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Choosing an Electric Outdoor Heater For Patio Patio heaters use propane, gas or electricity to heat the air and provide warmth to outdoor spaces. While propane and natural gas models make use of fire to heat the air, electric ones utilize an emitter which converts into infrared energy that is used to heat people and furnishings. The majority of homeowners choose propane patio heaters because they do not require installation and operate with a propane tank that weighs 20 pounds. However, top-rated electric models like AEI's Infratech can also keep outdoor spaces c