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Natural Gas Patio Heaters Natural gas patio heaters use the same infrared heating element as propane patio heaters to heat the air around them. However, there are some important differences to keep in mind when deciding on and using these models. British thermal units (BTUs) are used to measure the heat output. The higher the BTU rating the greater the area that a heater will comfortably heat. Cost-Effectiveness Natural gas patio heaters are the most economical op
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