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 in their class. All models can vent vertically or horizontally and are also approved for unbalanced, direct-vent closed combustion applications or those applications that require inside air for combustion. PVC, ABS, and CPVC pipe is permitted on the entire venting system. The eF Series® is extremely quiet, a feature building owners, managers and occupants will appreciate.

• Up To 99.1% Efficiency!
• Incredible Installation Flexibility & Quiet Operation
• 8 models (60 - 100 gallon capacities)
• 125,000 - 399,999 BTU/Hr.
• Thermostat adjustable up to 180° F
• ASME and Non-ASME construction available
• Optional concentric vent kit termination

(Sample model numbers include: EF‑60T‑125‑3X, EF‑100T‑150‑3X, EF‑100T‑300‑3X, & EF‑100T‑399‑3X)

Standard Features

• 99.1% thermal efficiency
• 60 Gallon in 125,000, 150,000 and 199,999 BTU's
• 100 Gallon in 150,000, 199,999 , 250,000, 300,000, and 399,999 BTU's
• Versatile venting
• Electronic controls
• Premix power burner
• Submerged combustion chamber
• Zero inch clearance chamber
• Three pass flue system
• Four Protective magnesium anode rods
• Factory installed Hydrojet® Sediment Reduction System
• Handhole cleanout
• Vitraglas® lined tank
• Factory installed dielectric fittings
• T&P relief valve
• Brass drain valve
• Non-CFC foam insulation