The actual calculation is quite complex, taking many properties of the furnace into account. Older furnaces have ratings of 60 afue or even lower; the newest high-efficiency furnaces are rated in the 90-95 afue range.
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This definition makes the air watt equal to 0.9983 watt. Ale gallon a traditional unit of liquid volume in Britain and the U.S., the ale gallon was equal to 282 cubic inches (4.6212 liters) or about 1.2208 quid gallon (1.0165 British Imperial gallon).

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