As was stated above - you need to run the furnace to heat the basement area to keep the water and tanks from freezing. Cheap heat goes in the plenium of the furnace as I recall and then the heater fan distributes that head just as if you were burning propane. Cost of electricity is a concern of course but I expect its cost will be quite a bit less than having to have the bottom panels removed and a broken water line (with all of its associated insulation damage) repaired. I agree that during the daytime when O/S temps are above freezing, use of the fireplace or small electrical heaters is nice. But at night, or if daytime temps are 32 f or below, run the furnace.
Just my .02.
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