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How the Best Patio Heater Gas Can Help You Extend Your Outdoor Entertaining Season The most efficient gas patio heater will help extend the duration of your outdoor entertainment. These elegant, powerful heaters can provide heat to up to 215 feet2 of space and are powered by either natural gas or propane. Look for a model that produces 40,000 Btu or more, sufficient to adequately warm a medium-sized patio. Take into consideration safety features like tilt switches and security belts for the tank. Cost