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  • Super condensing efficiency
  • Dual stainless steel heat exchangers
  • SCH40, 2″ PVC venting up to 60′
  • TDR up to 11:1
  • Integrated controls

NHB-150 premium features and benefits

2″ venting up to 65′;
3” up to 150’ (including schedule 40 PVC).

The condensing technology of the dual stainless steel heat exchangers saves energy, reduces greenhouse gasses.

The sophisticated gas flow control system provides a high turndown ratio which reduces energy waste and excessive boiler cycling.

NHB integrated control provides industry-leading options and features including adjustable heat capacity, temp boost for outdoor reset control, adjustable anti-cycle timer and freeze protection.


Dimensions43.2cm W x 61.0cm H x 33.0cm D (17.0″ W x 24.0″ H x 13.0″ D)
Boiler weight36.3 kg (80 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 ” WC
Natural gas manifold pressure-0.4 ” WC
Propage gas manifold pressure-0.3 ” WC
Connection sizesGas inlet3/4″ NPT (hembra)
Power supplyMain supply120V AC, 60Hz
Maximum power consumptionLess than 10A
MaterialsCasingCold rolled carbon steel
Heat exchangersPrimary and secondary heat exchangers: stainless steel
VentingExhaust2″ or 3″ PVC, CPVC, approved polypropylene (see installation manual for more details) 2″ or 3″ special gas vent type BH (Class III, A/B/C)
Intake2″ or 3″ PVC, CPVC, polypropylene 2″ or 3″ special gas vent type BH (Class III, A/B/C)
Vent clearances0″ to combustibles
Safety DevicesFlame rod, APS, gas valve operation detector, ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor
Navien reserves the right to change specifications at any time without prior notice.


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