| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve both suppression of delay in restart of hot water supply operation and suppression of deterioration of hot water tapping temperature, at the time of hot water re-tapping after stop of hot water tapping in an operation ON state, even when inflow water pressure to a hot water supply device is low.SOLUTION: When hot water tapping is stopped while a hot water supply device is in an operation ON state, an opening of a water amount adjusting valve is set at a standby opening P1. At the time of hot water re-tapping by faucet operation of a user and the like, when a flow rate Q reaches a minimum operation flow rate MOQ, hot water supply operation is started. In the case where the flow rate Q is lower than the MOQ, when a state in which the flow rate Q exceeds a detection threshold value of a low flow rate Q*(Q*<MOQ) continues for a certain time T1, the opening of the water amount adjusting valve is set at a standby opening P2 in which the flow rate increases more than that of the standby opening P1, and comparison between the flow rate Q and the MOQ is performed.</p> |
