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Discussion Starter #1
Here's what you need to figure any lp tank operating time:

98,000 BTU's per gallon of propane.

LP weighs 4.24 pounds per gallon.

Therefore, a 5 pound cylinder will hold approximately 1.25 gallons of propane.

1.25 times 98,000 equals 122,500 btu's.

Divide 122,500 by the btu/hour rating of your heater, and that'll tell you how many hours the tank will last.
 
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