Relax with Reliable Comfort Season After Season.

B & G HVAC in Marshalltown knows the colder months seem to be endless, but we can help you stay comfy and warm. Our dependable Lennox® oil-fired water boiler can help. This trusty boiler will keep you and your family cozy and can accommodate an attached tankless coil to provide hot water for your showers, laundry and other household uses for not much 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 the reason why it’s used in the COWB3 boiler. 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 winter months
  • Sealed combustion design keeps noise at an unnoticeable level
  • Swing-out burner door for simple cleaning and maintenance
  • Functions with traditional radiator systems
  • Cast-iron heat exchanger for lasting reliability
  • 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 happy to serve the Marshalltown area. If you’re looking for a new boiler or need maintenance on your current boiler, call us at 641-752-3429 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.