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Natural Gas Patio Heaters Natural gas patio heaters use the same infrared heating element used by propane patio heaters to heat the air around them. There are some significant differences between these models. The output of heat is measured in British thermal units (BTUs). The higher the BTU rating is the greater the area that a heater will comfortably heat. Cost-Effectiveness In contrast to electric and propane patio heaters, natural gas models provide the most affordable solution for both homeowners and businesses. Sin