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Natural Gas Patio Heaters Similar to propane patio heaters natural gas models utilize an infrared heating element to heat the air in their immediate vicinity. However, there are some important differences to consider when selecting and using these models. British thermal units (BTUs) are used to measure the amount of heat produced. The higher the BTU rating, the more space a heater will comfortably cover. -Effectiveness In contrast to propane and electric patio heaters natural gas models offer th