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for Restaurants and Bars Gas patio heaters make restaurant seating areas more inviting on colder evenings. These freestanding units are powered by a bottled propane tank that is mounted on castors to allow for easy movement. The initial cost of natural gas patio heaters is more expensive, but they have lower operating costs over the long term. They are ceiling or wall mounted and are usually unnoticed since they are situated over guests' view. Calcana High Output Gas Patio Heater