| 摘要 |
PROBLEM TO BE SOLVED: To easily and surely identify service destinations (calling destinations) of respective remove operation devices used in a service system of a hot-water feeder. SOLUTION: In a hot-water feeder system comprising remote operation devices 2a, 2b and 2c and a communication cable 3, with which the devices 2a, 2b and 2c are connected to the hot-water feeder 1, service means 21 for calling the other remote operation devices 2 are provided in the respective remote operation devices 2 to constitute a service system. The names of the other remote operation devices which can be called by the service means 21 are indicated on the indication means 23 of each remote operation device 2, and through making the display recognized visually, the remote operation device of the call destination is selected by an operation means 22.
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