Navien NHB Series Installation & Operation Manual page 8

General Specifications
Item
Dimensions
Boiler Weight
Boiler Weight with Water
Installation Type
Venting Type
Ignition
Natural Gas Supply Pressure (from source)
Propane Gas Supply Pressure (from source)
Natural Gas Manifold Pressure
Propane Gas Manifold Pressure
Gas Connection Size
Power Supply
Materials
Venting
Safety Devices
Temperature Setting Range
Item
Space Heating
For more information about the space heating temperature setting range, refer to "11.5.2 Setting the Space Heating Operation" on
Note
page 93.
8 About the Boiler
NFB-301C
Main Supply
Maximum Power
Consumption
Casing
Heat Exchangers
Exhaust
Intake
Vent Clearance
Flame Rod, APS, Ignition Operation Detector
Water Temperature High Limit Switch, Exhaust Temperature High Limit Sensor, Water
Pressure Sensor
Temperature Setting Range
Supply 77–194°F (25-90°C)
Return 68–158°F (20-70°C)
25.1 in (W) × 22.3 in (D) × 32.8 in (H)
243 lb (110 kg)
307 lb (139 kg)
Indoor Wall-Hung
Forced Draft Direct Vent
Electronic Ignition
3.5 in–10.5 in WC
8.0 in–13.5 in WC
-0.06 to -0.87 in WC
-0.01 to -0.92 in WC
120 V AC, 60 Hz
Less than 12 amperes
Cold-rolled carbon steel
Stainless Steel
3 in or 4 in PVC, CPVC, approved polypropylene, approved stainless steel
3 in or 4 in Special Gas Vent Type BH (Class III, A/B/C)
3 in or 4 in PVC, CPVC, polypropylene, stainless steel
3 in or 4 in Special Gas Vent Type BH (Class III, A/B/C)
0 in to combustibles
NFB-399C
278 lb (126 kg)
371 lb (168 kg)
-0.03 to -1.85 in WC
-0.01 to -0.90 in WC
3 / in NPT
4
Remarks
Actual supply and return temperatures vary
depending on the selected outdoor reset
curve.