Our Products

Thermal fluid heating is a type of indirect heating in which a liquid phase heat transfer medium is heated and circulated to one or more heat energy users within a closed loop system. Thermal oil, glycol, and water are common heat transfer mediums. The Sigma Thermal HC product line offers two types of standard thermal fluid heating system packages, the HC-1 and HC-2. Additionally, circulation heaters are offered for electric process thermal fluid systems. We offer engineered thermal fluid heaters for customized needs too.

Sigma Thermal offers standard thermal fluid heaters, custom engineered thermal fluid heaters, complete thermal fluid systems and a full range of parts and support for your process.

For help selecting the right solution for your project, submit an RFQ to our application engineers today.

An electric process circulation heater is used to flow a fluid directly over the heating elements. Heaters may be installed horizontal, vertical or even sloped for vaporizing liquids. These heaters can heat a variety of fluids from high temperature gas to hard to heat liquids. Each circulation heater is carefully selected for each specific process.

Get in touch with a Sigma Thermal representative to request a quote on an immersion heater.

An electric process heater offers the benefits of directly heating gases and liquids with electric tubular elements. Since the heat is generated by electricity, virtually all of the energy is consumed by the product being heated. As a result, the electric immersion is near 100% efficient. With standard elements constructed of Alloy 800, these heaters are designed to heat a variety of fluids and maintain corrosion resistance.

Get in touch with a Sigma Thermal representative to request a quote on an immersion heater.

The NUK produces non-toxic process heat while offering the same advantages of a conventional hot oil system.

The NUK High-Pressure Steam Generator is a closed looped (hermetically sealed) system that produces steam for high-temperature applications.

Oil Deodorization

Sigma Thermal developed the NUK specifically for the application of oil deodorization, typically used within the food industry. During deodorization, the NUK is used as a heat source in the process to safely remove undesirable flavors and odors from edible oils; leaving the oil free from toxins.

Sigma Thermal is a leader in providing modern Biomass-fired energy systems and related equipment for industrial clients worldwide. We provide complete packaged systems which include: Design, Engineering, Manufacturing, Automation, Installation supervision, Parts, and Equipment service, backed by decades of energy experience.

With the high cost and environmental impact of fossil fuels, heat energy is a precious commodity that cannot be wasted.


Any exhaust gas stream with temperatures above 250F has the potential for significant waste heat recovery. Consumers of waste heat energy can be found in almost any facility and are easy to locate.

Typical examples include plant process heating, combustion air pre-heating, boiler feedwater pre-heating, and building heat. In addition to savings in everyday fuel consumption, many facilities can market and sell carbon credits back to industry. State and or federal funding is often available for waste heat recovery projects helping to reduce capital costs and expedite system payback.

Sigma Thermal has a full service Automaton Group that specializes in process and safety control systems. Our experienced engineers, designers, programmers and fabricators work together to execute all project specifications and requirements. Sigma Thermal Automation offers comprehensive and cost effective solutions to complex industrial challenges. Our Automation solutions include:

Electrical & Functional Safety Engineering Design
Burner Management Combustion Control Systems
Upgrades and Modifications
Field Support-Programming and Training
Basic Process Control Systems (BPCS)
Safety Instrumented Systems

At Sigma Thermal, our application engineers have a solid background in the design and construction of robust and reliable direct fired process heaters for ammonia heating applications.

At atmospheric pressure, anhydrous ammonia (NH3) is a gas with a boiling point of -34F. For agricultural use, it is stored as a liquid in large pressurized tanks. During planting season, NH3 is fed from storage tanks through delivery trucks in loading stations typically adjacent to the storage tanks. Prior to loading into the distribution tankers the NH3 must be heated from approximately -30F to approximately 40F. One of the critical considerations of this process is the short window allowed for crop application; heating systems must be robust and flawlessly dependable.

We manufacture all types of heaters to manage NH3 in its liquid and vaporized during production andor distribution. This specialized equipment is built to handle various application capacities while ensuring safe operation around potentially harmful and damaging vapors.