Aftermarket Services



OEM Replacement Parts
An extensive inventory of parts from a variety of manufacturers are available for quick order, shipping and delivery. Sigma parts specialists can assist with part selection and locating hard-to-source parts for your heating system.

Inventory is updated continually to account for discontinued or modified components.



Maintenance & Service Plans
On-site technical service and help to troubleshoot complex operating issues.  We assist with upgrades and replacements of control panels and can aid with Boiler MACT compliance.

Prescheduled, preventative maintenance plans are also offered to ensure maximum system operation.

System Analysis / Energy Audits
A complete system analysis to help reduce wasted energy and bring your system into compliance with industry standards.




Upgrades / Replacements
Retrofits services available to help optimize your heater or system performance. We can retrofit heating systems to repair damages and modernize equipment.


Resources Center

Our Blog

Understanding Thermal Fluids & Thermal Fluid Systems

Thermal Fluid Management • Advantages of Thermal Oil Heating Systems Types of Thermal Fluid Heaters • Work With Sigma Thermal The demand for process...


Teamwork Can Make or Break Your Project

Industrial capital equipment projects can be complicated and expensive undertakings. Often many suppliers are working together with consultants and contractors to deliver a successful...