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Choosing an Electric Outdoor Heater For Patio Patio heaters use gas, propane or electricity to warm the air and add warmth to outdoor spaces. Electric models heat the air using an emitter, whereas natural gas and propane heaters make use of fire. Most homeowners prefer propane patio heaters since they do not require installation and are able to be operated with a 20lb tank of propane. However, top-rated electric models like AEI's Infratech can also keep outdoor spaces cozy and invitin