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1 gal of propane contains 91330 BTU. My RV furnace is a 40,000 BTU unit, so that means that after 2h15 of continuous run time, I will have used a gallon. A 30 lb propane tank contains 7 gallons of propane, so should give you 15h45 minutes of continuous operation. Thankfully, depending on outside temp, the burner will cycle on and off. But the point is that the numbers quoted above are in the right ballpark.
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