Engineered and
Built to Order

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Capacity: 10,000 - 300,000 lb/hr

Fuel Capabilities: Digestor Gas, Fuel Oil, Hydrogen, Natural Gas, Other Fuels

Steam Design Pressure: Up to 1,200 psig


General Description

The O-Type industrial watertube boiler has a symmetrical furnace with a vertical flue gas exit which allows for a narrow footprint and a balanced center of gravity.


  • Large furnace promotes low emissions
  • Engineered for long term reliability
  • Factory built, field erect and modular designs available
  • Radiant super heater design available
  • Robust long lasting design, +30 years lifespan
  • Windbox mounted fan up to 100KPPH
  • Superheated steam temperature up to 900 °F
  • Gas outlet configuration: top
  • Available as a Modular Boiler System
  • Offered in the patented DFW design


  • Symmetrical furnace with a vertical flue gas exit which allows for a narrow footprint and a balanced center of gravity.
  • More versatile than a D-Type boiler
  • Typically fitted with a combustion chamber on the front end that allows the thermal energy created by solid fuel firing or a waste stream from another source to be used in conjunction with the “O” symmetrical furnace, vertical gas outlet and overall narrow width
  • Available as a Modular Boiler System


100% Furnace water-cooled membrane wall construction
Air-tight full membraned front, rear, and side exterior walls
0.25″ thick membrane fin plate
All drilled drum holes are grooved
Minimum tube thickness exceeds ASME requirements:
– 0.105″ min. wall convection tubes
– 0.120″ min. wall furnace tubes
Economizer designed and built by Superior
All ladders and platforms are fit and bolted to boiler then disassembled for shipment


Packaged boilers are trimmed with necessary safeties and code piping and signed off on by code inspectors. Factory mounted and wired, proven and reliable packaged burners are available from your choice of burner manufacturer.

Our Problem Solvers Explain

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