Navien Condensing Gas Combination Boiler NCB-210


  • 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
  • Ultra Condensing Efficiency

    Ultra Condensing Efficiency

    • Navien’s Condensing Technology offers the high efficiency.
    • Money and energy savings over tank type water heaters and traditional water heaters.
  • Two Stainless Steel Heat Exchangers

    Two Stainless Steel Heat Exchangers

    • Provides longer life expectancy as they are highly resistant to corrosion and erosion compared to copper heat exchangers.
    • Reduces minerals deposits.
  • Low NOx Emissions (≤ 20ppm)

    Low NOx Emissions (≤ 20ppm)

    • New metal fiber burner is designed to deliver a consistent air/gas mixture improving combustion efficiency.
    • Result in less acid rain and less green house effect.
    • Comply with SCAQMD 1146.2 strict NOx emissions standard.
  • 2

    2” PVC, CPVC, Polyprophylene Venting Up To 60’

    • 2” venting option allows for a flue to be pulled through the existing vent.
    • 3” vents can be used up to 150’ with standard 2” x 3” adapters.
  • Better Adaptability to Gas System

    Utilizes Existing 1/2″ Gas Line

    • The negative pressure gas valve and fan with dual venturi operation allows for better adaptability to low gas pressure applications.
    • Makes it possible for the NPE to be installed ½” gas lines up to 24’.
  • Field Convertible

    Field Convertible

    • NCB models allow for easy convertibility from NG to LP.
  • Two Stainless Steel Heat Exchangers

    Where Technology Meets Ecology, Combination Boiler

    • The ideal solution for customers who need both domestic hot water and a space heating application.
    • Heats water when needed, making it environmentally sound as well as cost efficient.
  • Low NOx Emissions (≤ 20ppm)

    Hydronic Heating Benefits

    • Clean: little chance to cause dust or lower humidity because there is no air movement.
    • Silent: offers silent heating because no blowers are needed for forced circulation.
    • Comfort: keeps floors warm but indoor air fresh, making people feel warm and comfortable.
    • Coverage: radiant heat makes heating from floor to ceiling possible.
    • Economical: radiant heat in the floors can transmit warmth throughout the house hours after turning off the heater.
  • Ultra Condensing Efficiency

    Automatic Water Filling System

    • Automatically fills water into space heating pipes when the unit senses a water shortage.
  • Ultra Condensing Efficiency

    Powerful Anti-Freeze Feature

    • The Combi’s built-in Control System is designed to keep the unit’s plumbing frost free in winter conditions.
Data Field NCB-210
Gas Input Space Heating 18,000-100,000 BTU/H
Domestic Hot Water 18,000-180,000 BTU/H
Flow Rate (DHW) 77°F (43°C) Temp Rise 4.0 GPM (15.1 L/m)
Dimensions 17″(W) x 28″(H) x 12″(D)
Weight 84 lbs (38kg)
Installation Type Indoor Wall-Hung
Venting Type Forced Draft Direct Vent
Ignition Electronic Ignition
Water Pressure (Hydronic/DHW) 12-30 PSI / 15-150 PSI
Natural Gas Supply Pressure (from source) 3.5″-10.5″ WC
Propane Gas Supply Pressure (from source) 8.0″-13.5″ WC
Natural Gas Manifold Pressure (min to max) -0.05″ WC to -0.36″ WC
Propane Gas Manifold Pressure (min to max) -0.1″ WC to -0.66″ WC
Minimum Flow Rate (DHW) 0.5 GPM (1.9 L/m)
Connection Sizes Heating Supply/Return 1″ NPT
DHW Inlet/Outlet 3/4″ NPT
Gas Inlet 3/4″ NPT
Auto Feeder 1/2″ NPT
Condensate Outlet 1/2″ NPT
Power Supply Main Supply 120V AC, 60Hz
Maximum Power Consumption 200W (up to 2 amperes)
Materials Casing Cold Rolled Carbon Steel
Heat Exchangers Primary/Secondary Heat Exchanger: Stainless Steel DHW Heat Exchanger: Stainless Steel
Venting Exhaust 2” or 3″ PVC, CPVC, Polypropylene 2” or 3″ Special Gas Vent Type BH (Class II, A/B/C)
Intake 2” or 3″ PVC, CPVC, Polypropylene 2” or 3″ Special Gas Vent Type BH (Class II, A/B/C)
Vent Clearances 0″ to Combustibles
Safety Devices Flame Rod, APS, Gas Valve Operation Detector, Ignition Operation Detector, Water Temperature High Limit Switch, Exhaust Temperature High Limit Sensor