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| The size of an outdoor furnace should be matched to the requirements. All manufacturers use either a BTU rating or square footage capabilities. Since BTU's in wood vary, the only true way is to state maximum heating capabilities in square feet. Here are some guidelines to follow: Base Calculations In Canada and Northern USA, start your calculations by using 75% of the stated maximum square footage. This is usually a safe place to start under most conditions. When you exceed this amount, be very careful in your calculations. Upgrade to the next size of furnace long before you reach the maximum heating capability. Ceiling Height Calculations are based on new construction with an 8 ft. ceiling. Basement & Upstairs VERY IMPORTANT Also add the square footage of the basement and the upstairs and any other area to be heated. Building Age The older the building the less likely it is to have adequate insulation and be airtight. New R2000 buildings have lower heat demands on the furnace. Distance From Furnace to Buildings The better the underground insulation then the less impact from long distances. Some of the better underground insulations loose almost no heat in 300 feet. Easy Rule of Thumb Solution Once you pass the 3/4 mark on square footage, consider moving up to the next size of outdoor furnace. Over sizing never hurts; it will allow more time between fills. You do not want to regret buying a small unit that is maximized. |
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