Introducing Our Round Burners A 18″ Stainless Steel Fire Pit Ring uniquely designed with staggered ports for a better flame pattern and to help keep water from accumulating in the burner ring. 2 Concentric Rings 18″ Diameter with 1/2″ hub All Stainless Steel For optimal flame height, we recommend at least 90,000 BTU Available for natural gas or LP Liquid propane. (For LP Liquid Propane you must add air mixing orifice to reduce sooting).