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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 warm outdoor spaces. While propane and natural gas models utilize fire to heat the air, electric models use an emitter that transforms into infrared energy to heat people and furnishings. The majority of homeowners opt for propane patio heaters because they do not require installation and are able to be operated with a 20lb tank of propane. Electric models,