Heat 5-Burner Insulated Jacket HTX-INSJACK-5B. HTX-INSJACK-5B. The HEAT HTX-INSJACK-5B Insulated Jacket for 5-Burner Gas Grills is a safety essential when installing your HEAT 5-burner gas grill into a combustible enclosure such as an outdoor kitchen or BBQ island. This insulated jacket is constructed of stainless steel with a self-supporting ledge around the sides and back that adds one more layer of quality to your outdoor kitchen. Pristine stainless steel constructions ensures that this jacket will remain vibrant and strong in outdoor weather conditions.