The Dunkirk PSB Gas Steam Boiler combines over 80 years of reliable American craftsmanship with mid-efficiency performance, reaching up to 82.7% AFUE. Its cast iron heat exchanger and titanium burners ensure durability, while the electronic ignition and integral draft diverter enhance convenience and efficiency. Designed for flexible use with natural gas or propane, the PSB is built to offer comfort and efficiency in a compact footprint, making it a solid choice for steam heating.