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Condensing Combi-Boiler


Optimized for ultimate combi-boiler DHW performance

NCB-H offers industry leading DHW features including the highest maximum BTU/h for DHW (210,000), highest flow rate of 5.4 GPM at 70° rise and a DHW turndown ratio of 15:1.

House section ad v10 nfc-h shape blue warped dhw icons copy 500

Aim high with Navien...
High efficiency, High output,
High performance, all in one
compact combi

  • Highest DHW maximum BTU’s in residential combi-boilers...
    up to 210,000 per hour

  • Highest DHW flow rate @ 70°F rise...
    up to 5.4 GPM

  • Highest number of BTU sizes for
    the North American residential
    combi-boiler market

  • Highest residential combi DHW TDR...
    15:1 for all models

  • Highest residential combi heating
    TDR... up to 11:1

  • Highest number of built-in zone controls for valves or pumps... up to three

  • Highest full lineup 2" PVC venting lengths... up to 65 feet

  • Highest number of cascade capable
    units with NPE tankless water heaters... up to 15

  • High altitude certification... up to 10,100 feet (NG or LP)
  • Lowest minimum fire BTU for residential combi-boilers... as low as 10,700

New Navien NCB-H... the complete combi package and no compromises 

Navien's innovation and technological advancements have done it again. The new NCB-H is taking combi performance to the highest levels. As the competition tries to get closer, Navien ingenuity keeps advancing their lead.


COMPARE these advantages and see why NCB-H combis are the right fit for small and large homes


  • Ncb-h-feature-dual-heatexcher2

    Dual stainless steel heat exchangers for heating

    Durable stainless steel heat exchangers resist corrosion, resulting in longer life and improved heat recovery from flue gases for superior efficiency.

  • Nfc-feature-flat-plate

    Up to 5.4 GPM @ 70°F temperature rise for DHW

    Separate stainless steel flat plate heat exchanger for DHW creates the lightest flow rates for any combi-boiler in the industry.

  • Ncb-h-feature-dual-venturi

    Dual Venturi and field gas convertibility

    Dual Venturi system creates better combustion control and turndown ratio. Orifice conversion kit for easy field gas convertibility from NG to LP is included with every NCB-H Series combi-boiler.

  • Ncb-h-feature-access-dhw2

    Easy access to DHW module
    and valves

    All components of DHW module including water feed valve, flow adjustment valve, mixing valve and 3-way valve are right behind circuit board for easy serviceability.

  • Ncb-h-feature-lownoise

    Low noise levels

    Installations in or near media rooms, recreation rooms or any living areas of the house are possible with the quiet running NCB-H combi-boilers.

  • 10-1-ratio-nfb-2

    TDR 15:1 for DHW and up to 11:1 for heating

    The sophisticated gas flow control system provides a high turndown ratio, reducing energy waste and excessive boiler cycling and enhances temperature control for DHW.

Dual stainless steel heat exchanger

Designed for exeptional heating performance and longevity

Heatexchanger 3d ncb h-2022

Built-in DHW module now with
higher performance

Navien’s NCB-H generates enough hot water to run up to 3 showers and a dishwasher at the same time.


Separate DHW stainless steel flat plate heat exchanger

Navien’s new innovative domestic hot water heat exchanger now generates even more hot water, giving customers the ability to run up to 3 showers and a dishwasher, all at the same time.


Integrated boiler pump for space heating and DHW. No need for an external boiler pump saving installation time, space and costs. 

DHW SS flat plate heat exchanger 5.4 GPM @ 70°F temperature rise. One of the highest flow rates in the industry.

New mixing valve.

New easy access 3-way valve.

New flow adjustment valve. 

Water feed valve.


Expanded DHW capability

For increased domestic hot water flow demand, the NCB-H
can be cascaded and common vented with up to 15 of our NPE tankless water heaters.

Ncb-h npe-2 w commonventcollar drain newpvcs x3

NCB-H Models

Max HTG Input: 60,000 BTU/h
Max DHW Input: 160,000 BTU/h
Indoor wall-hung
Navien NCB-190/060H condensing tankless combi-boiler
View model
Max HTG Input: 80,000 BTU/h
Max DHW Input: 160,000 BTU/h
Indoor wall-hung
Navien NCB-190/080H condensing tankless combi-boiler
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Max HTG Input: 110,000 BTU/h
Max DHW Input: 199,900 BTU/h
Indoor wall-hung
Navien NCB-240/110H condensing tankless combi-boiler
View model
Max HTG Input: 130,000 BTU/h
Max DHW Input: 199,900 BTU/h
Indoor wall-hung
Navien NCB-240/130H condensing tankless combi-boiler
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Max HTG Input: 150,000 BTU/h
Max DHW Input: 210,000 BTU/h
Indoor wall-hung
Navien NCB-250/150H condensing tankless combi-boiler
View model
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