| 摘要 |
PROBLEM TO BE SOLVED: To provide an interphone system wherein a master unit of the interphone system in a user's house monitors an operating state of a water heater and operates the water heater. SOLUTION: An interphone unit 6b in the bath room BR makes a two-way speech with a main master unit 3 and a sub-master unit 5 in the interphone system installed in the user's house, and a television camera attached interphone slave unit 1 installed at an entrance or the like, and a user operates a water heater 8 on an operating menu of a display apparatus 37 of the main master unit 3 and a display apparatus 60 of the sub master unit 5. Further, the user monitors a state of a hot water level of a bath on the screen of the display apparatuses 37, 60. COPYRIGHT: (C)2004,JPO&NCIPI
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