| 摘要 |
PROBLEM TO BE SOLVED: To achieve miniaturization of a system by simplifying a hot water circulation circuit by eliminating a dedicated circulation tank, to make high temperature hot water storage possible, and, even when the hot water temperature in the hot water circulation circuit including a hot water storage tank for circulation drops, to effectively use it as hot water to be supplied.SOLUTION: A hot water supply system 1 includes: a heat source machine 2; at least two or more hot water storage tanks 3A and 3B connected with each other in series; and a hot water circulation circuit 4 connected to the hot water storage tank 3A on the uppermost stream side via a hot water tapping pipe 12 and a mixing valve 13, and having one or more hot water supply terminals 5. The hot water circulation circuit 4 includes hot water return piping 4C for returning a constant amount of circulation hot water to a bottom part of the specific hot water storage tank 3A. The hot water return piping 4C includes: return piping 4D which detects the hot water temperature in the specific hot water storage tank 3A and, when the temperature drops to a preset temperature or lower, returns the circulation hot water to a bottom part of the hot water storage tank 3B which is on the lower stream side than the specific hot water storage tank 3A; and switching valves 17 and 18. |
