GWB8-E: A Gas-Fire Water Boiler You Can Depend On The Lennox® GWB8-E provides warmth effectively when you need it most. This boiler uses a cast iron heat exchanger and stainless steel burners created to prevent corrosion and oxidation1 and last for years. Effective heat year after year? It can’t get much better than that. Similar to our other boilers, this boiler has an electronic ignition control that turns the burner on only when it’s needed. Additional energy savings are possible with the GWB8-E’s thick fiberglass insulation and vent damper, which closes by itself when the boiler turns off. In fact, the GWB8-E’s efficiency ratings can add up to nearly 84% AFUE, leading to reduced energy bills. Installion is a breeze when it’s the GWB8-E. We can easily integrate it with your radiator system and it’s available in multiple sizes. That means you can install this boiler virtually anywhere you want. Prefer not to use natural gas? That’s fine. The GWB8-E can alternatively be fueled by LP gas instead.2 Containing three qualities we want to see in a boiler, the GWB8-E has it all: well-made parts, energy efficiency and dependability. Call your Strogen's Service Experts Heating & Air Conditioning in at 603-923-4570 to find out more or schedule a free appointment. We’re located in Rochester, 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.