Our Preferred Special Combustion Engineering Division in Tulsa, OK offers state-of-the-art burners for your field-erected, package boilers, heaters, and thermal oxidizer applications. From coal to gas conversions to waste gas or specialty gas, Preferred’s combustion engineers have the right burner for your new or retrofit applications.

There are multiple burner lines available:
  • Preferred X-Plus (Gun Style and Register Style)
  • Preferred Utility Burner
  • Preferred NanoNOx Burner (Ultra Low NOx)
  • Preferred API-RF and AP-AF Burners

5 MMBtu/Hr through 400 MMBtu/Hr

Ultra Low NOx, Low NOx without FGR, and Low NOx with minimal FGR are available.

Ultra High Efficiency:
1.5% - 2% Excess Oxygen Levels Available

  • Single Burner
  • Watertube
  • Auxilary Burners
  • Firetube
  • Multiburner
  • Thermal Oxidizers
  • Tangential
  • Air Heaters
  • Utility Boilers
  • Coal > Gas Conversion

Fuel Type
  • Natural Gas
  • Process / Waste Gas
  • Light/Heavy fuel oil
  • Biogas / Landfill Gas
  • Propane
  • Solid Fuel
  • Hydrogen

Preferred offers the complete combustion system solution through single-source responsibility and value-added offerings including:

Fuel Piping Trains
Offered in ANSI B31.1, Class 1 Div 2, NEMA 4, Stainless Steel, and Carbon Steel Construction. Standalone Fuel Blending skids are engineered for your Boiler or Gas Fired Generator to offset primary fuel consumption.

Burner Management and Combustion Control Systems
Engineered to your specifications in PLC, Microprocessor, Multiloop, or Combination Platforms. Control systems available in Class 1 Div 2 and Safety Integrated level designs.

Combustion Consultation
Physical Flow Modeling and Computation Fluid Dynamics (CFD) can help optimize proper air flow distribution with your proposed application. It is also offered as a service for existing field applications, including:

  • Site and Energy Surveys
  • NFPA 85 Audits
  • Turnkey Installation
  • Installation Supervision Services
  • Startup and Commissioning Services
  • Aftermarket Support

  • Packaged Burner
    Natural gas and No 2 oil hot water boilers with a high-temperature hot water system, equipped with an integrated BMTS panel.
  • Gas Blending Skid
    The Gas Blending Skid operates by dosing natural gas with biogas, a process designed to maintain close proximity to natural gas levels.
  • Burner Retrofit
    The retrofit approach focuses on efficiency, where a new burner seamlessly integrated without disrupting the existing setup.
  • Standalone Fuel Gas Skids
    This design ensures a streamlined and integrated solution, catering to the specific fuel management needs of various applications.
  • Optimized Combustion Processes
    Insert burners are strategically placed within the common windbox, enhancing efficiency and heat distribution.
  • Waste to Energy
    A concerted approach toward sustainable energy solutions by harnessing the potential of waste materials.
  • Thermal Fluid Heaters
    These systems utilize specialized thermal fluids, eliminating the need for intricate water treatment processes.


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