First Cook with Gas in Vision Kamado Posted September 8, 2016 One quick addition to my previous post about cooking Pizza with the gas insert Vision Hybrid grill. The gas insert comes with a stainless steel "heat exchanger" that installs directly over the gas burner that serves to distribute the heat more evenly in the cooking cavity. This heat exchanger is round in shape, and about 8 inches tall with multiple holes all around the sides and probably acts as a heat diffuser. I am not sure about this but the heat appeared to be distributed evenly throughout the cooking cavity and lava stone. I appreciate all the input and am still learning. So far, I am definitely a fan of Kamado cooking.