Main pan is 36 x 24 x 7, capacity is 25 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 may be used as a finishing pan. the top has a 3/4 in. hemmed lip to the inside. this gives the pan strength and a good way to lift the pan.