GWB8-E: A Gas-Fire Water Boiler You Can Depend On The Lennox® GWB8-E offers heat at the times you need it most. This boiler includes a cast iron heat exchanger and stainless steel burners designed to resist corrosion and oxidation1 and last for years. Effective heat year after year? It’s just as sweet as it sounds. Similar to our GSB8-E product, this boiler has an electronic ignition control that starts the burner only when it’s needed. It further maximizes energy savings with a thick fiberglass insulation and vent damper, which automatically closes when the boiler turns off. In fact, its efficiency ratings can add up to nearly 84% AFUE, leading to a decrease in your utility bills. The GWB8-E makes our installation job even easier. We can easily integrate it with your radiator system and it’s available in a variety of sizes. That means you can install this boiler nearly anywhere in your home. Concerned about using natural gas? That’s okay. The GWB8-E can also be fueled by LP gas instead.2 Having many of the qualities we want to see in a boiler, the GWB8-E has it all: reliable parts, energy efficiency and dependability. Call your Norrell Service Experts Heating & Air Conditioning in at 205-267-0023 to discover more or schedule a free appointment. We’re located in Birmingham, so a relaxing home is closer than you might think. 1 262 and 299 models feature titanium burners. 2 Shipped as natural gas; convertible to LP.