| 摘要 |
PURPOSE:To reduce the over-shooting of heating and consequently prevent the danger of causing a scald from occurring by a structure wherein a flow switch is provided at the downstream side of a heat exchanger and low level combustion is rendered to be realized for the predetermined period of time when flow decreases. CONSTITUTION:The flow switch 9, which consists in providing a magnet float 10 in a water flow part and a low flow rate reed switch 11 and a high flow rate reed switch 12 arranged on the side wall at vertically different positions from each other, is provided at the downstream side of the heat exchanger. Furthermore, when flow decreases, the rate of combustion of a burner is rendered to be brought down to the low level or the minumum gas flow rate. |
