https://cleveland-marshall.mdw....rite.net/why-adding-
Gas Patio Heaters for Restaurants and Bars Gas patio heaters make restaurant seating areas more inviting on colder evenings. These free-standing heaters are powered by a bottle of propane tank housed on castors for easy movement. Natural gas patio heaters are more expensive at first however they are less costly to operate over time. They are installed on the wall or ceiling and are generally not seen because they are not in guests' eyesight. Calcana High Output Gas Patio Heat