| 摘要 |
PROBLEM TO BE SOLVED: To provide a water heater which keeps hot water from flowing into a circulation system of a heat radiator from a bathtub even when any one of a plurality of changeover valves for switching a circulation path in a water heater with a bathtub circulation system and the circulation system of the heat radiator. SOLUTION: In this water heater with a bathtub circulation system 3 and a circulation system 5 of a heat radiator, a branch part and a convergent part respectively in both the circulation systems are provided with a first changeover valve 86 and a second selector valve 88 and a check valve 98 is provided between an expansion tank 80 and the second changeover valve 88 in the circulation system 5 of the heat radiator while it is judged whether the selector valves 86 and 88 are troubled or not during the switching operation. When the first selector valve 86 is troubled, the second selector valve 88 is forced to be on standby on the circulation side of the heat radiator. When the second selector valve 88 is troubled, the first changeover valve 86 is forced to be on standby. |
