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 produces an AFUE rating of 90%, which leads to 90% of the fuel used is converted to heat. We know energy efficiency is great for the environment, but what’s in it for you? First off, you could see lower utility bills. Further, you’ll experience a home that heats up fast 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 will always be the perfect temperature. The GWB9-IH boiler will quietly warm your home for years 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. It may seem like a lot, but all this doesn’t add up to a bulky machine. In fact, this boiler is compact and easy to install in smaller spaces. As long as we’re on the topic of installation, leave it up to our experts at Service Experts Heating & Air Conditioning in Roanoke take care of that for you. When you buy through Service Experts, it just makes sense to have us do your installation and any other necessary HVAC work, too. Since we’re in Roanoke, we’ll be close when it’s time for an annual tune-up. Call 540-302-8645 or schedule a free appointment today so we can assist with all your GWB9-IH needs.