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 earned ENERGY STAR® certification, meaning it meets or exceeds federal guidelines for energy efficiency. And that’s only the beginning. The GWB9-IH boiler also achieved an AFUE rating of 90%, which means 90% of the fuel is converted to usable heat. We know energy efficiency is great for the environment, but what’s in it for you? Well, you could start seeing a decrease in your utility bills. But, you’ll also experience a home that warms up quick 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 year after year with its sealed combustion. It’ll stay durable for years, too, because it was created with heavy-gauge steel and includes a baked-on paint finish. These features don’t add up to a large machine. In fact, the GWB9-IH boiler is compact and easy to install in smaller spaces. While we’re talking about installation, just have our professionals at Gordon's Service Experts Heating & Air Conditioning in Oklahoma City take care of that for you. When you buy through Gordon's Service Experts, it just makes sense to have us do your installation and any other necessary HVAC work, too. Since we’re in Oklahoma City, we’ll be close when it’s time for a routine tune-up. Call 405-432-2197 or schedule a free appointment today so we can help with all your GWB9-IH needs.