Commercial Condensing with the Power to FIT! BFIT, Bryan Boiler’s newest Commercial Condensing Stainless Steel Boiler is now available in sizes 1000, 1250, 1500, 2000, 2500, 3000, and 4000 mbh. The BFIT has 97% Thermal Efficiency and is 46% Smaller than its competitors.  Click on the information below to learn more about the BFIT Series.