Established in 1959, St. Louis-based Heatrex designs and manufactures engineered electric heating and thermal-management equipment for commercial, industrial, OEM, and rail applications. Its work ranges from custom heating systems to components such as tubular elements and immersion heaters, with concept development, prototype testing, and production handled across two Missouri manufacturing facilities. Heatrex is part of ASPEQ Heating Group and serves customers in North America and abroad.
ISO 9001:2015
Watlow Electric Manufacturing CompanyWatlow Electric Manufacturing Company is a St. Louis-founded industrial manufacturer that designs and makes complete thermal systems, including electric heaters, temperature sensors and control equipment. Founded by Louis Desloge Sr. in 1922 to produce heating elements for the shoe industry, Watlow now employs more than 4,200 people across 12 manufacturing facilities and five technology and development centers. The company holds more than 1,100 patents and brings a century of thermal engineering experience to demanding industrial applications worldwide.LOUIS, MO
Spectrum, IncEstablished in 1965, St. Louis-based Spectrum, Inc. makes electric heating systems that keep railroad track switches operating through ice and snow. Its specialty is practical rail equipment, including flat rail heaters and crib heaters, supported by control systems built with commercial-off-the-shelf components for simpler maintenance. Spectrum also manufactures modular industrial heaters, including electric infrared die heaters, extending its work beyond the railroad.BROOKLYN HEIGHTS, OH
EZ Heat CorporationFamily-owned and proudly made in the USA since 1987, EZ Heat Corporation manufactures custom industrial heating elements from its Marble Falls, Texas operation. Founded in Dallas as Star Heating Manufacturing, the company relocated in 1990 and adopted the EZ Heat name in 1992, becoming known for to-spec manufacturing and same-day shipping on custom products.CHAGRIN FALLS, OH
ChromaloxFounded in the United States in 1917 by Pittsburgh engineer Edwin L. Wiegand, Chromalox designs and manufactures electric thermal technologies and industrial heating systems. Its long history runs from the strip heater that helped become the modern electric clothes iron to heaters used in nuclear plants, NASA launch systems, and the Apollo 11 lunar module. Now part of Spirax Group, Chromalox develops thermal solutions for demanding industrial applications while supporting the shift toward lower-carbon operations.PITTSBURGH, PA