Preferred

● Up to 90% AFUE
● Cast Aluminum Heat Exchanger
● Water Boiler

Preferred^TM Series BW 4/5 Boiler
● Up to 86% AFUE
● Cast Iron Heat Exchanger
● Water Boiler

Preferred^TM Series BW 3 Boiler
● Up to 84.4% AFUE
● Cast Iron Heat Exchanger
● Water Boiler

Legacy^TM Line BW/BS Boiler
● Up to 81.6% AFUE
● Cast Iron Heat Exchanger
● Water or Steam Boiler