Relax with Reliable Comfort Season After Season. With a sturdy Lennox® oil-fired water boiler from Rapids Sheet Metal Works Inc in Wisconsin Rapids, you’ll stay warm and snug—even on winter’s most bone-chilling days. Plus, with the addition of an optional tankless coil, your high-efficiency boiler can also heat water for all your household needs, at virtually no cost during the winter months. Read more about the COWB3 boiler. COWB3 BoilerYou will enjoy years of quiet heating from the COWB3 boiler. It features the Beckett® oil burner, which sets the standard for predictable fuel-efficient heating. 85.2% AFUE* Optional, domestic tankless hot water coil provides hot water for a very small cost throughout the wintertime Sealed combustion design keeps noise very low Swing-out burner door for painless cleaning and maintenance Compatible with traditional radiator systems Cast-iron heat exchanger for lasting durability 20-year limited warranty on heat exchanger, 1-year limited warranty on remaining covered parts Efficiency Rating (AFUE): up to 85.2 Product Brochure Contact Us to Learn More Our boiler experts at Rapids Sheet Metal Works Inc are always ready to take care of all your boiler needs, whether you want a new boiler or boiler maintenance. Call our Wisconsin Rapids location at 715-421-5555 today, or schedule your appointment online. *Annual Fuel Utilization Efficiency (AFUE) measures how efficient the appliance is in converting its fuel’s energy into heat over the course of a year.