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Reviving this thread to address my situation. Coaches are stored indoors in a well insulated individual stalls. Owner of storage facility said that it generally does not get below about 40 degrees in the stalls. Coaches stay plugged into 50 amp year around so my thought was to turn on electric Aquahot and add additional small heating elements in any areas recommended by folks here. Thoughts?

Would prefer to not go the pink antifreeze in fresh tank/lines if at all possible.