| 摘要 |
PURPOSE:To make it possible to immediately supply hot water even if the water tap of a shower is reopened by circulating hot water to a bypass channel even if the tip of a shower is once closed while having a shower. CONSTITUTION:A water solenoid valve 12 which is closed and a water solenoid valve 13 which is opened, and a pump of which operation is started when a water flow switch 2 is closed by closing a tap 1 through which hot water has been discharged by way of an opened hot water supply passage 5, are provided. Furthermore, a water flow switch 15 operating by the action of a pump 14, a heat exchanger 20 for heat-exchanging the quantity of heat of hot water circulating by the pump 14 with water in a water supply path 3, and a bypath channel 16 consisting of the valve 13, the pump 14, the switch 15 and the heat exchanger 20 and connecting the inlet and outlet of the heat exchanger 4 to each other are provided. Further, a combustion controller 11 closes the valve 12, solenoid valve 6 and solenoid valve 17 by a signal from the switch 2 or a signal from a water flow switch 19 emitted when the water tap which has once closed is reopened within a predetermined period of time, and ignites the burner by an igniter 9 to control the combustion. |
