| 摘要 |
PURPOSE:To enable to feed hot water at a given temperature at all times, by a method wherein, in a device which feeds hot water from a hot water tap through the circulating of hot water in a hot water storage tank by means of a pump, circulating water is fed to a hot water feed tank for heating only when the temperature of the circulating water is lowered by a given temperature or over than a hot water temperature set by a setter. CONSTITUTION:A mixing valve 9 for mixing hot water and water, a circulating pump 3 and an electromagnetic valve 10 are mounted, in order, to a closed circuit 8 for a hot water feed and circulation extending via a hot water feed tank 1 heated by a burner 7, and water feed pipe 5 havig a check valve 4 located on the midway thereof is connected to a flow-in side 1b of the hot water feed tank 1 and the mixing valve 9. A temperature detecting means 11 is provided to the flow-out side of the mixing valve 9, while a circulating passage 12, connected to the discharge side of the pump 3, is provided between said means 11 and the mixing valve 9. The output signal from the temperature detecting means 11 is inputted to a valve controlling means 13, and only when the temperature of mixture water is lowered by a given temperature or over than a hot water feed temperature set by a temperature setter 14, the opening of the mixing valve 9 is controlled so as to feed a part of circulating water to the hot water feed tank 1. |
