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http://www.exothink.com/Pages/btu.html Working with my propane supplier ( I am a portable tank schlepper ) has made me more aware of fuel consumption rates for forges and crucible furnaces. I typically get 3 crucible runs from a 10 Gallon tank. say 3 gallons per run of about 1.5 hrs or 2 gallons per hour. ( 360 inches cubed = volume) 180,000 BTu/hr My forge is the same furnace probably running a little slower, say at 1.5 gallons per hour.....I can run the forge at a much lower rate but the 1.5 is typical.( 360 inches cubed = volume). 135,000 BTu/hr NOw I am sizing a forge to hea