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Gas Fire Patio Heater A gas fire patio heater can warm the seating area and create an inviting space for socializing. They can be powered either by electricity, propane, or natural gas. Electric models are more portable, however they emit no fumes or carbon monoxide. Propane tanks are portable, but require refilling and natural gas patio heaters connect directly to the home's gas line and eliminate the requirement for canisters. Safety Features Patio heaters can provide a pleasant heat for your outdoor space. However, they must be used with caution.