NCB-190/080H - Condensing Combi-Boiler - 160,000 BTU DHW / 80,000 BTU HTGNavien NCB 190 080H Condensing Combi Boiler 160,000 BTU DHW 80,000 BTU HTG The Navien NCB 190 080H is a high efficiency condensing combi boiler that delivers both hydronic space heating and domestic hot water from a single, compact wall hung unit. With a 95% AFUE rating and up to 80,000 BTU hr heating input, it provides consistent warmth and efficiency for a wide range of home sizes. The domestic hot water system delivers up to 160,000 BTU hr with a