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Choosing an Electric Outdoor Heater For Patio Patio heaters can be powered by gas, electricity or propane to heat the air and warm outdoor spaces. Electric models heat the air with an emitter, while natural gas and propane heaters use fire. Most homeowners opt for propane patio heaters since they do not require installation and work with the help of a 20lb propane tank. However top-rated electric models such as AEI's Infratech can also keep outdoor spaces warm and inviting. Cost When weighing their options, home and business owners have three options