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Gas Fire Patio Heater A gas fire heater for the patio can warm the seating area and create an inviting space for gathering. They can be powered by natural gas, propane or electricity. Electric models have the advantage of no fumes or carbon monoxide, however they are less portable than other options. Propane tanks are portable but need to be refilled in order to be refilled, whereas natural gas patio heaters connect directly to the gas line and eliminate the need for canisters. Safety Features Patio heaters offer a warm warmth to enjoy outdoor space