The first-ever residential combination boiler from A. O. Smith comes with an industry-leading 4.8 gal/min domestic hot water delivery and 95% AFUE, as well as a superior space heating performance with up to 74% more heating capacity than other combination boilers. Easy installation makes the ProLine® XE Combi Boiler a great solution for a wide variety of residential applications.

Available in three sizes: 110,000, 150,000 and 199,999 BTU/hr