Reliability and Comfort Every Cold Season Can Be Yours with an Oil-Fired Water Boiler.

Northglenn Heating & Air Conditioning, Inc. in Denver knows the winters seem to go on forever, but we can help you stay cozy and warm. Our sturdy Lennox® oil-fired water boiler is the answer. This boiler will keep your home cozy and even has the option of an attached tankless coil to heat water for your showers, laundry and other household uses for not much additional energy cost.

The COWB3 boiler is an efficient option for your home comfort.

COWB3 Boiler

The Beckett® oil burner sets the standard for reliable, fuel-efficient heating. That’s the reason why it’s used in the COWB3 boiler. You and 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 a very small cost throughout the wintertime
  • Sealed combustion design keeps noise at an unnoticeable level
  • Swing-out burner door for simple cleaning and maintenance
  • Compatible with traditional radiator systems
  • Cast-iron heat exchanger for lasting durability
  • 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 pros are here to serve the Denver area. If you’re looking for a new boiler or need maintenance on your existing boiler, call us at 303-452-4146 today, or schedule 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.