The COWB3 Boiler: Efficient Performance for Years You never know just how harsh the winter will be, so why risk your family’s comfort? Be prepared for the worst – and cozy throughout the season – with a Lennox® COWB3 boiler. This standard-efficiency heating system includes a Beckett® oil burner, the product that set a benchmark for fuel-efficient heating. A domestic hot water coil takes your energy efficiency further by providing hot water at virtually no additional cost. Winter temperatures are one thing, but it’s the wind that really chills our bones. That’s maybe the biggest reason why we love the COWB3 system’s sealed-combustion design. Not only is your heating quiet, it’s also draft-free. What makes this product even better is its simple integration with conventional radiator systems. When you buy a COWB3 boiler through your Donelson Air Service Experts Heating & Air Conditioning in Nashville, you’ll get reliability, durability and expert furnace installation service. Ready to see what a a COWB3 boiler can do for you? This boiler is available in three models so you can pick the best fit for your home. Schedule your free appointment with Donelson Air Service Experts in Nashville online or call 615-953-9885 to get started.