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Choosing an Electric Outdoor Heater For Patio Patio heaters make use of propane, gas or electricity to heat the air and provide warmth to outdoor spaces. While natural gas and propane models utilize fire to heat the air, electric ones utilize an emitter which converts into infrared energy that is used to heat people and furnishings. Most homeowners prefer propane patio heaters because they do not require installation and work with a propane tank that weighs 20 pounds. Electric mod