| 摘要 |
PURPOSE:To reduce the cost of manufacturing a hot water boiler by arranging a burner at the top of a main boiler in which the second heat exchanger is provided and room heating hot water outlet and inlet at the bottom of the main boiler and disposing the second hot water inlet at the top of the heat exchanger. CONSTITUTION:A burner 2 is arranged at the top of a main boiler 1 in which the second heat exchanger 5 is provided, room heating hot water outlet 6 and inlet 9, between which a pump 7 is connected are arranged at the bottom of the main boiler, and the second hot water inlet 13, to which a pump 12 is connected, is disposed at the top of the heat exchanger 5. When the heat exchanger 5 is used for supplying hot water, heating hot water 3B is circulated from the outelt 6 to the inlet 9, thereby utilizing most of the heat from the burner 6 for the heat exchange for supplying the hot water. On the other hand, when the hot water supply is stopped, the hot water 3B is circulted from the outlet 6 to the inlet 9, and the pump 12 is operated to also circulate the hot water 3A from the outlet 6 to the inlet 13, thereby equalizing the temperature of the hot water 3 in the main boiler 1 and utilizing the heat from the burner 2 for room heating. Thus, since the heat from the burner 2 can be reduced, the size of the boiler can be reduced. |
