GWB9-IH Boilers: High-Efficiency with Faster Heat Transfer If you’re searching for a high-efficiency boiler, the Lennox® GWB9-IH is the model for you. This boiler has achieved ENERGY STAR® certification, so it’s met the highest federal guidelines for energy efficiency. But that’s not all. The GWB9-IH boiler also achieved an AFUE rating of 90%, which means 90% of the fuel is converted to usable heat. Yes, being energy efficient helps the environment, but what’s in it for you? For starters, you could start seeing a decrease in your utility bills. Another nice benefit is that you may experience a home that heats up quicker thanks to the boiler’s cast-aluminum heat exchanger. This exchanger alone transfers heat three times faster than those made with cast iron. An electronic ignition control will monitor water temperature and turn the boiler on only when necessary, so your home won’t be too hot or too cold. It’ll be just right. The GWB9-IH boiler will quietly warm your home for years to come with its sealed combustion. It’ll stay durable for years, too, since it was made with heavy-gauge steel and has a baked-on paint finish. It may seem like a lot, but all this doesn’t add up to a massive machine. In fact, the GWB9-IH is compact and easy to install in smaller spaces. Speaking of installation, leave it up to our staff at Donelson Air Service Experts Heating & Air Conditioning in Nashville take care of that for you. When you buy through Donelson Air Service Experts, it just makes sense to have us do your installation and whatever HVAC repairs come up down the road, too. Since we’re in Nashville, we’ll be close when it’s time for a routine tune-up. Call 615-953-9885 or schedule a free appointment today so we can assist with all your GWB9-IH needs.