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: 1 gallon of propane is about 90,000 BTU/hour. : A 20 lb tank holds a little more than 4 gallons. : My patio propane fireplace is 60,000 BTU. At full blast, a 20 lb tank will last about 6-7 hours, which is really close to the calculation.

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Q: How long will a 20 lb propane tank last in hours on an outdoor heater set at medium before I need to exchange the tank?
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