| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress post-boiling by a pilot burner in a hot-water supply heat exchanger upon re-tapping hot water after hot-water supply is once stopped. <P>SOLUTION: A pilot burner 38 for a pilot flame is disposed between a hot-water supply main burner 10 and a bath main burner 39, and the pilot flame is used to ignite the main burners 10, 39. After combustion on the main burners 10, 39 is stopped, combustion on the pilot burner 38 is continued until an extinguishing operation is carried out. A plurality of fins 3 are arranged on a main heat exchange conduit 4 in a hot-water supply heat exchanger 7, the fins arranged as spaced apart from one another in the longitudinal direction of the main heat exchange conduit 4. The main heat exchange conduit 4 is arranged in such a way that the conduit starts, as a water inlet 1, at the end of the heat exchanger 7 right above the hot-water supply main burner 10 closer to the pilot burner 38, passes over the end and meanders in the hot-water supply heat exchanger 7, toward a water outlet 2 at an end in the opposite side heat exchanger 7, farther from the pilot burner 38. <P>COPYRIGHT: (C)2012,JPO&INPIT |
