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How to Choose the Best Electric Patio Heater Consider the size of the patio and whether you'd like a heater that is free-standing or one that can be mounted to the wall. Also, think about security features such as anti-tilt devices and thermocouples. The heat output of the patio heater is measured using British thermal units. This determines the size of an area that it can comfortably heat. Higher Btu ratings are essential for larger spaces and colder climates. Cost A patio heater can improve your outdoo