Chuck is correct. It is for the water heater when you do not want to use propane, and you are hooked up to shore power, you turn that switch on and your water heater will supply hot water just like it did when on propane. But like Chuck posted, make sure there is water in the water heater before turning it on or you could burn up the element.
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2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox
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