1991 Cleaver Brooks 700 / 800 HP Steam Boiler 150 PSI Natural gas/ Diesel CB-200-700. Manufacturer: Cleaver-Brooks. The boiler is a 700 HP 150 PSI with perfect tubes. Ready to go to work. 150 PSI, 29,291,000 BTU/HR., 700 HP, The year 1991, Natural gas / Diesel, CB spray Master Deaerator, Culligan water softener system.