Navien NCB-180E Combi Boiler with Tankless Water Heater
Navien NCB-180E Combi Boiler with Tankless Water Heater Review
The Navien NCB-180E is a 180,000 BTU residential combination boiler in Navien's NCB line, providing both space heating and domestic hot water from a single appliance. The "E" designation indicates the Legacy generation (predecessor to the current NCB-A series).
Specs: 180,000 BTU input, AFUE 95% (condensing), 5.4 GPM DHW at a 70°F rise, fully modulating burner with 5:1 turndown. Built-in buffer for DHW function. PVC condensing venting. 15-year warranty on heat exchanger.
The 180K BTU class is sized for medium-sized homes (1,500-2,200 sq ft) with moderate hydronic space-heat demand. Sits below the NCB-210E and NCB-240 in the combi range.
About $7,500-$9,500 installed depending on hydronic system modifications. Right buyer: medium home replacing aging boiler + separate water heater with a single high-efficiency combi unit. The Legacy NCB-180E is parts-supported through 2032 — buying Legacy today saves $200-$400 over the current NCB-180A2 with identical residential performance.