GWB8-E: A Gas-Fire Water Boiler You Can Depend On The Lennox® GWB8-E provides warmth at the times you need it most. This boiler features a cast iron heat exchanger and stainless steel burners built to resist corrosion and oxidation1 and last for years. Reliable heat year after year? It really is that good. Similar to our other boilers, this boiler has an electronic ignition control that turns the burner on 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, the GWB8-E’s efficiency ratings can achieve nearly 84% AFUE, leading to more dollars subtracted from your monthly utility bills. Installion is a breeze when it’s the GWB8-E. It’s easy to integrate with your radiator system and it’s available in nine sizes. That means you can install this boiler virtually anywhere you want. Don’t want your boiler to use natural gas? No problem. 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 Service Experts Heating & Air Conditioning in at 303-647-5853 to learn more or schedule a free appointment. We’re located in Denver, so a comfy home is closer than you might think. 1 262 and 299 models feature titanium burners. 2 Shipped as natural gas; convertible to LP.