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 earned 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 translates to 90% of the fuel being converted to usable heat. Yes, being energy efficient helps the environment, but how does it actually affect you you? For starters, 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. Even alone, this exchanger 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 suffer from heating and cooling inconsistencies – it’ll always be just the temperature you want. The GWB9-IH boiler will heat your home with minimal operating sounds 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. These features don’t add up to a large machine. In fact, the GWB9-IH is compact and easy to install in smaller spaces. While we’re talking about installation, just have our staff at Bob Brown Service Experts Heating & Air in Phoenix take care of that for you. When you buy through Bob Brown 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 Phoenix, we’ll be here when it’s time for a routine tune-up. Call 623-243-4517 or schedule a free appointment today so we can assist with all your GWB9-IH needs.