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Brouck
If it was winterized and there was no problem with tanks and lines freezing. Catalytic heaters usually don't get much over 6000 BTU which is not much when it starts getting below freezing. With 2 aluminum skins connected by aluminum ribs and only 1 1/2" between for insulation you can't expect a very high R factor, it is going to take a fair amount of propane to heat in cold temps.
John
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