| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water supply device to disconnect a feed of a power source to a circuit not to need a feed of a power source during a hot water supply stand-by state. SOLUTION: Branch points Y1 and Y2 at which a DC source output fed from a source means is branched into at least two or more source routes are arranged on a control substrate 1 to feed a drive source to an electric accessory and a source cutoff circuit 4 is arranged on at least one route of the branched source routes. An electric accessory which may disconnect a feed of a power source when a hot water supply device is in a stand-by state is connected to the source cutoff circuit 4. An accessory, for example, a microcomputer 3 and a water quantity sensor A having a need to continue a source feed even when the hot water supply device is in a stand-by state is connected to other source route. When the hot water supply device is in a stand-by state, the source cutoff circuit 4 is operated by outputting a control signal from the microcomputer 3 to disconnect a feed of a power source to the accessory connected to the source cutoff circuit 4.
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