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Choosing an Electric Outdoor Heater For Patio Patio heaters use propane, gas or electricity to heat the air and add warmth to outdoor spaces. While propane and natural gas models make use of fire to heat the air, electric models make use of an emitter that converts into infrared energy that is used to warm furniture and people. Most homeowners prefer propane patio heaters since they don't require installation and work using an 20lb propane tank. Electric models, such as the AEI Infratech, can a