The eF Series® utilizes exclusive designs and technologies for unsurpassed efficiency, installation flexibility and quiet operation. With thermal efficiencies as high as 99.1%, these units are the most efficient of their kind in the industry and now with several models qualifying for ENERGY STAR®. Last but not least, the eF Series® is extremely quiet, a feature building owners, managers and occupants will appreciate.

Product Highlights
Energy Star
Commercial Hydrojet<sup>®</sup>
Brass Drain Valve


  • Up to 99.1% Thermal Efficiency
  • ENERGY STAR® Qualified on several models
  • ICON HD™ Commercial Control System
  • OnGuard RMT™ System Compatible– Accessory Module Required
  • Direct Spark Ignition
  • Three Pass Flue System
  • Pre-Mix Power Burner
  • Submerged Combustion Chamber
  • Hydrojet® Sediment Reduction System
  • Vitraglas® Lining
  • Zero Inch Clearance to Combustibles
  • Unbalanced Venting
  • Optional Concentric Vent Terminal Kit
  • Hand Hole Cleanout
  • Max Temp - 180°F
  • NSF Construction Available
  • ASME Code Construction Available
  • 1 ½” NPT Dielectric Waterway Fittings
  • Complies with current Ultra Low NOx Requirements
  • All Models Listed with California Energy Commission
  • Low Restriction Brass Drain Valve
  • T&P Relief Valve Installed
  • Four Protective Magnesium Anode Rods, (EF-100T-399, has Two Powered Anode Rods and One Magnesium Anode Rod)
  • Non-CFC Foam Insulation
  • 3–Year Limited Tank Warranty– can be upgraded to 5–Year at additional cost

Product Literature