送交者: meteor 于 2005-5-20, 13:55:54:
回答: about 一打开热水龙头就有热水 由 silxirt 于 2005-5-19, 16:35:44:
The hot water will come instantly (almost).
There is no water left in the hot water pipe. A sensor and small pump is installed. When you turn on the hot water, the pump immdiately drives hot water to the outlet.