GWB9-IH Boilers: High-Efficiency with Faster Heat Transfer If you’re looking for a high-efficiency boiler, look no further than the Lennox® GWB9-IH. 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 reached an AFUE rating of 90%, which means 90% of the fuel is converted to usable heat. Yes, being energy efficient helps the environment, but how does it actually affect you you? Well, you could start seeing a decrease in your utility bills. But, you’ll also experience a home that heats up fast thanks to the boiler’s cast-aluminum heat exchanger. This exchanger is stunning – it alone can transfer 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 provide warmth quietly 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 bulky 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 Levy & Son in Dallas take care of that for you. When you buy through Levy & Son, it just makes sense to have us do your installation and whatever HVAC repairs come up down the road, too. Since we’re in Dallas, we’ll be here when it’s time for a routine tune-up. Call 469-250-0932 or schedule a free appointment today so we can assist with all your GWB9-IH needs.