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How to Make Your Propane Patio Gas Less of an Eyesore Propane patio heating systems are a fantastic option for outdoor heating. They are easy to use and do not require a gas line as gas heaters do. This fuel, also referred to as Calor Patio Gas, is stored in green cylinders. It is ideal for BBQs and outdoor heating appliances. It is compatible with 27mm clip-on regulators. Safety Propane is a very flammable liquid that could pose a safety threat in the event that it is not properly stored and utilized.