PURPOSE: To make the temperature of hot water in a hot water storage tank uniform by a method wherein in the titled hot water feeder provided with an auxiliary heat source, the high temperature hot water produced by the auxiliary heat source is introduced into the upper part of the hot water storage tank so as to enable the high temperature hot water to be stored in the tank in a short time and in small quantities and also to enable it to circulate by a pump.
CONSTITUTION: A hot water circulating passage connecting the hot water storage tank 1 and a solar heat collector 2 includes a route stating from the upper part of the tank 1 and ending with the lower part of the tank 1 via the pump 6, a first electromagnetic valve 12, a forward pipe 4, the solar heat collector 2 and a backward pipe 5 and a route starting from the pump 6 and ending with the lower part of the tank 1 via a second electromagnetic valve 13 provided midway in a bypass pipe 18 connected to the backward pipe 5 at a part just before the valve 13. With the above structure, when solar heat is collected, the water in the upper part of the tank 1 is supplied to the solar heat collector 2 by the pump 6 after the valve 12 is opened and the valve 13 is closed and the hot water is introduced into the lower part of the tank 1. Further, in case where it is required to heat the hot water additionally by the auxiliary heat source 3, the hot water in the tank 1 is circulated by the pump 6 after the valve 12 is closed and the valve 13 is opened, to thereby heat the hot water to an elevated temoerature uniformly and quickly.
FUJISHITA KAZUO
SUGANO TADAO
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