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Choosing the Best Electric Patio Heater The energy output of patio heaters is typically described in British Thermal Units (Btu). Btu is the standard for larger spaces and colder climates. Electric patio heaters are also less to operate than those that are powered by propane or natural gas. But you should still look for safety features like auto shut-off and a sturdy base to stop fire hazards. Efficient The output of heat is one of the most important factors to take into consideration when selecti
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