| 摘要 |
PURPOSE:To enable to quickly bring the temperature of supplying hot water back to the set temperature even when the flow rate of supplying hot water suddenly changes. CONSTITUTION:A controller 5 calculates the controlling quantity of a control valve CV sending to a burner 1 based upon the signals of a flow sensor FS and of a temperature sensor TH1, both of which are provided at the inlet side of a heat exchanger 2, and the set value. When supplying hot water temperature measured by a temperature sensor TH2 provided at the outlet side of the heat exchanger 2 is below the set value, the output signal of the inlet temperature sensor TH1 is shifted to the value corresponding to a temperature lower than the actual temperature. |
