As a general rule, most rvs have a heat duct that runs into the tank area in the basement. If you run your furnace for a bit, then open the doors in that area, you should feel some heat in there. By and large, as long as you have some heat down there, the tanks wont freeze unless it gets below freezing for several days. If planning on leaving your rv unwinterized into the winter, you may want to consider adding extra heat below, and taking more proactive measures to prevent damage to the rv water systems.
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2000 coachmen santara 370 5.9 cummins isb
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