Relax with Reliable Comfort Season After Season. Holiday Heating & Air Conditioning in Ballwin knows the colder months seem to be endless, but we can help you stay cozy and warm. Our dependable Lennox® oil-fired water boiler is the answer. This trusty boiler will keep you cozy and even has the option of an attached tankless coil to produce hot water for your showers, laundry and other household needs for very little additional energy cost. The COWB3 boiler is an efficient option for your home comfort. COWB3 BoilerThe Beckett® oil burner sets the bar for reliable, fuel-efficient heating. That’s exactly why it’s used in the COWB3 boiler. You and your family can plan on years of almost silent 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 very low 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 here to serve the Ballwin area. If you’re looking for a new boiler or need maintenance on your current boiler, call us at 636-391-7377 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.