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Navien Condensing Combi-Boiler, NCB-150E

Navien Condensing Combi-Boiler, NCB-150E


The first high efficiency tankless condensing combi-boiler that can do it all. 


Navien NCB-E is the first high efficiency 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.


The Navien NCB-E saves installation time and reduces call backs. In addition, the NCB-E takes up 80% less space than a traditional floor standing boiler and tank water heater. Your customer now has more room, saves energy and enjoys all the hot water they need, whenever they want it.


Dual inputs of up to 120k BTU/H for heating and 199k BTU/H for DHW

  • Supplies all the heat and domestic hot water that most houses require.


PVC Venting

  • Low exhaust gas temperatures allows use of PVC, CPVC, ULC S636 and polypropylene vent systems, reducing installation time and costs. System can use 2" venting for up to 60', or up to 150' with 3" venting.


4.5 GPM@77° temperature rise for domestic hot water

  • Separate stainless steel flat plate heat exchanger for DHW creates the highest flow rate for any combi boiler in the industry.


Low gas pressure operation

  • Our negative pressure gas valve ensures maximum performance all the way down to a minimum gas pressure of 3.5" of water column.


Turn down ratio of 6:1 for heating and 11:1 for DHW

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


Uses existing ½" gas piping

  • Save time and effort in retrofit applications with ½" gas lines for up to 24'.


Dual stainless steel heat exchangers

  • Resist corrosion better than copper to provide longer life.


Space saving design

  • Occupies 80% less space than a traditional floor standing boiler and storage tank.


Field gas convertibility

  • Dual venturi system allows for easy field convertibility from NG to LP operation. Orifice for LP conversion included.

Navien Condensing Combi-Boiler, NCB-150E

  • NCB-150E



    • Super condensing efficiency
    • Dual stainless steel heat exchangers
    • SCH40, 2" PVC venting up to 60'
    • ½" Gas pipe up to 24'
    • Automatic water filling system
    • Integrated controls
  • Gas input

    Space heating 12,000 - 60,000 BTU/H (3.516 - 17.58 kWh)
    Domestic hot water 12,000 - 120,000 BTU/H (3.516 - 35.16 kWh)


    Power Supply

    Main supply 120V AC, 60Hz
    Maximum power consumption 200W (max 2A)



    • 17.0" W x 28.0" H x 12.0" D (43.2cm W x 71.1cm H x 30.5cm D)


    Boiler weight

    • 66 lbs (29.9 kg)


    Installation Type

    • Indoor wall-hung


    Venting Type

    • Forced draft direct vent



    • Electronic ignition


    Hydronic water pressure 12 - 30 PSI (0.844 - 2.109 kg/cm2)
    DHW water pressure 15 - 150 PSI (1.055 - 10.545 kg/cm2)
    Natural gas supply pressure (from source) 3.5 " WC - 10.5 " WC (0.87 Kpa - 2.61 Kpa)
    Propane gas supply pressure (from source) 8 " WC - 13 " WC (1.99 Kpa - 3.23 Kpa)
    Natural gas manifold pressure (min-max) -0.08 " WC - -0.34 " WC (-0.02 Kpa - -0.085 Kpa)
    Propane gas manifold pressure (min-max) -0.08 " WC - -0.3 " WC (-0.02 Kpa - -0.075 Kpa)
    Minimum Flow Rate (DHW) 0.5 GPM (1.893 l/m)



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