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A 20 pound propane tank holds 4.1 gallons of LP which equates to about 0.016 cubic meters. If your heater burns 3 m3 per hour the tank will last about 19 seconds. If you meant .0003 then it will last 51.73 hours.

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Q: If a gas water heater burns 0003 m3 per hour how long will a 20 pound propane tank last?
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