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.