Main pan is 48 x 24 x 7, capacity is 34 gallons. Preheater pan is 24 x 12 x 6, capacity is 7 gallons. Both pans have a 1/2 in. NPT drain. Preheater lifts off main pan and also maybe used as a finishing pan. The top has a 3/4 inch hemmed lip to the inside. This gives the pan strength and a good way to lift the pan.