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Cheap Patio Gas Heaters Patio heaters are available in a wide range of designs and sizes. Some are electric heaters that are hardwired and require professional installation, while others utilize natural gas or propane to heat your area. The neat, mobile gas cylinders are available in sizes ranging from 5kg green patio bottles up to 13kg propane cylinders. They are compatible with traditional BBQs as well as portable heaters and Ooni Pizza Oven