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Well I dont know if you'd want to do this but if you found the outside shutoff and drained the system when you're not using it you dont need a heater, just blow air through the system for a minute to flush out the water, alternately extreme case you could jerry jug water from home to use for the john , etc , then follow it with the RV antifreeze for a rinse, tc, extreme sounding but should work, good luck , would be way to go if it gets really cold
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