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• MWH-180EX requires 120V AC at 60Hz.
Disconnect the power supply if the unit is not in use for a long time.
• Remove residual water in the unit when the power supply is off because the freeze prevention
in the unit will not activate, resulting in possible freezing damage.
• Do not let the power cord contact the gas piping.
• The grounding screw is located in the junction box attached to the outside of bottom plate.
• To prevent electrical shock, provide a ground with resistance less than 100. An electrician
should do this work.
Power supply lead wire
Junction box
Ground terminal
(Grounding screw)
Surge protector
Power supply lead wire
(Black-hot/White-neutral)
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