Navien NCB-210E Combi Boiler with Tankless Water Heater
Navien NCB-210E Combi Boiler with Tankless Water Heater Review
The Navien NCB-210E is a residential combination boiler in Navien's NCB line — 210,000 BTU input providing both space heating and domestic hot water from a single appliance. The "E" designation distinguishes this from the NCB-A series (newer generation).
Specs: 210,000 BTU input, AFUE 95% (condensing), 6.0 GPM DHW at a 70°F rise, fully modulating burner with 5:1 turndown ratio. Stainless steel heat exchanger. PVC condensing venting. 15-year warranty on heat exchanger.
The 210K BTU class is sized for medium homes (1,800-2,800 sq ft) with substantial space-heat demand. Sits between the NCB-190 (smaller) and NCB-240 (larger) in the combi range. Right answer for typical medium-sized US homes converting from boiler + separate water heater to a single combi unit.
About $8,000-$11,000 installed depending on hydronic system modifications required. Right buyer: medium home replacing aging boiler + water heater simultaneously with a single high-efficiency combi unit. Conversion timing: combined replacement projects produce best economic case.
Limitations: not a pure DHW product (NPE tankless series is the right choice for DHW-only applications). Single point of failure for both heating and hot water (separate boiler + water heater have independent backup if one fails).