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  • Smart controls LCD display, quick dial wheel & Setup Wizard
  • Advanced stainless steel dual heat exchangers
  • 15:1 DHW and up to 10:1 heating TDR
  • Field convertible gas system (NG/LP) up to 10,100 ft.
  • Capable of cascading up to 15 NPE water heaters
  • Capable of common venting up to 7 NPE water heaters
  • Built-in 3 zone pumps and 3 zone valves powered connections
  • 2” venting up to 65′ and 3” venting up to 150′

NCB-240/130H premium features and benefits

2″ PVC venting up to 65 feet including economical schedule 40 PVC.Vent Installation Detector (VID) for added safety.

Dual Venturi system creates better combustion control and turndown ratio and easy field gas conversions.

Easily accessible built-in DHW module includes integrated boiler pump, flow adjustment valve, DHW stainless steel heat exchanger, mixing valve and 3-way valve.

Durable dual condensing stainless steel heat exchangers recover extra heat for maximum efficiency.

Advanced user interface with Setup Wizard is made easy with backlit panel, click-wheel control and intuitive text.


Dimensions43.9cm W x 74.4cm H x 32.5cm D (17.3″ W x 29.3″ H x 12.8″ D)
Boiler weight43.5 kg (96 lbs)
Boiler Weight With Water46.3 kg (102 lbs)
Installation typeIndoor wall-hung
Venting typeForced draft direct vent
IgnitionElectronic ignition
Natural gas supply pressure (from source)3.5 ” WC to 10.5 ” WC
Propane gas supply pressure (from source)8 ” WC to 13.5 ” WC
Natural gas manifold pressure (min-max)-0.06 ” WC to -0.24 ” WC
Propane gas manifold pressure (min-max)-0.06 ” WC to -0.26 ” WC
Connection sizesGas inlet 
Power supplyMain supply120V AC, 60Hz
Maximum power consumptionUp to 15 amperes
MaterialsCasingCold-rolled carbon steel
Heat exchangerstainless steel
VentingExhaust2″ or 3″ PVC, CPVC, approved polypropylene 2″ or 3″ special gas vent type BH (Class III, A/B/C) 2″ or 3″ stainless steel
Intake2″ or 3″ PVC, CPVC, polypropylene 2″ or 3″ special gas vent type BH (Class III, A/B/C) 2″ or 3″ stainless steel
Vent clearances0″ to combustibles
Safety DevicesFlame Rod, APS, Ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor, water pressure sensor, burner
Temperature setting range30 – 60 °C (86 – 140 °F) (up to °C (0 °F) when setting the parameter)
Navien reserves the right to change specifications at any time without prior notice.


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