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 received ENERGY STAR® certification, so it’s met the highest federal guidelines for energy efficiency. And that’s only the beginning. The GWB9-IH boiler also reached an AFUE rating of 90%, which means 90% of the fuel is converted to usable heat. High efficiency products are good for the environment, but what’s in it for you? Well, you could see lower utility bills. Further, you’ll 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 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 boiler is compact and easy to install in smaller spaces. While we’re talking about installation, leave it up to our experts at San Antonio Air Service Experts Heating & Air Conditioning in San Antonio take care of that for you. When you buy through San Antonio Air Service Experts, it just makes sense to have us do your installation and any necessary HVAC repairs, too. Since we’re in San Antonio, we’ll be here when it’s time for an annual tune-up. Call 210-570-9705 or schedule a free appointment today so we can help with all your GWB9-IH needs.