Like mentioned a gravity furnace would be the best unless it gets too cold for the propane to vaporize. I heat my garage with a wood stove during the day and turn on my diesel heater at night and it uses a couple of liters over night. Because power is no issue it works well but only has a 4 liter tank. Garage is 25'x26' with a vaulted ceiling with 10 foot walls and stays quite comfortable.
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