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 really is that good. Similar to our other boilers, 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 closes on its own when the boiler turns off. In fact, its efficiency ratings can achieve nearly 84% AFUE, leading to reduced energy bills. Installion is a breeze when it’s the GWB8-E. It’s simple to connect 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: well-made parts, energy efficiency and dependability. Call your Bob Brown Service Experts Heating & Air in at 623-243-4517 to find out more or schedule a free appointment. We’re located in Phoenix, so a cozy home is closer than you might think. 1 262 and 299 models feature titanium burners. 2 Shipped as natural gas; convertible to LP.