- Creative Assemblies, Inc.
- Electrical duct heater manufacturer that specializes in electrical heater design and fabrication.
- Exotherm
- Specializes in both standard and custom industrial heaters.
- Farnam Custom Products
- Designs a wide range of inline electric air heaters and surface heaters for application in both manufacturing processes and end products.
- Heater Designs, Inc.
- Designs and manufactures custom electrical resistance heaters, heating elements, and wire elements.
- Hotset Engineering Heat Performance
- Manufactures electric heating elements, hot runner temperature control systems including cartridge, coil and strip heaters, thermocouples, platinum RTDs, and nozzle heaters.
- Hotwatt
- Manufactures cartridge, air process, immersion, strip and finned strip, tubular and finned tubular, band, foil, flexible glasrope and ceramic heaters.
- I Squared R Element Company
- Manufacturer of silicon carbide heating elements, molybdenum disilicide heating elements and hot surface igniters.
- Mor Electric Heating Assoc., Inc.
- Manufactures ceramic, quartz, metal and panel electric infrared heaters.
- Tempco Electric Heater Corporation
- Manufacturer of electric heating elements, temperature controllers, temperature sensors and turnkey process heating systems.
- Thermal Circuits
- Manufacturing custom designed etched foil heaters, flexible OEM heaters, kapton polyimide heaters and silicone rubber heaters.
- Thermaltek
- Designs and manufactures high temperature furnace equipment and heating elements, used primarily for the production of technical ceramics, glass and non-ferrous metals.
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