| 摘要 |
PURPOSE:To make it possible to supply hot water into a bathtub in a state where a lid is closed thereby to realize an energy-saving hot water supply by enabling introduction of hot water having a suitable temperature obtained in an instantaneous water heater through a circulation heating circuit of the bath. CONSTITUTION:The tip end of a hot water supply pipe 19 is commanicated with the downstream side of a check valve 20. Further, a water quantity sensor 21 is provided between a switching valve 16 and a vacuum break valve 17. A return pipe 15 and an outgoing pipe 11 from a circuit for circulation and have each a diameter smaller than the diameter of a hot water feed pipe 6a. Further, the composite type hot water feeder is installed at a position which is higher than that of the bathtub 12. Since the check valve 20 is provided in the circulation circuit, hot water is prevented from being introduced to the heat exchanger side of the bath furnace at the time of a hot water supply and also from radiation loss. Further, by closing the switching valve 16 air is taken in through the vacuum break valve 17 and is mixed into the hot water feed pipe, whereby hot water within the bathtub is prevented from counterflowing to the side of the instantaneous water heater 1. |
