Navien NCB is the first high efficiency tankless condensing combination boiler with the capacity to supply both heat and domestic hot water for larger homes - enough hydronic heat for a whole house, plus hot water to run two showers and a dishwasher all at the same time.
Duel inputs: Up to 120 MBtuh for heating and 199 MBtuh for DHW
4.5 GPM at 77 degree temperature rise for domestic hot water
Turn-down ratio of 6:1 for heat and 11:1 for DHW
Dual stainless steel heat exchangers
Field gas convertibility for NG to LPG
PVC Venting: up to 60 Ft. with 2 in. or 150 Ft with 3 in.