Relax with Reliable Comfort Season After Season.

B & B Heating & Cooling in Florissant knows the colder months seem to go on forever, but we can help you stay cozy and warm. Our sturdy Lennox® oil-fired water boiler is just what you need. This trusty boiler will keep you warm 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.

Consider the COWB3 boiler as an efficient option for your home comfort.

COWB3 Boiler

The Beckett® oil burner sets the example for reliable, fuel-efficient heating. That’s exactly why it’s used in the COWB3 boiler. You can plan on years of nearly noiseless performance from this boiler.

  • 85.2% AFUE*
  • Optional, domestic tankless hot water coil provides hot water for almost no cost throughout the wintertime
  • 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 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 are always ready to serve the Florissant area. If you’re looking for a new boiler or need maintenance on your home’s boiler, call us at 314-838-9800 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.