DuoTube Heaters


DuoTube Heaters - Product Bulletin

The Casso-Solar Technologies’ Duo-Tube TM is available with a dual coat integral gold reflective coating or an integral white refractory that directs the infrared energy to the product without the need for external reflectors. Both the gold coating and the white refractory provide for maintenance free service. The gold is the most efficient reflective material for all infrared energy, as it will not oxidize like most other metallic reflectors and is recommended for applications for extended heater life with heater temperatures of up to 1400 deg F. The white refractory, slightly less efficient than the gold coating, will provide a wider emission spectrum and is suitable for extended life applications with heater temperatures of up to 1750 deg F. Heaters are maintenance free during their life span.

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Special Features

  • Horizontal or vertical operation
  • Custom wattage and voltages
  • Fast Response
  • Low inrush current
  • Design Flexibility
  • Easy to control


  • Dual Heavy Wall Quartz: 33 mm x 15 mm
  • Maximum Heated Length: 112" (2844 cm)
  • Heater Temperature: Gold coating on heater is limited to 1100 deg F
  • Peak Wavelength: 2.4-2.6 microns at 1750 deg F (920 deg C)


  • Maximum Coil Temperatures: 1400 deg F (760 deg C) on Gold heaters without cooling air and 1750 deg F (920 deg C) with cooling air 
  • Wavelength Range: 2.4- 6 microns, peak adjusted by emitter temperature
  • Mode of Operation: Horizontal to 112" (2844 cm) and Vertical to 24" (61 cm)