Sigma Thermal offers a variety of industrial retrofit and upgrade services.

Retrofitting existing process heating equipment can be challenging and frustrating if not planned and executed properly.

Sigma Thermal can assist with assessing your needs, making recommendations, and implementing solutions to improve the operation or extend the life of your equipment. Whether you need to repair a damaged system, upgrade to more modern equipment, or retrofit an existing heater to modify its capabilities, we have the knowledge and resources to ensure your success.

Submit an RFQ – Let our application engineers help you assess your retrofit needs.


Common Retrofit Services

Engineering / Site Audits

Process Improvements

  • Increase Capacity
  • Capacity Reduction

Efficiency Upgrades

  • Economizers
  • Combustion Air Pre-heaters

Thermal Fluid Heating Systems

  • Custom Solutions
  • Temperature Control Loops
  • Slip Stream Filtering Systems
  • Pump Skid Assemblies


  • Heater Lid
  • Heater Coil
  • Burner Tube

Heater System Modifications

  • Alternative Fuels
  • Heater Lid
  • Biomass Hydraulic System

Auxiliary Equipment

  • Fan
  • Burner & Fuel Train Packages
  • Expansion Tanks
  • Fill & Drain Tanks
  • Skidded Equipment
  • Piping Assemblies
  • Biomass Conveying Equipment