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Choosing of a patio heater is usually measured in British thermal units (Btu). Larger spaces and colder climates will require more Btu. Electric patio heaters are also less to operate than heaters that are powered by propane or natural gas. But, you must still look for safety features such as auto shut-off as well as a solid base to prevent fire hazards. Efficient Heat output is one of the most important aspects to take into consideration when selecting the best patio heater.