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How the Best Patio Heater Gas Can Help You Extend Your Outdoor Entertaining Season The best patio heaters can extend your outdoor entertaining season. These stylish, powerful heaters provide heat to areas as large as 215 feet and can be powered by propane or natural gas. Look for a model that produces at least 40,000 Btu or more, sufficient to comfortably warm a medium-sized patio. Also consider safety features like tilt switches and security straps for the propane tank. Cost to run A patio heater