Sigma Thermal

Sigma Thermal

4875 Deen Rd, Marietta, Georgia, 30066

AboutSigma Thermal

Who We Are

Sigma Thermal designs, engineers, supplies, and services process heating systems for multiple industries. Our products include thermal oil and thermal fluid heating systems, indirect process bath heaters, electric process heaters, biomass-fired energy systems, direct fired process heaters, system automation, parts, retrofits/upgrades, and support services.

Our staff is comprised of dedicated and experienced industry veterans who will learn about your application to provide solutions specific to your project needs. Whether you need a standard packaged heater, a highly engineered process heating system, a tune-up of your current system, or servicing for another brand of heater, our Engineers and Technicians have the knowledge and experience to make your project a success.

Sigma Thermal is founded on the belief that exceptionally deep engineering knowledge, applied practical field experience, and real customer service are the keys to successful system design and project ex. These principles form the underlying framework for our company, and they are tightly held by all Sigma Thermal employees today.


At Sigma Thermal our commitment to providing exceptional customer service is what sets us apart from the competition. Guided by a straight set of principles, the Sigma Thermal team works continuously towards ensuring an effortless experience for all clients.


Operating as Sigma Manufactu, we’re also capable of assembling a wide variety of fabricated equipment and skid packages. Operating from an ASME U, S, and R–certified and AWS D1.1–compliant facility, we specialize in all the manner of process equipment fabrication, from routine to complex, under one roof.

Our 40,000-square-foot facility includes a 36’ under hook, 50 tons of lifting capacity in bay #1, and 60 tons of lifting capacity in bay #2, giving us the resources to build all the manner of process heating components. Some of our products include:

  • Piping assemblies
  • Skid packages
  • Fired process heaters
  • Convection coils
  • Radiant coils
  • Associated equipment housings
  • Total equipment assembly

Whether you need individual replacement components or a whole new system designed from scratch, our state-of-the-art equipment can churn out quality products in record time.