Relax with Reliable Comfort Season After Season.

With a sturdy Lennox® oil-fired water boiler from O'Brien Heating & Air Conditioning in the Main Line, you’ll stay warm and snug—even on winter’s most bitter days. Plus, with the addition of an optional tankless coil, your high-efficiency boiler can also make hot water for all your household needs, at virtually no cost during the winter months.

Find out more about what the COWB3 boiler has to offer.

COWB3 Boiler

Expect years of ultraquiet operation from the COWB3 boiler. It is made with the Beckett® oil burner, which sets the bar for reliable fuel-efficient heating.

  • 85.2% AFUE*
  • Optional, domestic tankless hot water coil provides hot water for very little cost throughout the winter months
  • Sealed combustion design keeps noise very low
  • Swing-out burner door for simple cleaning and maintenance
  • Functions with traditional radiator systems
  • Cast-iron heat exchanger for lasting performance
  • 20-year limited warranty on heat exchanger, 1-year limited warranty on remaining covered parts
COWB3 Boiler
Efficiency Rating (AFUE): up to 85.2

Our boiler professionals at O'Brien Heating & Air Conditioning are always ready to take care of all your boiler needs, whether you need a new boiler or boiler maintenance. Call our the Main Line location at 610-626-2540 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.