the preset set water level and bath set temperature (hereinafter referred to as the set temperature) of the bathtub 3 are acquired in S11, and the process proceeds to S12. Then, in S12, the preparation water level is set, and the process proceeds to S13. As shown in FIG. 1, the preparation water level (WLp) of the bathtub 3 is a water level lower than the set water level (WLs), for example, 20% lower than the set water level. Incidentally, for example, during the trial operation of the bath water supply device 1, the control unit 20 learns the relationship between the hot water injection amount and the water level in the bathtub 3, or the relationship between the hot water injection amount and the water level is set in the control unit 20.

[0028] Next, in S13 of FIG. 3, the injection of hot water at the set temperature is started, and the process proceeds to S14. Then, in S14, based on the hot water injection amount injected into the bathtub 3 or the detected water level of the water level sensor 29, it is determined whether the preparation water level has been reached. If the determination in S14 is No, the hot water injection is continued and the process returns to S14. If the determination in S14 is Yes, the process proceeds to S15.

[0029] Next, in S15, the hot water injection is stopped, and the process proceeds to S16. In S16, it is notified that the bath preparation is completed, and the process proceeds to S17. For example, the completion of the bath preparation is notified to the user by the display on the display units 4a and 5a of the bathroom remote control 4 and the kitchen remote control 5, and the sound output from the sound output units 4b and 5b. Then, in S17, the remaining hot water injection amount is calculated, and the process proceeds to S18. The remaining hot water injection amount is the amount of hot water corresponding to the difference between the set water level and the preparation water level (WLs - WLp).

[0030] Next, in S18, based on the change in the water level of the bathtub 3, it is determined whether bathing in the bathtub 3 has been detected. Since the water level in the bathtub 3 rises due to bathing, it is determined that bathing has been detected when the water level detected by the water level sensor 29 becomes, for example, a certain level higher than the preparation water level. If the determination in S18 is No, the process returns to S18. If the determination in S18 is Yes, the process proceeds to S19. In S19, the remaining hot water injection amount is injected to complete the bath preparation and return.

[0031] When the bath preparation is completed, the process proceeds to S2 in FIG. 2, and at S2, the water level and hot water temperature in the bathtub 3 are maintained. When this water level and temperature maintenance is started, as shown in FIG. 4, at S21, the water level and hot water temperature in the bathtub 3 are acquired and the process proceeds to S22, where it is determined whether or not bathing in the bathtub 3 is being detected. Since the water level in the bathtub 3 rises due to the user's bathing, when the detected water level of the water level sensor 29 is, for example, a certain degree higher than the set water level, it can be determined that the user is bathing.

[0032] If the user is not bathing and the determination at S22 is No, the process proceeds to S23, where it is determined whether or not the water level in the bathtub 3 has dropped by γ or more from the set water level. γ can be set as appropriate, and is set to, for example, 1 cm.

[0033] If the determination at S23 is Yes, the process proceeds to S24, where the maintenance amount required to return to and maintain the set water level is calculated, and the process proceeds to S25. Then, at S25, pouring of the calculated maintenance amount is performed with hot water at the set temperature, and the process proceeds to S26. On the other hand, if the determination at S23 is No, the process proceeds to S26 without pouring hot water.

[0034] Next, at S26, it is determined whether or not the hot water temperature in the bathtub 3 has dropped by δ or more from the set temperature. δ can be set as appropriate, and is set to, for example, 1 °C. If the determination at S26 is Yes, the process proceeds to S27, where reheating is started and the process proceeds to S28. Then, at S28, the hot water temperature in the bathtub 3 is acquired and the process proceeds to S29, where it is determined whether or not this hot water temperature is equal to or higher than a caution temperature preset for safety. The caution temperature is set higher than the temperature usually used for bathing, and is, for example, 45 °C.

[0035] If the determination in S29 is Yes, proceed to S30, and in S30, determine whether the high bath temperature caution information has not been notified. If the determination in S30 is Yes, proceed to S31, and in S31, notify the high bath temperature caution information and proceed to S32. This high bath temperature caution information is notified by the display and voice output of the bathroom remote control 4 and the kitchen remote control 5. On the other hand, if the determination in S29 is No, proceed to S32 without notifying the high bath temperature caution information, and if the determination in S30 is No, proceed to S32 without repeating the notification. Note that the high bath temperature caution information is erased when the hot water temperature in the bathtub 3 drops below the caution temperature, and can also be erased by operating the operation terminal.

[0036] Next, in S32, determine whether the hot water temperature in the bathtub 3 has reached or exceeded the set temperature. If the determination in S32 is No, continue the afterburner and return to S28. If the determination in S32 is Yes, proceed to S33, and in S33, end the afterburner and end the water level and temperature maintenance, and return.

[0037] On the other hand, if the detection of bathing results in a Yes determination in S22, proceed to S34, and in S34, determine whether the hot water temperature in the bathtub 3 has dropped by δ or more from the set temperature. Since the water level in the bathtub 3 rises due to the user's bathing and it is impossible to judge a water level drop, the hot water temperature is maintained without pouring water. If the determination in S34 is No, since afterburner is not necessary, end the water level and temperature maintenance and return. If the determination in S34 is Yes, proceed to S35, and in S35, start the afterburner and proceed to S36.

[0038] Next, in S36, determine whether bathing is detected based on the change in the water level in the bathtub 3. If bathing continues and the determination in S36 is Yes, proceed to S37, and in S37, obtain the hot water temperature in the bathtub 3 and proceed to S38. Then, in S38, determine whether this hot water temperature is equal to or higher than a preset caution temperature. If the determination in S38 is Yes, proceed to S39, and in S39, determine whether the high bath temperature caution information has not been notified. If the determination in S39 is Yes, proceed to S40, and in S40, notify the high bath temperature caution information by the bathroom remote control 4 and the kitchen remote control 5, and proceed to S41.

[0039] On the other hand, when the determination in S38 is No, the process proceeds to S41 without notifying the hot bath high temperature caution information. When the determination in S39 is No, the process proceeds to S41 without repeating the notification. Then, in S41, it is determined whether the hot water temperature in the bathtub 3 has reached the set temperature or not. If the determination in S41 is No, the post - heating continues and the process returns to S36. If the determination in S41 is Yes, the process proceeds to S33. In S33, the post - heating is terminated and the maintenance of the water level and temperature is terminated, and then the process returns.

[0040] Also, based on the fluctuation of the water level in the bathtub 3, the detection of getting out of the bathtub 3 during post - heating is detected. When the determination in S36 is No, the process proceeds to S42. Next, in S42, the post - heating is terminated and the process proceeds to S43. In S43, the hot water temperature of the bathtub 3 at the end of the post - heating is obtained, and the process proceeds to S44. Then, in S44, the set temperature is changed to the hot water temperature of the bathtub 3 at the end of the post - heating, the maintenance of the water level and temperature is terminated, and the process returns.

[0041] When the maintenance of the water level and temperature is completed, the process proceeds to S3 in FIG. 2. In S3, it is determined whether there is an operation to change the setting of the automatic hot bath operation. For example, if the user during bathing changes the set temperature to increase from the bathroom remote control 4 and the determination in S3 is Yes, the process returns to S2 to start the maintenance of the water level and temperature in order to set the changed set temperature. If this user gets out of the bathtub during the post - heating for setting the changed set temperature, the post - heating is terminated halfway as described above, and the set temperature is re - changed to the hot water temperature at the end of the post - heating. This reduces the energy consumption of the post - heating.

[0042] Also, when the determination in S3 is No, the process proceeds to S4. In S4, it is determined whether the user has entered the bathroom or not. When the entry of the user into the bathroom is detected by the human - sensing sensor 4c of the bathroom remote control 4 and the determination in S4 is Yes, the process proceeds to S5. In S5, the hot water temperature of the bathtub 3 is obtained, and the process proceeds to S6. Then, in S6, it is determined whether the hot water temperature of the bathtub 3 is equal to or higher than a preset caution temperature or not.

[0043] If the determination in S6 is Yes, proceed to S7, where it is determined whether the high bath temperature caution information has not been notified. If the determination in S7 is Yes, proceed to S8, where the high bath temperature caution information is notified by the bathroom remote control 4 and then proceed to S9. This enables the user just before entering the bathroom to be notified that the hot water temperature in the bathtub 3 is high and to be prompted to take precautions.

[0044] On the other hand, if the determination in S4 is No, the determination in S6 is No, or the determination in S7 is No, proceed to S9. Then, in S9, it is determined whether there has been an operation to end the bath automatic operation. If the determination in S9 is No, continue the bath automatic operation and return to S2. If the determination in S9 is Yes, end the bath automatic operation. Incidentally, S3 to S9 may be repeated for a predetermined time so as to shift to the step of maintaining the water level and temperature at a predetermined time cycle.

[0045] The operation and effect of the above-described bath water supply device 1 will be described. When the set temperature is increased and changed during the bath automatic operation, the bath water supply device 1 performs afterburning until the changed set temperature is reached. Then, during the afterburning due to the increase and change of the set temperature in the state where bathing is detected during the bath automatic operation, if leaving the bath is detected, even if the changed set temperature has not been reached, the bath water supply device 1 ends the afterburning halfway. Moreover, the set temperature is re-changed to the hot water temperature in the bathtub 3 at the end of this afterburning. Therefore, since the hot water temperature in the bathtub 3 is maintained at the re-changed set temperature lower than the increased and changed set temperature during the bath automatic operation, it is possible to prevent the temperature of the bathtub 3 from becoming high and to reduce the wasted energy.

[0046] The bathtub water supply device 1 performs reheating as the set temperature is increased, and when the hot water temperature in the bathtub 3 reaches or exceeds a preset caution temperature, it notifies the bathtub high-temperature caution information to prompt attention to the high temperature during bathing. Therefore, when the set temperature is increased before bathing, the user can be informed that the hot water in the bathtub 3 is at a high temperature, and attention can be prompted to prevent accidental bathing in the high-temperature hot water. Also, it is possible to prompt attention to the high-temperature hot water for the user during bathing to prevent bathing accidents.

[0047] In addition, the bathtub water supply device 1 performs reheating as the set temperature is increased, and when the hot water temperature in the bathtub 3 is at or above the preset caution temperature and it detects that a user has entered the bathroom, it notifies this entered user of the bathtub high-temperature caution information to prompt attention to the high temperature during bathing. Therefore, the user immediately before bathing can be informed that the hot water in the bathtub 3 is at a high temperature, and attention can be prompted to prevent accidental bathing in the high-temperature hot water.

[0048] In addition, those skilled in the art can implement the present invention in various modified forms without departing from the spirit of the present invention, and the present invention encompasses such modified forms.

Explanation of Reference Numerals

[0049] 1: Bathtub water supply device 3: Bathtub 4: Bathroom remote control 5: Kitchen remote control 11: Fuel gas supply unit 12: Blower fan 13: Water supply burner 14: Bathtub burner 15: Water supply heat exchanger 16: Bathtub heat exchanger 17: Water supply passage 18: Water supply flow sensor 19: Distribution valve 20: Control unit (control means) 21: Neutralizer 22: Hot water outlet passage 23: Water supply bypass passage 24: Hot water pouring valve 25: Hot water pouring passage 26: Hot water pouring flow sensor 27: Bathtub pump 28: Afterburning passage 29: Water level sensor (water level detection means) 30: Bathtub temperature sensor (temperature detection means)

Claims

1. A hot water pouring passage for pouring heated hot water into a bathtub, a reheating passage for heating the hot water in the bathtub, a water level detection means for detecting the water level of the bathtub, a temperature detection means for detecting the temperature of the hot water in the bathtub, and a bathtub automatic operation for pouring hot water into the bathtub until a set water level is reached at a preset set temperature, maintaining the set water level, and reheating when the temperature of the hot water in the bathtub drops to maintain the set temperature. In a bathtub water supply device having control means for controlling, detecting bathing and leaving the bath based on fluctuations in the water level of the bathtub, and performing reheating so as to reach the changed set temperature when the set temperature is increased and changed during the reheating due to the increase and change of the set temperature during the automatic bathtub operation, when the control means detects leaving the bath during reheating due to an increase and change in the set temperature in a state where bathing has been detected, the reheating is terminated halfway, and the set temperature is reset to the temperature of the hot water in the bathtub at the end of the reheating. A bathtub water supply device characterized by re-changing.

2. having notification means for notifying information regarding the automatic bathtub operation, when the temperature of the hot water in the bathtub becomes equal to or higher than a preset caution temperature due to reheating accompanying an increase and change in the set temperature, the control means notifies the bathtub high temperature caution information by the notification means. The bathtub water supply device according to claim 1.

3. having entry detection means for detecting the entry of a person into the bathroom and notification means for notifying information regarding the automatic bathtub operation in the bathroom, when the entry detection means detects entry, if the temperature of the hot water in the bathtub is equal to or higher than a preset caution temperature, the control means notifies the bathtub high temperature caution information by the notification means. The bathtub water supply device according to claim 1 or 2.

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