Dunkirk’s new Helix VLT condensing boiler features the company’s exclusive Vertical Laser Tube heat exchanger constructed of 316L/444 stainless-steel fin tube. The 444 fins are laser-welded onto the 316L coil, ensuring the highest level of heat transfer and efficiency. With 96 percent AFUE, sealed combustion and a built-in outdoor temperature reset, homeowners can save up to 40 percent on heating bills each year.

Dunkirk. www.dunkirk.com. Circle 37