Reliability and Comfort Every Cold Season Can Be Yours with an Oil-Fired Water Boiler. Jett's Heating & Air Inc. in McHenry knows the winters seem to go on forever, but we can help you stay comfy and warm. Our reliable Lennox® oil-fired water boiler is just what you need. This boiler will keep you and your family cozy and can accommodate an attached tankless coil to heat water for your showers, laundry and other household requirements for very little additional energy cost. Consider the COWB3 boiler as an efficient option for your home comfort. COWB3 BoilerThe Beckett® oil burner sets the bar for reliable, fuel-efficient heating. That’s the reason why it’s used in the COWB3 boiler. You and your family can plan on years of virtually noiseless performance from this boiler. 85.2% AFUE* Optional, domestic tankless hot water coil provides hot water for a very small cost throughout the cold season Sealed combustion design keeps noise at an unnoticeable level Swing-out burner door for easy cleaning and maintenance Compatible with traditional radiator systems Cast-iron heat exchanger for lasting reliability 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 are always ready to serve the McHenry area. If you’re looking for a new boiler or need maintenance on your current boiler, call us at 815-459-4700 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.