| 摘要 |
<P>PROBLEM TO BE SOLVED: To ensure the use of hot water during taking a bath without wasting hot water supply, in a combustion device draining the condensate water generated in a heat exchanger for collecting latent heat, to the bathtub. <P>SOLUTION: A condensate water drain means 40 comprises a collecting tray 41 disposed below a sub-heat exchanger 8 for collecting latent heat and collecting the condensate water falling from the sub-heat exchanger 8, a drain circuit 42 connected between the collecting tray 41 and a bathtub hot water supply circuit 75, and a drain tank 44 disposed in the drain circuit 42. A control means 60 calculates the hot water supply amount necessary to a set water level on the basis of a bathtub water level from a bathtub water level sensor when an automatic operation switch is on, and determines whether a hot water supply mode should be executed or not before start of the automatic operation, on the basis of at least the calculated hot water supply amount and a storage state of the condensate water in the drain tank 44. <P>COPYRIGHT: (C)2009,JPO&INPIT |
