GWB8-E: A Gas-Fire Water Boiler You Can Depend On The Lennox® GWB8-E offers heat just when you need it most. This boiler features a cast iron heat exchanger and stainless steel burners created to prevent corrosion and oxidation1 and last for years. Reliable heat year after year? It can’t get much better than that. Similar to our GSB8-E product, 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 by itself when the boiler turns off. In fact, the GWB8-E’s efficiency ratings can reach nearly 84% AFUE, leading to more dollars subtracted from your monthly utility bills. The GWB8-E makes our installation job even easier. It’s simple to connect with your radiator system and it’s available in nine sizes. That means you can install this boiler nearly anywhere in your house. Concerned about using natural gas? No problem. The GWB8-E can also be fueled by LP gas instead.2 Featuring most all the qualities we want to see in a boiler, the GWB8-E has it all: well-made parts, energy efficiency and dependability. Call your Strand Brothers Service Experts Heating & Air Conditioning in at 512-596-1257 to learn more or schedule a free appointment. We’re located in Austin, 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.