| http://www.w3.org/ns/prov#value | - 5) The display panel 19 of the relay apparatus 1 displays maintenance information, but the display panel 19 may also display information such as operation information of the radio remote control unit 5 and operational information of the water heater main body 3 obtained by relay of communication between the radio remote control unit 5 and the water heater main body 3, and various information (e.g.
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