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Gas Fire Patio Heater A gas patio heater can be used to warm up a seating area, and create a warm space for gathering. They can be powered by propane, natural gas 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, while natural gas patio heating units connect directly to the gas line and eliminate the need for canisters. Safety Features Patio