| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the problem in which, when boiling end temperature is changed to low temperature, boiling is completed earlier than midnight time zone end time.SOLUTION: A hot water storage type water heater includes: heating means 33 provided in the middle of a heating circulation circuit 22 and for heating hot water; a boiling end temperature sensor 11e provided on a side surface of a hot water storage tank 1 and for detecting whether or not hot water storage temperature has reached predetermined boiling end temperature; boiling start time calculation means 41 for calculating boiling start time so as to complete boiling of a boiling necessary amount at midnight time zone end time; boiling control means 40 for starting a boiling operation for boiling the hot water to target boiling temperature when the boiling start time comes and for ending the boiling operation when the boiling end temperature sensor 11e has detected the predetermined boiling end temperature; and boiling end temperature change means 42 for changing predetermined boiling end temperature. The boiling start time calculation means 41 corrects the boiling start time according to the change of the boiling end temperature by the boiling end temperature change means 42.</p> |
