NCB-250/150H - Condensing Combi-Boiler - 250,000 BTU DHW / 210,000 BTU HTGNavien NCB 250 150H Condensing Combi Boiler 250,000 BTU DHW 210,000 BTU HTG The Navien NCB 250 150H is a 95% AFUE condensing combi boiler that combines powerful space heating and on demand domestic hot water in a single wall hung unit. With a maximum input of 150,000 BTU hr and a net AHRI rating of 120,000 BTU hr, this unit delivers efficient performance for larger residential applications. It offers a 11. 1: 1 turndown ratio for heating and a 15: 1
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