High Efficiency, Gas Heating, Separated Combustion, 11 sizes, 75 MBH - 400 MBH

Reznor's SDH is the new separated-combustion addition to the line of Pre-Engineered Ventilation Air Handlers (PREEVA). Available in 11 sizes (75MBH to 400MBH), each size is designed for a minimum of 81% thermal efficiency and is available for use with either natural gas or propane.

Model SDH separated-combustion heaters are approved for commercial/industrial installations in the United States and Canada by ETL Testing Agency. All published airflow data and sound data are supported by AMCA tested and rated airflow performance curves.

SDH Product Literature


Key features of the SDH

  • Patented TCORE2® combustion system - includes titanium stabilized aluminized steel heat exchanger
  • ETL certification
  • Minimum 81% thermal efficiency throughout modulated range
  • Proven separated-combustion technology including shipped-separate vent/combustion air kit (vertical or horizontal)
  • Maximum 70°F temperature rise (optional 120°F)


The SDH can be used in many markets including:

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

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