| http://www.w3.org/ns/prov#value | - The radio remote control unit 5 includes a remote control unit radio communication circuit 50 which performs radio communication with the relay apparatus 1, a remote control unit switch section 51 which remotely operates the water heater main body 3, a remote control unit display section 52 which displays information such as operational information at the remote control unit switch section 51 and
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