Relax with Reliable Comfort Season After Season.

With a dependable Lennox® oil-fired water boiler from B & B Heating & Cooling in Florissant, you’ll stay warm and snug—even on winter’s harshest days. And, with the addition of an optional tankless coil, your high-efficiency boiler can also heat water for all your household needs, for very little money during the winter months.

See what the COWB3 boiler has to offer.

COWB3 Boiler

Expect years of near-silent operation from the COWB3 boiler. It features the Beckett® oil burner, which is the standard for predictable fuel-efficient heating.

  • 85.2% AFUE*
  • Optional, domestic tankless hot water coil heats hot water for almost no cost throughout the cold season
  • Sealed combustion design keeps noise at a minimum
  • Swing-out burner door for painless 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 B & B Heating & Cooling are here for you to take care of all your boiler needs, whether you want a new boiler or boiler maintenance. Call our Florissant location 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.