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Gas Fire Patio Heater A gas fire patio heater can warm an area for seating and provide a cozy ambiance to gather with friends. They can be powered either by propane, electricity or natural gas. Electric models offer the advantage of not emitting carbon monoxide. However, they aren't as portable as other alternatives. Propane tanks can be carried around, but require refilling in order to be refilled, whereas natural gas patio heating units connect directly to the gas line and eliminate the need for canisters. Safety Feature