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Choosing an Electric Outdoor Heater For Patio Patio heaters can be powered by electricity, gas or propane to heat the air and provide warmth to outdoor spaces. Electric models heat air by using an emitter, while propane and natural gas heaters use fire. Most homeowners prefer propane patio heaters, as they do not require installation and can be operated using a 20lb tank of propane. However, top-rated electric models like AEI's Infratech can also keep outdoor spaces warm and inviting. Cost Busines