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You can either run your water heater on propane, 120v electric or both at the same time for a really long shower. We usually run ours on the free electricity supplied at parks. Your furnace has to have 12v for the controls and blower motor, but needs propane for heat.
Several years ago after spending the winter on Texas and Arizona hard water, ours would only get warm and not hot while running on electric. I removed the heating element and it was all caked with crud. A trip to Home Depot and $17.00 later we were back in business.
Good luck, Bill
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