General Specifications
Item NHB-055 NHB-080 NHB-110 NHB-150
Dimensions 17in. (W) x 12in. (D) x 24in. (H) 17in. (W) x 13in. (D) x 24in. (H)
Weight 73 lbs. (33 kg) 80 lbs. (36 kg)
Installation Type Indoor Wall-Hung
Venting Type Forced Draft Direct Vent
Ignition Electronic Ignition
Natural Gas Supply Pressure (from source) 3.5 in.–10.5 in. WC
Propane Gas Supply Pressure (from source) 8.0 in.–13.5 in. WC
Natural Gas Manifold Pressure -0.03 in. WC -0.08 in. WC -0.10 in. WC -0.40 in. WC
Propane Gas Manifold Pressure -0.03 in. WC -0.07 in. WC -0.09 in. WC -0.30 in. WC
Gas Connection Size 3/4 in. NPT
Power Supply
Main Supply 120V AC, 60Hz
Maximum Power
Consumption
Less than 10 amperes
Materials
Casing Cold-rolled carbon steel
Heat Exchangers Primary and Secondary: Stainless Steel
Venting
Exhaust
2 in. or 3 in. PVC, CPVC, approved polypropylene*
2 in. or 3 in. Special Gas Vent Type BH (Class III, A / B / C)
Intake
2 in. or 3 in. PVC, CPVC, polypropylene
2 in. or 3 in. Special Gas Vent Type BH (Class III, A / B / C)
Vent Clearances 0 in. to combustibles
Safety Devices
Flame Rod, APS, Ignition Operation Detector Water Temperature High Limit Switch,
Exhaust Temperature High Limit Sensor, Water Pressure Sensor
Accessories
Navien Manifold System, Condensate Neutralizer Kit, Zone Controller,
System Supply / Return Temperature Sensors, Condensate Neutralizer
Water Pressure 12~30 psi
Water Connection Size (Supply, Return) 1 in NPT
NOTE
This unit may be installed at an altitude of 10,100 ft. (3,078 m) for natural gas, and at 4,500 ft. (1,370 m) for propane. Refer to “4.1.1 PCB DIP
Switches” to correctly adjust the altitude settings. At altitudes above 2,000 ft. (610 m), the boiler’s rating will reduce by 4% for each 1,000
ft. (305m) in altitude.
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