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100 Gallon 250,000 BTU/Hr. 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. 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 (Price subject to change without notice. Check stock before order)