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How the Best Patio Heater Gas Can Help You Extend Your Outdoor Entertaining Season The best patio heaters will extend your outdoor entertaining season. These elegant, powerful heaters can are capable of heating up to 215 square feet and can be powered by either propane or natural gas. Look for a model that produces 40 000 Btu or more, enough to comfortably warm a medium-sized patio. Consider safety features such as tilt switches and security belts for the tank. to run A patio heater uses plenty of fuel