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

With a reliable Lennox® oil-fired water boiler from Oak Grove Heating & Air Conditioning in Hattiesburg, you’ll stay warm and snug—even on winter’s harshest days. And, when you add an optional tankless coil, your high-efficiency boiler can also provide you with hot water for all your household needs, at virtually no cost during the winter months.

See what the COWB3 boiler has to offer.

COWB3 Boiler

You can expect years of quiet performance from the COWB3 boiler. It features the Beckett® oil burner, which is the standard 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 painless cleaning and maintenance
  • Works 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 professionals at Oak Grove Heating & Air Conditioning are always ready to assist with all your boiler needs, whether you need a new boiler or boiler maintenance. Call our Hattiesburg location at 601-268-3486 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.