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Choosing the Best Electric Patio Heater The output of heat from the patio heater is typically measured in British thermal units (Btu). Bigger spaces and colder climates need more Btu. Electric patio heaters are also less to operate than heaters powered by natural or propane gas. You should still look out for safety features like auto shut-offs and a stable foundation to avoid fire hazards. of heat is one of the most important factors to take into consideration when selecting the right patio he