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Gas Patio Heaters for Restaurants and Bars Gas patio heaters make restaurant seating areas more inviting on colder evenings. These freestanding units are powered by a bottle of propane tank, which is positioned on castors that allow for easy mobility. The initial cost of natural gas patio heaters can be higher however, they have lower operating costs over the long term. They are wall or ceiling mounted and typically go unnoticed since they are situated in the middle of guests' line