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Business History
Unitherm Furnace, LLC, headquartered in Wentzville, Mo., is a manufacturer of custom thermal processing equipment, namely industrial furnaces and ovens. With more than 65 years of industry experience, Unitherm creates unique designs using standard components to ensure ease of maintenance over the life of the equipment. Unitherm has specialized in solving problems since 1980. The industrial-furnace company was the brainchild of Frank Lim, who already had two decades of experience in the furnace industry when he started considering the possibility of launching his own business. The country was in the midst of a recession, and Lim saw a market opportunity for rebuilt furnaces. Frank approached colleague Ron Kientzy, who also had extensive experience in furnace manufacturing along with instrumentation and controls — about launching a company together. Despite the economic difficulties at the time, the company they built together thrived.
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Regular Hours
Mon - Fri:
Sat - SunClosed
New Custom Designs, Repairs, Rebuilds, Modifications and Renovations for Industrial Furnaces, Thermal Processing Equipment, Custom Control Panels, Burner and Combustion Systems, Flame Safety Equipment , Thermocouples, Wire, Spare Parts, Accredited Calibrations, Technical Support, Valve Train Inspections, Safety Inspections, & Training.
Payment method
visa, discover, mastercard, all major credit cards, check, debit, amex, financing available
Serving the United States, Canada & Mexico
English, Spanish

ISO/IEC 17025:2005 Accredited

ISO 9001:2015 Registered

NAM(National Association of Manufactures), Missouri Chamber of Commerce, NFPA(National Fire Protection Agency)
Industrial Furnaces, Industrial Equipment & Supplies, Industrial Equipment Repair, Machine Shops, Machinery-Rebuild & Repair


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