Combustion Research Corporation - Reflect-O-Ray and Omega II infrared "tube type" heating equipment. 40K to 360K BTU/hr, Vacuum and Power vented. Aluminized Steel (standard) Stainless availible. 10 year tube warranty.
Fostoria Industries, Inc. - manufactures infrared heating systems and ovens as well as industrial task lighting.
GoGaS Goch Gmbh & Co. - manufactures space heating systems like plaque heater, tube heater, warm air heater (all powered with gas). Heating systems for churches, grandstands, store houses and so on.