Relax with Reliable Comfort Season After Season. Twin Air LLC in Manassas knows the cold seasons seem to be endless, but we can help you stay snug and warm. Our reliable Lennox® oil-fired water boiler can help. It will keep your home comfortable and can be equipped with an attached tankless coil to heat water for your showers, laundry and other household requirements for not much additional energy cost. Consider the COWB3 boiler as an efficient option for your home comfort. COWB3 BoilerThe Beckett® oil burner sets the standard for reliable, fuel-efficient heating. That’s exactly why it’s used in the COWB3 boiler. Your family can plan on years of nearly noiseless performance from this boiler. 85.2% AFUE* Optional, domestic tankless hot water coil provides hot water for a very small cost throughout the winter months Sealed combustion design keeps noise at a minimum Swing-out burner door for simple cleaning and maintenance Functions 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 happy to serve the Manassas area. If you’re looking for a new boiler or need maintenance on your existing boiler, call us at 703-754-1062 today, or make 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.