Relax with Reliable Comfort Season After Season. O'Brien Heating & Air Conditioning in the Main Line knows the winters seem to go on forever, but we can help you stay comfy and warm. Our dependable Lennox® oil-fired water boiler is just what you need. It will keep your home comfortable and even has the option of an attached tankless coil to heat water for your showers, laundry and other household needs for not much additional energy cost. For an efficient home comfort option, look at the COWB3 boiler. COWB3 BoilerThe Beckett® oil burner sets the standard for reliable, fuel-efficient heating. That’s absolutely why it’s used in the COWB3 boiler. 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 very little cost throughout the cold season Sealed combustion design keeps noise at an unnoticeable level Swing-out burner door for painless 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 professionals are happy to serve the the Main Line area. If you’re looking for a new boiler or need maintenance on your home’s boiler, call us at 610-257-7035 today, or set up 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.