Reznor's UDBS gas-fired, separated combustion unit heaters are available in 14 sizes ranging from 30,000 to 400,000 BTUH gas input. Model UDBS heaters are designed for 82-83% thermal efficiency and are approved for commercial/industrial installations in the United States and Canada by the Canadian Standards Association (CSA).

Note: UDBS separated combustion units require installation of a specially designed combustion air/vent system including the unique concentric adapter box that allows for only one building penetration for both the vent and combustion air.

UDBS Product Literature


Key features of the UDBS

  • 82-83% Thermal efficient
  • 45-75°F Rise range - Sizes 30-350
  • 50-80°F Rise range - Size 400
  • TCORE2® titanium stabilized aluminized steel heat exchanger
  • Patented single burner combustion system


The UDBS can be used in many markets including:

  • Retail
  • Showrooms
  • Workshops
  • Schools
  • Exhibition Halls
  • Sports Facilities
  • Water Treatment
  • Transportation Terminals
  • Agricultural-Horticulture
  • Industrial Manufacturing
  • Warehouse/Distribution
  • Food & Beverage
  • Pharmaceutical & Biotech

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