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Natural Gas Patio Heaters Like propane patio heaters, natural gas models also use an infrared heating element to heat the air in their immediate vicinity. There are some important distinctions between these models. Heat output is listed in British thermal units (BTUs). The higher the BTU rating is, the larger the area that a heater is able to comfortably heat. Cost-Effectiveness Natural gas patio heaters are the most economical choice for homeowners as well as businesses. Because they are connected to you