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How to Choose the Best Electric Patio Heater When choosing an outdoor heater, take into consideration the size of your patio and whether you prefer freestanding models or ones that are mounted to the wall. Also, consider safety features such as thermocouples that are anti-tilt and have an anti-tilt feature. The heat output of a patio heater is measured in British thermal units. This determines how large an area it is able to comfortably warm. Higher Btu ratings are necessary for larger areas and