| 摘要 |
PROBLEM TO BE SOLVED: To provide a bath hot water supply device capable of preventing erroneously detecting that a drain plug of a bathtub is left unclosed, and capable of suppressing an amount of hot water drained when the drain plug is left unclosed.SOLUTION: In an initial hot water filling, a hot water supply amount (initial hot water amount) until hot water in a bathtub exceeds reference height is detected and stored. In normal hot water filling after that, it is determined that abnormality has occurred in a drain plug of the bathtub on the basis of the fact that the hot water in the bathtub has not reached the reference height when the hot water of the initial hot water amount is supplied, and in that case, the initial hot water filling is performed in the next hot water filling time, and the initial hot water amount is detected once again. Thus, even when the initial hot water amount is wrong (less than the actual amount), the mistaken amount is not continued to be used as it is, so that it can be prevented that the drain plug abnormality is erroneously detected every time normal hot water filling is performed. Also, as the initial hot water amount does not need to be corrected, the initial hot water amount is not mistakenly preset to be larger than usual, and the hot water amount drained wastefully at the time of abnormality in the drain plug can be suppressed. |
