Navien NCB-250/150H Condensing Combi-Boiler, 150,000 BTU Heating / 210,000 BTU Hot Water

The Navien NCB-250/150H puts a condensing heating boiler and an on-demand water heater in one wall-hung cabinet. It delivers up to 150,000 BTU/h for hydronic heat and up to 210,000 BTU/h for domestic hot water, and it is sized for large homes where heating demand and hot water demand peak together. One unit, one vent and one gas line replace a boiler and a tank, freeing up floor space in the mechanical room.

• 150,000BTU/h heating input
• 210,000BTU/h DHW input
• 95% AFUEcondensing
• 15:1DHW turndown

Why it earns its place on the wall

• Two jobs, one cabinet. Space heating and endless hot water from a single wall-hung unit.
• Deep modulation. Up to 11:1 on heating and 15:1 on hot water keeps the burner matched to the load and avoids short-cycling.
• Dual stainless steel heat exchangers for corrosion resistance and long life.
• Built-in zone control connections for pumps and valves simplify multi-zone systems.
• Field convertible from natural gas to propane, with flexible PVC, CPVC, polypropylene or stainless venting.
• NaviLink ready for remote monitoring from your phone (controller sold separately).

Specifications

Good to know

• Gas appliances must be installed by a licensed professional following the manufacturer’s installation manual and local codes. Manufacturer warranty terms depend on professional installation and registration.
• Specifications are from the manufacturer. Check the current spec sheet and sizing guide before ordering.
• Large units ship by ground freight. You will receive tracking when your order leaves.
• Questions on sizing or venting? Call +1 901-563-1990 or email support@mouchllc.com before you buy.