1. Zone 1 is the outer ring and can operate independently. Zone 1 produces up to 15,000 BTUs/hr and can be used for indirect cooking like ribs, roasts, large cuts of meat and hot dogs.
2. Zone 2 is when both burner zones are engaged and the grill is producing up to 21,000 BTUs/hr. This works well for direct cooking like steaks, burgers, pizza, poultry and seafood.