| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot-water supply system capable of giving preliminary announcement on boiling-up at a proper timing even when a hot-water pouring temperature is lowered than a bath set temperature in supplying the hot-water into a bathtub in an automatic hot-water supply mode. SOLUTION: A hot-water supply unit 20 having a function to automatically supply the hot-water into the bathtub, supplies the hot-water by utilizing the preheated hot-water supplied from a heat storage tank 14 of a solar energy utilization water heater 10. When the hot-water supply unit 20 supplies the hot-water into the bathtub in the automatic hot-water supply mode, the preliminary announcement is performed in a hot-water pouring stage or a reheating stage thereafter, and in the hot-water pouring stage, the total reheating time Tf is calculated in a period of one second while considering a hot-water pouring remaining time Tz, and the reheating calories G1 to the amount of poured hot-water in each point of time, and the preliminary announcement on boiling-up is performed at a time when the sum of the hot-water pouring remaining time Tz and the total reheating time Tf in each point of time becomes within 2.5 minutes, and the hot-water pouring remaining amount Qz becomes within 20 % of the initial necessary hot-water pouring amount Qi. COPYRIGHT: (C)2004,JPO
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