Firemagic has used various burners in their grills throughout the years. Early Grills used Cast Iron Burners that are no longer available OEM (only aftermarket are available). These Straight Cast Iron Burners only come in Cast Stainless OEM, but are very expensive. So choosing the cast iron is a much better choice. Their Choice Grills use a center fed U shaped burner and the Aurora and Echelon use a really heavy Cast Stainless "E" Burners.