| 摘要 |
PROBLEM TO BE SOLVED: To provide a bath device with a water heater, which is prevented from elongating the time period till a bathtub is filled supplied with hot water.SOLUTION: A bath device comprises an additional firing circuit 11 connected to a bath 4 and including: drain reserving means 37 capable of being connected via a connection passage 27 to a hot water supply circuit for pouring the bathtub with hot water from the hot water supply circuit thereby to reserve the drain generated by a heat exchanging part 7 of the hot water supply circuit, into a predetermined quantity; drain discharge control means having a drain lead-out passage 42 for guiding the drain to the circuit, to discharge the drain to the outside of an additional burning circuit when the drain storage quantity exceeds a predetermined quantity. After the discharge of the previous drain, there is calculated the total value by adding, to a second drain generation amount which is expected to occur when a second hot water supply is performed, a first drain generation amount which occurs when the time period estimated as the time period from the previous hot water supply to the time before a next water supply starts. The drain is forcibly discharged on condition that the total value exceeds a predetermined quantity. |
