Used 200 PSI Mohawk 3-Pass Dryback Firetube boiler. Manufactured by Superior Boiler. Model 4-5-508. 508 Sq Ft heating surface. Output 3348 MBH. 3450 lb/hr (steam). Natural Gas fired. 182"L x 73"W x 85"H. 11200 lbs. Serial #12598. National Board #12598. Built 1995. Includes 100 gallon Deaerator with 3HP pump.