Solaronics, Inc. 's (Rochester, MI) Suntube Stainless Series of gas infrared tube heaters are designed to withstand high humidity and corrosive environments. The heaters have a reflectional efficiency of 91.7% and the reflectors rotate from 0 to 45 degrees. Radiant tube lengths can extend to 70 ft, with inputs from 40,000 to 200,000 Btuh.