How Long Will A 20 lb Propane Tank Last?

A 20-pound propane tank will last for about 18-20 hours if used at a moderate rate. It assumes you are using it for activities such as grilling or heating and not running it at full power for an extended period. If you use your propane tank at a higher rate, it will run out faster. For example, if you are using it to run a space heater, it will only last for about 6 hours.

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