JP2016080218A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater that prevents setting of a water level correction value inappropriate for a target hot water filling water level.SOLUTION: Water level change detection means 47 detects change of a water level of hot water within a bathtub 2 caused by a factor other than an automatic hot water filling operation. Water level correction value updating means updates a water level correction value so as to reduce a water level difference between a detection water level obtained by a water level sensor when target hot water filling amount of hot water is supplied to the bathtub 2 through the automatic hot water filling operation and a target hot water filling water level, and does not update the water level correction value on the basis of the water level difference through automatic hot water filling operation this time when change of the water level of the hot water within the bathtub 2 caused by a factor other than the automatic hot water filling operation is detected by the water level change detection means 47 while the automatic hot water filling operation is being executed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot water supply apparatus having an automatic hot water filling function.

  Conventionally, a hot water supply apparatus having an automatic hot water filling function for supplying hot water to a bathtub until a target hot water level set by a remote controller or the like is known (see, for example, Patent Document 1). The hot water supply apparatus described in Patent Document 1 includes a water level sensor that detects the water level in the bathtub and a flow rate sensor that detects the flow rate of the hot water supplied to the bathtub, and changes over time from the start of use of the hot water supply apparatus. Correction processing is performed to cope with detection errors of the water level sensor due to the above.

  Specifically, during the trial run of automatic hot water filling that is performed when the hot water supply device is installed, the correspondence between the amount of hot water supplied to the bathtub (the integrated value of the flow rate detected by the flow sensor) and the detected water level of the water level sensor is learned and based on this correspondence Thus, the amount of hot water supply (the amount of hot water filling) necessary for hot water filling at the target hot water filling water level is determined.

  When automatic hot water filling is started after the use of the hot water supply device is started, a water level correction value is calculated based on the water level difference between the detected water level value of the water level sensor when the hot water filling is completed and the target hot water filling level. Water level control after filling is performed based on the water level obtained by adding a water level correction value to the water level detected by the water level sensor.

JP 2010-276253 A

  When the water level correction value of the target hot water level is set so as to reduce the water level difference between the detected water level of the water level sensor and the target hot water level when automatic hot water filling is completed, It has been found that a water level correction value may be set.

  The present invention has been made in view of such a background, and an object thereof is to provide a hot water supply apparatus that prevents an inappropriate water level correction value from being set with respect to a target hot water level.

The present invention has been made to achieve the above object, and the hot water supply apparatus of the present invention comprises:
A hot water supply means for supplying hot water to the bathtub;
Water level detection means for detecting the level of hot water in the bathtub;
Hot water detection means for detecting the amount of hot water supplied to the bathtub from the hot water supply means;
Hot water is supplied to the bathtub by the hot water supply means, and the correspondence between the hot water level in the bathtub detected by the water level detection means and the amount of hot water supplied to the bathtub detected by the hot water detection means Correspondence calculating means for calculating;
A target hot water amount that determines a target hot water amount corresponding to a corrected hot water level set based on a predetermined target hot water level and a water level correction value for adjusting the target hot water level based on the correspondence relationship. Tension amount determining means;
Hot water filling control means for executing automatic hot water filling operation for supplying hot water of the target hot water amount to the bathtub by the hot water supply means;
The water level correction value is set so as to reduce the difference between the detected water level of the water level detecting means and the target hot water level when the target hot water amount is supplied to the bathtub by the automatic hot water operation. The present invention relates to a water heater provided with a water level correction value updating means for updating.

And the hot water supply apparatus of this invention is
Water level change detecting means for detecting a change in the water level of the hot water in the bathtub due to factors other than the automatic hot water operation,
When the water level correction value updating means detects a change in the water level of the hot water in the bathtub due to a factor other than the automatic water filling operation by the water level change detection means during execution of the automatic water filling operation, The water level correction value is not updated based on the water level difference in the automatic hot water operation.

  According to the present invention, for example, during a trial operation performed when the hot water supply device is installed, the correspondence calculation means detects the hot water level in the bathtub detected by the water level detection means and the hot water amount detection means. A correspondence relationship with the amount of hot water supplied to the bathtub is calculated. And if the said correspondence is maintained, the target amount of hot water filling according to the target hot water level can be determined appropriately based on the said correspondence. However, when the correspondence changes from the time of calculation due to fluctuations in the water level detected by the water level sensor due to aging described above, or when the horizontal sectional area of the bathtub changes according to the water level, as described later, Based on the correspondence relationship, an appropriate target hot water amount corresponding to the target hot water level cannot be obtained. Therefore, the water level correction value updating means reduces the water level difference between the detected water level of the water level detecting means and the target hot water level when supplying the target hot water amount by the automatic hot water operation. In addition, it is effective to update the water level correction value.

  Here, when the target amount of hot water is supplied to the bathtub by the automatic hot water operation, factors other than the automatic hot water operation (addition of hot water to the bathtub by the user or from the bathtub) When the water level of the hot water in the bathtub is changed by taking out hot water, draining the bathtub, etc.), the water level of the hot water in the bathtub when the target hot water amount is supplied to the bathtub by the hot water supply means Instead of the amount of tension, it depends on the target amount of hot water filling + α (increase or decrease in water level due to factors other than automatic hot water filling operation). And if the said water level correction value is updated based on the water level difference between the hot water level corresponding to the target hot water amount + α and the target hot water level, an inappropriate water level correction value will be set.

  Therefore, the water level correction value updating means changes the water level of the hot water in the bathtub due to a factor other than the automatic hot water operation when supplying the target hot water amount by the automatic hot water operation. When it is detected, the correction water level value is not updated based on the water level difference in the current automatic filling operation. Thereby, it is possible to prevent an inappropriate water level correction value from being set for the target hot water level.

In addition, a water replenishing means for performing a water replenishment operation for supplying a predetermined amount of hot water to the bathtub,
The water level change detecting means detects that the water level of the hot water in the bathtub has changed due to a factor other than the automatic hot water operation when the water replenishing operation is executed by the water replenishing means.

  According to this configuration, when the water level in the bathtub changes due to the hot water being supplied to the bathtub by the water replenishment operation, the water level change detection means is caused by a factor other than the automatic water filling operation. It can be detected as a thing.

Moreover, the water reduction detection means which detects the reduction | decrease of the hot water in the said bathtub is provided,
The water level change detecting means detects that the water level of the hot water in the bathtub has changed due to a factor other than the automatic hot water operation when the decrease in hot water in the bathtub is detected by the reduced water detecting means. Features.

  According to this configuration, for example, when the user removes the drain plug of the bathtub or pumps hot water from the bathtub, a decrease in hot water in the bathtub is detected by the water decrease detection means. Therefore, when the water level change detecting means detects a decrease in the hot water in the bathtub by the water decrease detecting means, the water level change detecting means detects the change in the hot water level in the bathtub due to the decrease in the hot water other than the automatic hot water operation. It can be detected as a result of this factor.

The block diagram of a hot-water supply apparatus. Explanatory drawing of the hot water level. Flow chart of automatic hot water operation. The flowchart of the update process of a boiling and a water level correction value.

  An embodiment of a hot water supply apparatus of the present invention will be described with reference to FIGS. Referring to FIG. 1, a hot water supply device 1 according to the present embodiment includes a main body 5 and a remote controller 6 connected to the main body 5 through a communication cable 7.

  The main body 5 includes a hot water supply unit 10 (corresponding to the hot water supply means of the present invention) for heating water supplied from a water supply (not shown) to the water supply channel 11, a reheating unit 20 for heating hot water stored in the bathtub 2, And a controller 40 that controls the overall operation of the water heater 1.

  The hot water supply unit 10 detects the temperature of hot water supplied to the water supply path 11 from the hot water supply unit 10, the hot water supply heat exchanger 12 provided in the middle of the water supply path 11, the hot water supply burner 13 that heats the hot water supply heat exchanger 12. The hot water supply temperature sensor 19 is provided. In the gas supply path 15 connected to the hot water supply burner 13, the gas source valve 16 and the hot water supply gas valve 17 that open and close the gas supply path 15 and the fuel gas supply flow rate to the hot water supply burner 13 are changed in order from the upstream side. A hot water supply flow rate adjustment valve 18 is provided.

  The chasing unit 20 includes a chasing heat exchanger 22 provided in the middle of the chasing circulation path 21 whose both ends are connected to the bathtub 2 by adapters 60, and a chasing burner 23 for heating the chasing heat exchanger 22. The circulating pump 24 for circulating hot water in the bathtub 2 through the circulation circuit 21 and the temperature of hot water in the circulation circuit 21 upstream of the heating heat exchanger 22 (temperature of hot water in the bathtub 2) ) Is detected. The gas supply path 15 connected to the additional burner 23 includes an additional gas valve 27 that opens and closes the gas supply path 15 in order from the upstream side, and an additional supply that changes the supply flow rate of the fuel gas to the additional burner 23. A flow control valve 28 is provided.

  The recirculation circuit 21 includes a water flow switch 25 that detects the presence or absence of hot water flowing through the recirculation circuit 21, and a water level sensor 26 that detects the water level of hot water stored in the bathtub 2 (the water level detection of the present invention). Corresponding to the means).

  The water supply passage 11 is connected to the recirculation circulation passage 21 via the hot water filling relay passage 30 at a location downstream of the hot water supply heat exchanger 12. The hot water filling relay passage 30 has a hot water filling valve 31 for opening and closing the hot water filling relay passage 30, and a flow rate of hot water supplied from the water supply passage 11 to the bathtub 2 via the hot water filling relay passage 30 and the additional circulation passage 21. And a flow rate sensor 32 for detecting.

  The controller 40 is an electronic circuit unit including a CPU, a memory, various interface circuits, and the like (not shown). The CPU 40 executes a control program for the hot water supply device 1 held in the memory, so It functions as the sowing control means 42, the hot water amount detection means 43, the correspondence calculation means 44, the target hot water amount determination means 45, the water level correction value update means 46, the water level change detection means 47, and the water decrease detection means 48. The operation of these means will be described later.

  The remote controller 6 includes a display 50 that displays an operation state of the hot water supply device 1, an operation state of the hot water supply device 1 (a state in which the hot water supply unit 10 and the reheating unit 20 can be operated) and a standby state (the hot water supply unit 10 and the renewal operation) Operation switch 51 for instructing switching to a state in which the unit 20 cannot be operated), hot water filling switch 52 for instructing execution of automatic hot water filling operation, and reheating switch for instructing execution of chasing operation 53, a change switch 54 for instructing a change in the hot water supply temperature, etc., a mode changeover switch 55 for instructing a change target to be changed by the change switch 54, and an additional hot water for supplying a predetermined amount of hot water to the bathtub 2 And an additional water switch 57 for instructing additional water for supplying a predetermined amount of water to the bathtub 2.

  In the operating state, the hot water supply control means 41 discharges hot water at the target hot water temperature set by the remote controller 6 from the curan 35 or the like when water is supplied from the water supply to the water supply channel 11 by opening the curan 35 or the like. As described above, the hot water supply operation for adjusting the combustion amount of the hot water supply burner 13 based on the temperature detected by the hot water supply temperature sensor 19 is executed.

  Moreover, the hot water supply control means 41 performs an automatic hot water filling operation when the hot water filling switch 52 of the remote controller 6 is operated in the operating state. In automatic hot water filling operation, the hot water supply control means 41 opens the hot water filling valve 31 and hot water at the target hot water filling temperature set by the remote controller 6 is supplied from the hot water supply unit 10 to the hot water filling relay passage 30 and the additional circulation passage. The amount of combustion of the hot water supply burner 13 is adjusted based on the temperature detected by the hot water supply temperature sensor 19 and the like so as to be supplied to the bathtub 2 via 21.

  The hot water detection means 43 detects the amount of hot water in the bathtub 2 by integrating the flow rate detected by the flow sensor 32 during execution of the automatic hot water filling operation. Then, the hot water supply control means 41 closes the hot water filling valve 31 when the amount of hot water detected by the hot water amount detection means 43 reaches the target hot water filling amount corresponding to the target hot water filling water level set by the remote controller 6. At the same time, the combustion of the hot water supply burner 13 is stopped and the automatic hot water filling operation is ended. The configuration in which the hot water supply control means 41 executes the automatic hot water filling operation corresponds to the hot water filling control means of the present invention.

  Further, the hot water supply control means 41 adds the constant amount of hot water to the bathtub 2 by opening the hot water filling valve 31 and burning the hot water supply burner 13 when the additional hot water switch 56 of the remote controller 6 is operated. A hot water operation (corresponding to the water replenishment operation of the present invention) is performed. Further, the hot water supply control means 41 opens the hot water filling valve 31 and supplies a certain amount of water to the bathtub 2 when the additional water switch 57 of the remote controller 6 is operated (the supplementary water operation of the present invention). Equivalent to). The configuration in which the hot water supply control means 41 performs the addition water operation and the addition water operation corresponds to the water replenishment means of the present invention.

  The chasing control means 42 activates the circulation pump 24 when the chasing switch 53 of the remote controller 6 is operated to bring the hot water in the bathtub 2 into a state of being circulated through the chasing circulation path 21. By burning the burning burner 23, a reheating operation for heating hot water in the bathtub 2 is performed. The reheating control means 42 stops combustion of the reheating burner 23 and the circulation pump 24 when the temperature detected by the bath temperature sensor 29 (equal to the temperature of the hot water in the bathtub 2) reaches the target hot water filling temperature. To stop driving.

  The correspondence calculation means 44 supplies hot water from the hot water supply unit 10 to the bathtub 2 in the test operation performed by the installation operator when the hot water supply device 1 is installed, and the water level of the hot water in the bathtub 2 detected by the water level sensor 26. The correspondence relationship with the amount of hot water supplied to the bathtub 2 from the hot water supply unit 10 detected by the hot water amount detection means 43 is calculated.

  As shown in FIG. 2, the target hot water filling amount determining means 45 is 50 mm higher than the reference water level (water level at the position of the adapter 60) Lv0 in accordance with the operation of the change switch 54 and the mode changeover switch 55 of the remote controller 6. From Lv12 to Lv12, one of the 12 switching stages with the ranks in which the water level gradually increases is selected as the target hot water level.

  Then, the target hot water amount determining means 45 adds the water level correction value to the target hot water level and obtains the corrected hot water level, and applies this corrected hot water level to the above-mentioned correspondence relationship to cope with the corrected hot water level. The target amount of hot water is determined. Here, the initial value of the water level correction value is set to zero.

  In the state where the water level sensor 26 detects that water is stored in the bathtub 2 up to a water level higher than the reference water level Lv0 by the water level sensor 26, the water level detected by the water level sensor 26 continuously decreases. Sometimes, it is detected that the drain plug 61 of the bathtub 2 is opened and the hot water in the bathtub 2 is decreasing. The water reduction detection means 48 may be configured to directly detect the open / closed state of the drain plug 61 with a sensor.

  Further, the water level detection means 48 is detected by the water level sensor 26 during the automatic filling operation in a state where the water level sensor 26 detects that water is stored in the bathtub 2 up to a water level higher than the reference water level Lv0. When the water level temporarily decreases, it is detected that hot water has been taken out from the bathtub 2 and the hot water in the bathtub 2 has decreased.

  The water level change detecting means 47 is provided in the bathtub 2 when the hot water operation or the adding water operation is executed by the hot water supply control means 41 and when the hot water in the bathtub 2 is detected by the water reduction detecting means 48. It is detected that the water level of the hot water has changed due to factors other than automatic hot water operation.

  Next, according to the flowcharts shown in FIGS. 3 and 4, the execution procedure of the automatic hot water filling operation by the hot water supply control means 41 and the water level correction value update processing by the water level correction value update means 46 will be described.

  FIG. 3 is a flowchart of the automatic filling operation. In STEP 1, the hot water supply control means 41 opens the hot water filling valve 31 and supplies 6 liters of hot water to the bathtub 2 by the hot water supply unit 10. In subsequent STEP 2, the hot water supply control means 41 performs a circulation determination that determines whether or not the water flow switch 25 is turned on by operating the circulation pump 24.

  When hot water of the reference water level Lv0 or more is stored in the bathtub 2, since the hot water in the bathtub 2 circulates through the tracking circuit 21 by the operation of the circulation pump 24, the water flow switch 25 is turned on. (Circulation determination ON). On the other hand, when hot water of the reference water level Lv0 or higher is not stored in the bathtub 2, the hot water in the bathtub 2 is not circulated through the recirculation circuit 21 even if the circulation pump 24 is operated. Is OFF (circulation determination OFF).

  When the circulation determination is ON (the hot water of the reference water level Lv0 or higher is stored in the bathtub 2), the process branches to STEP 10, and the hot water supply control means 41 uses the water level sensor 26 to determine the hot water level in the bathtub 2 (current water level). Is detected. In subsequent STEP 11, the hot water supply control means 41 subtracts the current water level from the corrected hot water level obtained by adding the corrected water level value to the target hot water level, calculates the water level difference between them, and applies this water level difference to the above correspondence relationship. Then, the amount of hot water shortage with respect to the target hot water filling amount is calculated.

  Then, in subsequent STEP 12, the hot water supply control means 41 supplies hot water for the amount of insufficient hot water calculated in STEP 11 from the hot water supply unit 10 to the bathtub 2, and proceeds to STEP 13 in FIG. Thereby, the hot water supply control means 41 performs hot water filling to the bathtub 2 corresponding to the correction hot water filling water level.

  On the other hand, when the circulation determination is OFF in STEP 2, the process proceeds to STEP 3, and the hot water supply control means 41 supplies hot water corresponding to the reference water level Lv0 + 5 cm from the hot water supply unit 10 to the bathtub 2. Then, the circulation determination is performed again in STEP4. If the circulation determination is ON, the process branches to STEP10. If the circulation determination is OFF, the process proceeds to STEP5.

  In STEP 5, the hot water supply control means 41 supplies 10 liters of hot water from the hot water supply unit 10 to the bathtub 2. Then, the circulation determination is performed in the subsequent STEP 6, and when the circulation determination is ON, the process branches to STEP 30, and the hot water supply control means 41 supplies 10 liters of hot water to the bathtub 2. At the next STEP 31, the hot water supply control means 41 performs circulation determination. When the circulation determination is ON, the process proceeds to STEP 10, and when the circulation determination is OFF, the process branches to STEP 7.

  In STEP 7, the hot water supply control means 41 determines whether or not the integrated amount of hot water filling every 10 liters to the bathtub 2 in STEP 5 and STEP 30 is 50 liters or less. When the integrated amount is 50 liters or less, the process returns to STEP5. On the other hand, when the integrated amount exceeds 50 liters, there is a high possibility that the drain plug 61 of the bathtub 2 is opened. In this case, hot water cannot be applied to the bathtub 2. Accordingly, the process proceeds to STEP 8 where the hot water supply control means 41 stops the automatic hot water filling operation, performs an error process for displaying an error on the display 50 of the remote controller 6 and sounding a buzzer (not shown).

  STEP 13 and STEP 20 to STEP 21 in FIG. 4 are processes for boiling the hot water in the bathtub 2 to the target hot water temperature when the temperature of the hot water in the bathtub 2 is lower than the target hot water temperature set by the remote controller 6. is there. The hot water supply control means 41 determines whether or not the temperature of hot water in the bathtub 2 detected by the bath temperature sensor 29 in STEP 13 is equal to or higher than the target hot water filling temperature.

  And when the temperature of the hot water in the bathtub 2 is more than the target hot water temperature, it progresses to STEP14, and when the temperature of the hot water in the bathtub 2 is lower than the target hot water temperature, it branches to STEP20. STEP 20 to STEP 21 are processes performed by the tracking control unit 42. The reheating control means 42 operates the circulation pump 24 and burns the reheating burner 23 in STEP 20 until the temperature of the hot water in the bathtub 2 becomes equal to or higher than the target hot water filling temperature in STEP 21, and the reheating circulation path 21. A reheating operation for heating the hot water in the bathtub 2 circulated through the tub is executed. When the bath temperature becomes equal to or higher than the target hot water temperature, the chasing operation is terminated and the process proceeds to STEP14.

  STEP 14 to STEP 16 are processes by the water level correction value update means 46. The water level correction value updating means 46 determines in STEP 14 whether or not a change in the water level of the hot water in the bathtub 2 due to a factor other than the automatic water filling operation is detected by the water level change detecting means 47 during the automatic water filling operation. To do.

  And when the change in the water level of the hot water in the bathtub 2 is not detected by the water level change detecting means 47, the hot water level in the bathtub 2 is the target hot water set by applying the corrected hot water level to the corresponding relationship. It corresponds to the amount of tension. Therefore, in the subsequent STEP 15, the water level correction value updating means 46 determines that the current hot water level in the bathtub 2 (current water level, water level at the end of the automatic hot water operation) detected by the water level sensor 26 is the target hot water level. It is judged whether it is lower than the water level threshold value 10 mm lower.

  When the current water level is lower than the water level threshold (when the degree of deficiency of the water level of the hot water supplied to the bathtub 2 by the automatic hot water operation is large with respect to the target hot water level), the process proceeds to STEP 16 and the water level correction value is reached. The update means 46 updates the water level correction value ΔH according to the following equation (1) and proceeds to STEP 17 in order to reduce the water level difference between the current water level and the target hot water level, and the water level correction value update means 46 performs processing. Exit.

ΔH (t) = ΔH (t−1) + (Ha−Hs) / 2 (1)
Where ΔH (t): water level correction value after update, ΔH (t−1): water level correction value before update, Ha: target hot water level, Hs: hot water level at the end of automatic hot water operation.

  The second term ((Ha−Hs) / 2) on the right side of the formula (1) may be a value that reduces the difference in water level between the current water level and the target hot water level, and may be a fixed value.

  On the other hand, when the current water level is equal to or higher than the water level threshold (when the degree of water level deficiency of the hot water supplied to the bathtub 2 by the automatic hot water operation is small relative to the target hot water level), the water level correction value is updated. Since there is no need, STEP 14 branches to STEP 17 and the water level correction value updating means 46 ends the process.

  Further, in STEP 14, when the water level change detecting means 47 detects a change in the hot water level in the bathtub 2 due to a factor other than the automatic hot water operation, the hot water level in the bathtub 2 is set to the corrected hot water level. It does not correspond to the target hot water amount set by applying to the above correspondence. In this case, if the water level correction value is updated by the above equation (1), an inappropriate water level correction value is set.

  Therefore, in this case, the process branches to STEP 17 and the processing is terminated, and the water level correction value updating means 46 updates the water level correction value based on the water level difference between the water level at the end of this automatic hot water filling operation and the target hot water level. Do not do. Thereby, it is possible to prevent an inappropriate water level correction value from being set for the target hot water level.

  In addition, in this embodiment, although the continuous flow type hot water supply unit 10 which heats the water which distribute | circulates the water supply path 11 with the hot water supply heat exchanger 12 was shown as a hot water supply means of this invention, it is based on other structures, such as a hot water storage type. Hot water supply means may be used.

  DESCRIPTION OF SYMBOLS 1 ... Hot-water supply apparatus, 2 ... Bathtub, 10 ... Hot-water supply unit (hot-water supply means), 40 ... Controller, 41 ... Hot-water supply control means (hot water control means, supplemental water means), 42 ... Reheating control means, 43 ... Hot water amount detection means, 44 ... correspondence calculating means, 45 ... target hot water amount determining means, 46 ... water level correction value updating means, 47 ... water level change detecting means, 48 ... water reduction detecting means.

Claims (3)

A hot water supply means for supplying hot water to the bathtub;
Water level detection means for detecting the level of hot water in the bathtub;
Hot water detection means for detecting the amount of hot water supplied to the bathtub from the hot water supply means;
Hot water is supplied to the bathtub by the hot water supply means, and the correspondence between the hot water level in the bathtub detected by the water level detection means and the amount of hot water supplied to the bathtub detected by the hot water detection means Correspondence calculating means for calculating;
A target hot water amount that determines a target hot water amount corresponding to a corrected hot water level set based on a predetermined target hot water level and a water level correction value for adjusting the target hot water level based on the correspondence relationship. Tension amount determining means;
Hot water filling control means for executing automatic hot water filling operation for supplying hot water of the target hot water amount to the bathtub by the hot water supply means;
The water level correction value is set so as to reduce the difference between the detected water level of the water level detecting means and the target hot water level when the target hot water amount is supplied to the bathtub by the automatic hot water operation. A hot water supply device comprising a water level correction value updating means for updating,
Water level change detecting means for detecting a change in the water level of the hot water in the bathtub due to factors other than the automatic hot water operation,
When the water level correction value updating means detects a change in the water level of the hot water in the bathtub due to a factor other than the automatic water filling operation by the water level change detection means during execution of the automatic water filling operation, The hot water supply apparatus, wherein the water level correction value is not updated based on the water level difference in the automatic hot water operation. The hot water supply apparatus according to claim 1,
Comprising water replenishing means for performing a water replenishment operation for supplying a predetermined amount of hot water to the bathtub;
The water level change detecting means detects that the water level in the bathtub has changed due to a factor other than the automatic hot water operation when the water replenishing operation is executed by the water replenishing means. . The hot water supply apparatus according to claim 1,
Comprising a reduced water detecting means for detecting a decrease in hot water in the bathtub;
The water level change detecting means detects that the water level of the hot water in the bathtub has changed due to a factor other than the automatic hot water operation when the decrease in hot water in the bathtub is detected by the reduced water detecting means. A hot water supply device.

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