The Weber Summit S-440 is a gas grill constructed from a stainless steel cart with a stainless steel bottom shelf and a stainless steel shroud. An upgrade from the Summit S-420, the Summit S-440 features 4 stainless steel burners that burn at 48,800 (versus 42,000) BTU per hour, a smoker burner and stainless steel smoker box that burns at 8,000 BTU per hour, and a infrared read-mounted rotisserie burner that burns at 10,600 BTU per hour.