| 摘要 |
PROBLEM TO BE SOLVED: To increase a circulation flow rate of hot water with respect to a heating radiator without adversely affecting pressure tightness and durability of a heat exchanger, and to prevent energy loss due to heat dissipation in the heat exchanger in a hot water heating system provided with a heat source machine 1 having the heat exchanger heated by a burner 4, and the heating radiator 2, and circulating hot water heated by the heat exchanger between the heating radiator and the heat exchanger via a circulation passage. SOLUTION: The circulation passage is divided into a first circulation passage 8 between the heat exchanger 5 and a cistern 7, and a second circulation passage 9 between the cistern 7 and the heating radiator 2, and hot water is circulated through each of the first and second circulation passages by individual pumps 10 and 11. When a temperature of the hot water supplied to the heating radiator 2 is raised to an extinction temperature, combustion of the burner 4 is stopped, and then, after waiting for a delay necessary for preventing after-boiling in the heat exchanger 5, the pump 10 for the first circulation passage is stopped. COPYRIGHT: (C)2007,JPO&INPIT
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