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Gas Fire Patio Heater A gas patio heater can be used to heat up a seating area, and create a warm space for gathering. They can be powered with propane, electricity or natural gas. Electric models offer the advantage of a lack of fumes or carbon monoxide, however they are less portable than other options. Propane tanks are portable, but require refilling, while natural gas patio heaters connect directly to the gas line and eliminate the need for canisters. Safety Features Patio heaters offer