| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water heating system and a circulated hot water temperature control method, superior in durability of a heat source machine, energy saving property of the system, and silence without impairing amenity. SOLUTION: A hot water temperature becomes lower in accompany with the stop of combustion. During the lowering, a prescribed time t1 has passed from the stop of the operation of a circulation pump or not is determined (Step S109). When the time is within t1, this state is kept as it is (NO in S109). When the prescribed time t1 has passed (YES in S109), the operation of the circulation pump 7 is restarted (step S110). Further, whether the temperature is lower than a set temperature Ts or not is determined (step S111). When the temperature is Ts or more, the state is kept as it is (NO in S111). When the temperature is lower than Ts (YES in S111), the combustion of a burner is restarted (step S112). COPYRIGHT: (C)2007,JPO&INPIT
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