2'x4' Leader Vermonter Evaporator w/Raised Flue Pan. Comes with a stainless natural draft arch and 9' of stainless stack. It is all one pan with 10 - 5.5" raised flues in the back and a two section flat area in the front. Comes with an internal bolt-on regulating system, and should boil off 20-25 gph. Requires 11 insulation boards, 9 full brick, and 82 half bricks.