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How the Best Patio Heater Gas Can Help You Extend Your Outdoor Entertaining Season The best patio heaters can extend the outdoor season. These elegant, powerful heaters can provide heat to areas as large as 215 feet and can be powered by either natural or propane. Think about a model that has 40,000 Btu and more. This will comfortably warm a medium-sized patio. Take into like tilt switches and security belt