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How to Choose an Electric Patio Heater Electric patio heaters can be efficient in heating outdoor areas. The output is measured in BTUs. You can determine the amount of heat you need by measuring the square footage. Some outdoor electric heaters can be installed on ceilings and walls in a way that doesn't disturb the setting. They're also more secure than freestanding models. Eco-friendly When used responsibly they can be green alternatives to traditional propane, wood or oil-powered heaters.