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How Much Does an Electric Patio Heater Cost to Run? Electric patio heaters are cheaper than gas models, and they use a fraction of electricity. The cost of running them will vary according to the power they use and what setting they are set to. You can control them through your home automation system. They don't emit carbon monoxide, so they are ideal for areas that are windy. Flexibility Electric patio heaters are more flexible than gas patio heate