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Choosing an Electric Outdoor Heater For Patio Patio heaters utilize gas, propane or electricity to heat the air and provide warmth to outdoor spaces. Electric models heat the air using an emitter, while natural gas and propane heaters use fire. Most homeowners prefer propane patio heaters because they don't require installation and can be operated with a 20lb tank of propane. However top-rated electric models such as AEI's Infratech can also keep outdoor spaces cozy and inviting. Co