Legacy 11S1S1NA Built In Natural Gas Grill. Legacy 11S1 Features All 304 Stainless Steel. Gourmet Cast Stainless Steel Burners. Heavy-Duty Stainless Steel construction. Optional Infrared Burner. Largest cooking space compared to other same size grills. Most BTU's per square inch. Heats fast and stays hot!. 16-gauge stainless steel flavor grids are engineered for durability and even heat distribution. Extensive line of complementary accessories. 15 year warranty on backburners cast stainless steel burners, stainless steel housing and stainless steel cooking grids are warranted for as long as you own your grill. Legacy 11S1 Specifications Cooking Surface 368 sq. inches 23 x 16 . BTUs primary 42,000. Cut out 24.75 W x 17.75 D x 12 H. Material All 300 Series stainless steel.