JP4277772B2 - Hot water heater - Google Patents

Description

  The present invention relates to a hot water storage water heater that uses electric power to boil hot water, and more particularly to a hot water storage water heater that uses a heat pump cycle using carbon dioxide as a refrigerant.

Conventionally, in hot water storage water heaters that use midnight power to boil the entire tank, hot water boiling operation is performed during the day to compensate for the shortage. In order to shorten the hot water boiling operation time, it has been proposed that the frequency of the compressor is corrected and increased during hot water boiling operation rather than during midnight boiling operation (for example, Patent Document 1). reference).
JP 2003-161545 A (paragraph numbers (0014) (0015), etc.)

  For example, as proposed in Patent Document 1, the hot water boiling operation time can be shortened by setting the capacity of the compressor at the time of boiling water boiling operation higher than that at the time of boiling operation at midnight. .

  However, there is a limit to increasing the capacity of the heating means such as a compressor, and in particular, in the case of a heat pump cycle using carbon dioxide as a refrigerant, there is an inconvenience of lowering the COP, as well as operating noise and vibration. There is also a tendency to increase somewhat compared to during rated operation.

  Therefore, the present invention provides a power operation mode in which the heating capacity is significantly increased compared to the rated operation mode in which normal boiling operation is performed, and changes the boiling temperature in the power operation mode, thereby suppressing the decrease in COP. The purpose of this is to shorten the boiling time of hot water and to inform the user that the power operation mode is in progress and to improve the user's satisfaction.

The hot water storage water heater of the present invention according to claim 1 comprises a hot water storage tank, a hot water pipe provided at the upper part of the hot water storage tank, a water supply pipe provided at the lower part of the hot water storage tank, and water at the lower part of the hot water storage tank. A boiling pipe leading to the upper part, a boiling pump provided in the boiling pipe, a heating means disposed in the middle of the boiling pipe for heating water supplied by the boiling pump, and the hot water storage tank includes a remaining hot water calculating means to calculate the amount of hot water inside, and an operation display unit for performing operation instruction and status of the heating means, and a bath automatic hot water filling means for supplying a predetermined amount of hot water in the bathtub, the total amount boiling In addition to setting a time zone for performing the raising operation, and setting to perform the hot water boiling operation when the predetermined remaining hot water amount is calculated by the remaining hot water amount calculating means, the water is kept within the rated capacity range when the whole amount is heated. in rated operation mode for heating Rolling, and the time the boiling water shortage is a storage-type water heater operating at a power operation mode for heating water in a capacity range set exceeds the rated capacity, at the time of bath automatic water filling operation, the remaining Even if hot water is not detected by the hot water calculating means, it is calculated from the amount of hot water supplied to the bathtub by the bath automatic hot water filling means and the amount of hot water detected by the hot water storage detecting means provided in the hot water storage tank. Based on the amount of remaining hot water after the bath automatic hot water filling operation is completed, the hot water boiling operation is performed before the bath automatic hot water filling operation is completed, and power operation is performed on the operation display unit when operating in the power operation mode. It is characterized in that the mode is displayed.

Water storage type water heater of the present invention according to claim 2, in storage type water heater according to claim 1, the boiling temperature of the power over the operating mode, to a temperature lower than the temperature boiling during rated operation mode It is characterized by.

A hot water storage type water heater according to a first embodiment of the present invention includes a hot water storage tank, a hot water pipe provided at an upper part of the hot water storage tank, a water supply pipe provided at a lower part of the hot water storage tank, and a lower part of the hot water storage tank. A boiling pipe for leading water to the upper part, a boiling pump provided in the boiling pipe, a heating unit disposed in the middle of the boiling pipe and heating water supplied by the boiling pump; A remaining hot water amount calculating means for calculating the remaining hot water amount in the hot water storage tank, an operation display section for displaying operation instructions and status of the heating means, and a bath automatic hot water filling means for supplying a predetermined amount of hot water to the bathtub. A time zone for performing the boiling operation is set, and when the predetermined remaining hot water amount is calculated by the remaining hot water amount calculation means, the hot water boiling operation is set to be performed. Rated operation to heat A hot water storage water heater that operates in a power operation mode that heats water within a capacity range that exceeds the rated capacity at the time of boiling out of the hot water. The amount of hot water supplied to the bathtub by the bath automatic hot water filling means, and the amount of hot water detected by the hot water storage amount detecting means provided in the hot water storage tank, even if the remaining hot water amount calculating means has not detected a hot water outage The hot water boiling operation is performed before the bath automatic hot water filling operation is completed based on the amount of remaining hot water after the bath automatic hot water filling operation is calculated from the operation display unit during operation in the power operation mode. Is displayed in the power operation mode . According to the present embodiment, a predetermined amount of hot water can be stored at an early stage by setting the heating capability when boiling out of boiling water to a power operation mode that is significantly higher than the rated capability during normal heating operation. At the same time, it is possible to notify the user that the increase in driving noise and vibration accompanying switching to the power driving mode is not a failure but accompanying power driving, and the usability can be improved.

The remaining hot water amount calculating means calculates the remaining hot water amount after completion of the automatic hot water filling operation from the hot water amount supplied to the bathtub by the automatic hot water filling means and the hot water storage amount detected by the hot water amount detecting means provided in the hot water storage tank. Therefore, it is possible to reliably prevent hot water shortage at the end of bath filling and perform hot water boiling operation during the bath automatic hot water operation time period. A predetermined amount of hot water can be stored without running out of hot water.

The hot water storage water heater according to the second embodiment of the present invention is a hot water storage water heater according to the first embodiment, wherein the hot water temperature level changes the boiling temperature according to the operation mode changed by the capacity control means. It has a change means, and the boiling temperature in the power operation mode is set to a temperature lower than the boiling temperature in the rated operation mode. According to this embodiment, by setting a low boiling temperature in the power operation mode, as possible out to store a predetermined amount of hot water at an early stage without lowering the COP.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a hot water storage type water heater according to an embodiment of the present invention.

  A hot water discharge pipe 2 is provided at the upper part of the hot water storage tank 1, and a water supply pipe 3 is provided at the lower part of the hot water storage tank 1. The lower part and the upper part of the hot water storage tank 1 are communicated with each other by a boiling pipe 4, and the water in the lower part of the hot water storage tank 1 is led to a heat exchanger 6 by a boiling pump 5, and heat is exchanged by the heat exchanger 6 for hot water. And led to the upper part of the hot water storage tank 1. When hot water is supplied from the hot water discharge pipe 2, water is supplied from the water supply pipe 3 into the hot water storage tank 1, and in the hot water storage tank 1, the hot water is separated into the upper part and the water from the lower part due to the difference in specific gravity, and the hot water is pushed down. Accumulated in layers. The hot water storage tank 1 is provided with a plurality of water temperature detectors 7 that detect the upper water temperature from the lower part of the hot water storage tank 1. Here, the water temperature detector 7a disposed at the bottom of the hot water storage tank 1 and the water temperature detector 7b disposed above the water temperature detector 7a are used as the feed water temperature detector, and are disposed at the top of the hot water storage tank 1. The water temperature detector 7e and the water temperature detectors 7d and 7c arranged in order below the water temperature detector 7e will be described as a remaining hot water amount detector.

  The water temperature detectors (feed water temperature detectors) 7a and 7b determine that additional boiling is necessary when the temperature falls below 45 ° C, and stop boiling when the detected temperature reaches, for example, 60 ° C or higher. The water temperature detectors (remaining hot water amount detectors) 7e, 7d and 7c have hot water up to the installation position of the remaining hot water detectors 7e, 7d and 7c when the detected temperature is 60 ° C. or higher, for example. Judge that there is no hot water. Chattering is prevented by using 45 ° C. and 60 ° C. as judgment temperatures.

  The heating means includes a heat pump cycle in which the compressor 10, the heat exchanger 6, the expansion valve 12, and the evaporator 11 are connected by piping. This heat pump cycle preferably uses carbon dioxide as a refrigerant and is operated in a state exceeding the critical pressure on the high pressure side. By using such a heat pump cycle, hot water close to 90 ° C. can be stored, and hot water storing about 65 ° C. considering Legionella bacteria can be stored at a high COP.

  An incoming water temperature detector 13 a is provided in the boiling pipe 4 leading to the heat exchanger 6, and a tapping temperature detector 13 b is provided in the boiling pipe 4 on the outlet side of the heat exchanger 6. In addition, the hot water storage type water heater according to the present embodiment includes an outside air temperature detector 13c that detects the outside air temperature.

  In the above configuration, during the boiling operation, the boiling pump 5 and the compressor 10 are operated.

  For example, when the boiling temperature is 90 ° C., the boiling pump 5 is adjusted to an appropriate flow rate and controlled so that the temperature of the tapping temperature detector 13b becomes 90 ° C. The temperature of the tapping water can also be controlled by controlling the heat pump cycle such as the rotational speed of the compressor 10 and the opening degree of the expansion valve 12. With the above operation, hot water of 90 ° C. is stored in the hot water storage tank 1 in order from the top, and when the incoming water temperature detector 13a detects 90 ° C., it is determined that the hot water of 90 ° C. has reached the lower part of the hot water storage tank 1, The raising pump 5 and the compressor 10 are stopped, and the boiling operation is finished.

  In the hot water storage type hot water heater according to the present embodiment, a first predetermined time zone and a second predetermined time zone are set. The first predetermined time zone is, for example, a midnight time zone from 23:00 to 7 o'clock, including a time zone in which the heating means is operated to perform a full-boiling operation, and includes a peak shift time zone. . The peak shift time zone is a time zone in which the entire amount boiling operation is waited. The second predetermined time zone is, for example, a daytime time zone from 7 o'clock to 23 o'clock, and is a time zone during which no full boiling operation is performed. In this second predetermined time zone, the additional boiling operation is performed when it is determined that the amount of hot water is insufficient in the total boiling operation. Moreover, the hot water boiling operation is performed in the peak shift time zone and the second predetermined time zone.

  The hot water storage type water heater of the present embodiment includes a remaining hot water amount calculation means 31 and a temperature detection means 32. The hot water temperature / capacity level changing means 33 sets the boiling water temperature and the capacity settings of the pump 5 and the compressor 10 based on signals from the remaining hot water amount calculating means 31 and the temperature detecting means 32. The boiling operation control unit 34 controls the capacities of the pump 5 and the compressor 10 based on the set contents in the hot water temperature / capacity level changing unit 33. The operation unit 35 has bath automatic setting means. When the setting is input by the bath automatic setting means, the operation unit 35 outputs a setting signal to the hot water temperature / capacity level changing means 33 and the automatic bath filling means 36. In response to this, an operation start signal is output. The automatic bath filling means 36 mixes the hot water from the upper part of the hot water storage tank 1 and the cold water from the water supply pipe 3 so that the hot water temperature is set in advance, and supplies a preset hot water amount to the bathtub 37. To do.

The remaining hot water amount calculating means 31 calculates the remaining hot water amount from the water temperature at each position in the hot water storage tank 1 detected by the water temperature detector 7, and sends a signal to the hot water temperature / capacity level changing means 33 and the boiling operation control means 34. Output. The temperature detection means 32 outputs the temperature signals detected by the incoming water temperature detector 13a, the outgoing water temperature detector 13b, and the outside air temperature detector 13c to the hot water temperature / capability level changing means 33 and the boiling operation control means 34.

  For example, when the remaining hot water amount calculating means 31 detects that the water temperature detectors (feed water temperature detectors) 7a and 7b have fallen below 45 ° C., the hot water temperature / capacity level changing means 33 determines that the total amount is being heated. It is set to the same boiling temperature (for example, 85 degreeC), and an additional boiling operation is performed. In this additional boiling operation, an operation signal is output from the boiling operation control means 34 to the pump 5 and the compressor 10 based on the set temperature. Further, the temperature detection means 32 detects the temperature of the hot water in the hot water temperature detector 13b, and the hot water temperature / capacity level changing means 33 causes the pump 5 so that the temperature of the hot water reaches a target boiling temperature (for example, 85 ° C.). And the capability of the compressor 10 is changed. Further, when the incoming water temperature at the incoming water temperature detector 13a is detected by the temperature detecting means 32 and this incoming water temperature reaches the target boiling temperature (for example, 85 ° C.), the boiling operation control means 34 causes the pump 5 and the compressor 10 to be heated. Stop driving. The outside air temperature at the outside air temperature detector 13c is detected by the temperature detecting means 32, and the target boiling temperature is set and changed according to the outside air temperature.

  On the other hand, when the remaining water amount calculation means 31 detects that the water temperature detectors (remaining hot water amount detectors) 7e, 7d, and 7c have fallen below 45 ° C., the hot water temperature / capacity level changing means 33 performs a total boiling operation. The boiling temperature is set lower than that (for example, 65 ° C.), and the hot water boiling operation is performed. In this hot water boiling operation, an operation signal is output from the boiling operation control means 34 to the pump 5 and the compressor 10 based on the set temperature. Also, the temperature detection means 32 detects the temperature of the hot water at the hot water temperature detector 13b, and the hot water temperature / capacity level changing means 33 causes the pump 5 so that the hot water temperature becomes a target boiling temperature (for example, 65 ° C.). And the capability of the compressor 10 is changed. When it is detected by the water temperature detectors (remaining hot water amount detectors) 7e, 7d, 7c that a predetermined amount of hot water has been stored, the heating operation control means 34 stops the operation of the pump 5 and the compressor 10. .

  Further, when the hot water in the hot water storage tank 1 is decreased by the automatic bath filling means 36 and the remaining hot water amount calculating means 31 detects that the water temperature detectors (remaining hot water amount detectors) 7e, 7d, 7c are below 45 ° C. The hot water temperature / capacity level changing means 33 sets the boiling temperature to a lower temperature (for example, 65 ° C.) than that during the total boiling operation, and the hot water boiling operation is performed as described above. In this case, the hot water boiling operation is performed during a bath automatic hot water operation time zone.

  In the bath automatic hot water operation, since the hot water temperature and the amount of hot water supplied to the bath are set in advance, before performing hot water detection by the water temperature detectors (remaining hot water amount detectors) 7e, 7d, 7c, It is preferable to perform a hot water boiling operation. That is, the remaining hot water amount calculating means 31 uses the amount of hot water supplied to the bathtub 37 by the automatic bath filling means 36 and the hot water storage amount detecting means (water temperature detectors) 7a, 7b, 7c, 7d, 7e provided in the hot water storage tank 1. Based on the detected hot water storage amount, the remaining hot water amount after the completion of the automatic bath filling operation is calculated in advance, and the hot water boiling operation is performed before the completion of the automatic bath filling operation. Can be reliably prevented.

  Although not shown, the hot water amount setting level of this embodiment is provided with a plurality of hot water amount setting levels such that level 1 has the lowest hot water amount level and level 10 has the highest hot water amount level.

For example, in the hot water amount setting levels 1 to 3, the minimum boiling temperature (65 ° C.) is set, and the time limit for additional boiling operation is varied. That is, at the hot water amount setting level 1, it is set so that no additional boiling operation during the day is performed. At the hot water setting level 3, the daytime additional boiling operation is set to be performed for a cumulative period of up to 2 hours.

  In addition, in the hot water amount setting levels 4 to 10, the boiling temperature is set to be changed depending on the outside air temperature.

  Next, the control flow of the hot water storage type water heater of the present embodiment will be described with reference to FIG.

  First, the boiling water temperature / capacity is determined by the hot water temperature / capacity level changing means 33 (step 1). It is then determined from the current time whether it is a daytime time zone (second predetermined time zone) (step 2). If the present time is the second predetermined time zone, it is determined whether or not the temperature detected by the remaining hot water detectors 7c, 7d, and 7e is lower than the predetermined temperature (step 3).

  In step 3, when the temperature detected by the remaining hot water detectors 7c, 7d, and 7e is not lower than the predetermined temperature, the remaining hot water monitoring is continued (step 4). In step 3, when the temperature detected by the remaining hot water detectors 7c, 7d, and 7e falls below a predetermined temperature, the hot water temperature / capacity level changing means 33 causes the hot water temperature to be raised at the time of boiling operation. The temperature is lower than the temperature (for example, the minimum boiling temperature (65 ° C.)) and the capacity of the compressor 10 is changed to a capacity (for example, 9 kW) higher than the capacity (for example, 4.5 kW) during the entire boiling operation (for example, 9 kW) ( Step 5), a hot water boiling operation is performed (step 6).

  Then, it is determined whether or not the temperature detected by the remaining hot water detectors 7c, 7d, 7e exceeds a predetermined temperature (step 7).

  In step 7, when the temperature detected by the remaining hot water detectors 7c, 7d and 7e does not exceed the predetermined temperature, the hot water boiling operation is continued (step 6). If it is determined in step 7 that the temperature detected by the remaining hot water detectors 7c, 7d, and 7e exceeds a predetermined temperature, the hot water boiling operation is stopped (step 8).

  If it is determined in step 2 that it is not the second predetermined time zone, it is determined whether or not it is a peak shift time zone (step 9).

  If it is determined in step 9 that it is the peak shift time zone, it is determined whether or not the temperature detected by the remaining hot water detectors 7c, 7d, and 7e is lower than a predetermined temperature (step 10).

  If the detected temperature in the remaining hot water detectors 7c, 7d, 7e is higher than the predetermined temperature in step 10, the remaining hot water monitoring is continued (step 11). In step 10, when the temperature detected by the remaining hot water detectors 7c, 7d, and 7e is lower than the predetermined temperature, the hot water temperature / capacity level changing means 33 raises the boiling water temperature in the boiling operation during the entire heating operation. The temperature is lower than the temperature (for example, the minimum boiling temperature (65 ° C.)) and the capacity of the compressor 10 is changed to a capacity (for example, 9 kW) higher than the capacity (for example, 4.5 kW) during the entire boiling operation (for example, 9 kW) ( Step 12), hot water boiling operation is performed (step 13).

  Then, it is determined whether or not the temperature detected by the remaining hot water detectors 7c, 7d, and 7e exceeds a predetermined temperature (step 14).

  If the detected temperature in the remaining hot water detectors 7c, 7d, 7e does not exceed the predetermined temperature in step 14, the hot water boiling operation is continued (step 13). If it is determined in step 14 that the temperature detected by the remaining hot water detectors 7c, 7d, 7e exceeds a predetermined temperature, the hot water boiling operation is stopped (step 15).

  If it is determined in step 9 that it is not the peak shift time zone, it is determined whether or not the temperature detected by the feed water temperature detecting means 7a, 7b has reached the predetermined temperature at the end of the second predetermined time zone ( Step 16).

  If it is determined in step 16 that the detected temperatures of the feed water temperature detecting means 7a and 7b have not reached the predetermined temperature, the whole amount boiling operation is performed as planned (step 17). If it is determined in step 16 that the temperature detected by the feed water temperature detecting means 7a, 7b is equal to or higher than the predetermined temperature, the whole amount boiling operation is not performed (step 18).

  Next, the control flow at the time of bath hot water filling operation in the hot water storage type hot water heater of the present embodiment will be described with reference to FIG.

  First, it is determined whether or not the bath automatic setting means has been set by the operation unit 35 (step 21). If it is determined in step 21 that bath hot water is started, it is determined whether or not the temperature detected by the remaining hot water detectors 7c, 7d, and 7e is lower than a predetermined temperature (step 22).

  If the detected temperature in the remaining hot water amount detectors 7c, 7d, 7e is higher than the predetermined temperature in step 22, the remaining hot water monitoring is continued (step 23). In step 22, when the temperature detected by the remaining hot water detectors 7 c, 7 d, and 7 e falls below a predetermined temperature, the hot water temperature / capacity level changing means 33 causes the boiling water temperature to be raised at the time of the entire boiling operation. The temperature is lower than the temperature (for example, the minimum boiling temperature (65 ° C.)) and the capacity of the compressor 10 is changed to a capacity (for example, 9 kW) higher than the capacity (for example, 4.5 kW) during the entire boiling operation (for example, 9 kW) ( Step 24), hot water boiling operation is performed (step 25). Then, it is determined whether the bath hot water operation has been completed (step 26). If the bath hot water operation has not been completed, it is further determined whether the bath hot water operation has been completed (step 26). ). If it is determined in step 26 that the bath hot water operation has been completed, the hot water boiling operation is also stopped (step 27).

  Next, the operation | movement at the time of the hot water boiling heating operation of the hot water storage type water heater of a present Example is demonstrated using FIG.4 and FIG.5. FIG. 4 is a conceptual diagram for explaining the hot water boiling operation according to this embodiment, and FIG. 5 is a conceptual diagram for explaining the hot water boiling operation during bath hot water filling operation according to this embodiment.

  First, as shown in FIG. 4, the whole amount boiling operation is performed in a first predetermined time zone (midnight time zone). In this total boiling operation, the boiling set temperature is 85 ° C., and the boiling capacity in the compressor 10 is performed at a rated 4.5 kW. In the case of running out of hot water using hot water in the hot water storage tank 1 during the day and night time, in the comparative example, the boiling setting temperature is 85 ° C. and the boiling capacity of the compressor 10 is 5 kW. The case is shown in which the set temperature is 65 ° C. and the compressor 10 is heated to 9 kW. In the comparative example, the hot water boiling operation takes about 50 minutes, whereas in this example, the boiling can be completed in 27 minutes.

  In FIG. 5, in the comparative example, the boiling set temperature is 85 ° C., the boiling capacity of the compressor 10 is 5 kW, and in this embodiment, the boiling set temperature is 65 ° C. and the boiling capacity of the compressor 10 is 9 kW. In addition, in the comparative example, the hot water boiling operation is started after completion of the automatic bath filling operation, whereas in this embodiment, the hot water boiling operation is started simultaneously with the start of the automatic bath filling operation. Yes. In the comparative example, it takes about 50 minutes for the hot water boiling operation, whereas in this embodiment, the boiling is finished when the hot water filling automatic operation ends.

Although the hot water temperature / capability level changing means 33 in the present embodiment has been described as setting the boiling temperature during the hot water boiling operation to a temperature lower than the boiling temperature during the full boiling operation, The boiling temperature at the time of hot water boiling operation may be set to a temperature lower than the hot water temperature stored in the upper part of the hot water tank. You may set so that the supply amount by a boiling pump may increase.

  Further, in the hot water boiling operation in the present embodiment, the hot water temperature / capacity level changing means 33 sets the boiling water temperature to a temperature lower than the boiling temperature in the total boiling operation and the capacity of the compressor 10. As explained in the case of changing to a capacity higher than the capacity during full boiling operation, the capacity of the compressor 10 remains the same as the capacity during full boiling operation, and the boiling water temperature is increased during full boiling operation. The temperature may be lower than the boiling temperature.

  Moreover, a predetermined amount of hot water can be stored at an early stage by setting the hot water temperature during the hot water boiling operation to the lowest temperature among the hot water setting temperatures.

  In addition, the storage time of a predetermined amount of hot water can be further shortened by increasing the capacity of the compressor 10 during the hot water boiling operation rather than during the full amount boiling operation. In addition to the rotation speed of the machine 10, it can also be performed by control in the heat pump cycle such as the opening degree of the expansion valve 12.

  The hot water storage water heater of the present invention is particularly useful for a hot water storage water heater that uses a heat pump cycle using carbon dioxide as a refrigerant, and can also be applied to a hot water storage water heater that uses a heater or gas as a heat source.

The block diagram of the hot water storage type water heater by one Example of this invention Control flow diagram of the hot water heater Control flow chart at the time of bath hot water operation in the hot water storage type water heater of this embodiment Conceptual diagram for explaining hot water boiling operation according to this embodiment Conceptual diagram for explaining hot water boiling operation during bathing operation according to this embodiment

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Hot-water supply pipe 3 Water supply pipe 4 Boiling piping 5 Boiling pump 6 Heating means (heat radiator)
7a Water temperature detector 7b Water temperature detector 7c Remaining hot water amount detector 7d Remaining hot water amount detector 7e Remaining hot water amount detector 10 Compressor 11 Evaporator 12 Expansion valve 31 Remaining hot water amount calculating means 32 Temperature detecting means 33 Hot water temperature / capability level changing means 34 Boiling operation control means 35 Operation section 36 Bath automatic hot water filling means 37 Bathtub

Claims (2)

A hot water storage tank, a hot water pipe provided in the upper part of the hot water storage tank, a water supply pipe provided in the lower part of the hot water storage tank, a heating pipe for guiding water in the lower part of the hot water storage tank to the upper part, and provided in the heating pipe a pump boiling was, a heating means for heating the water supplied by the water heating middle to boiling the provided pump piping, and the remaining hot water calculating means to calculate the amount of hot water the hot water storage tank, An operation display unit that performs an operation instruction and a status display of the heating unit, and a bath automatic hot water filling unit that supplies a predetermined amount of hot water to the bathtub ,
Sets the time zone to perform a total volume boiling operation, set the boiling hot water out to perform the operation when calculating a predetermined remaining hot water in the remaining hot water calculating means, when boiling the total amount within the rated capacity range A hot water heater that operates in a power operation mode that operates in a rated operation mode that heats water and heats water within a capacity range that exceeds the rated capacity when boiling out of the hot water,
At the time of bath automatic hot water filling operation, even if the remaining hot water amount calculating means does not detect running out of hot water, the hot water amount supplied to the bathtub by the automatic bath hot water filling means and the hot water storage amount detecting means provided in the hot water storage tank Based on the amount of hot water remaining after the completion of the automatic bath filling operation calculated from the detected hot water storage amount, the hot water boiling operation is performed before the completion of the automatic bath filling operation, and the operation is performed in the power operation mode . The hot water heater is characterized in that the operation display section displays that the power operation mode is in progress. The boiling temperature of the power over the operating mode, the hot water storage type water heater according to claim 1, characterized in that below the temperature at boiling during rated operation mode.

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