Weber Summit Series is one of Weber’s few gas grill series. The Summit Series boasts both 4 and 6-burner grills so that there is a grill to fit every need. The 4-burner grills come in a colored version known as the Summit E series and the stainless steel series, known as the S series. The 4-burner models in the Summit series include the E-420, the E-450, the S-420, the S-450, the S-460, and the S-470.