All Summit® Platinum 4-burner gas grills feature:
The Summit® Platinum B4 comes with all of the same great features as the A4, plus a 12,000 BTU-per-hour input side burner.
The Summit® Platinum D4 comes with all the great features of the B4, plus a spit fork rotisserie, a 9,600 BTU rear-mounted infrared rotisserie burner; and a stainless steel smoker box with a dedicated 8,000 BTU stainless steel smoker burner.