Navien NFC-250/175H Installation Manual page 10

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
35°F (19°C) Temp Rise
Flow Rate
45°F (25°C) Temp Rise
(DHW)
67°F (37°C) Temp Rise
Gas Connection Size
Main Supply
Power Supply
Maximum Power
Consumption
Casing
Materials
Heat Exchangers
Exhaust
Venting
Intake
Vent Clearance
Safety Appliances
Temperature Setting Range
Item
Supply
Space
Heating
Return
DHW
For more information about the space heating temperature setting range, refer to "11.5.2 Setting the
Note
Space Heating Operation" on page 112.
10 About the Boiler
NFC-250/175H
17.3 in (W) x 17.3 in (D) x 33.5 in (H)
Indoor Wall-Hung
Forced Draft Direct Vent
Electronic Ignition
3.5 in–10.5 in WC
8.0 in–13.0 in WC
-0.03 to -0.92 in WC
-0.02 to -0.77 in WC
10.4 GPM (39.5 L/m)
7.9 GPM (30.0 L/m)
5.4 GPM (20.3 L/m)
120V AC, 60Hz
Less than 15 amperes
Cold-rolled carbon steel
2 in or 3 in PVC, CPVC, approved polypropylene*
2 in or 3 in Special Gas Vent Type BH (Class III, A/B/C)
2 in or 3 in Stainless Steel
2 in or 3 in PVC, CPVC, polypropylene
2 in or 3 in Special Gas Vent Type BH (Class III, A/B/C)
2 in or 3 in Stainless Steel, ABS
0 in to combustibles
Flame Rod, APS, Ignition Operation Detector
Water Temperature High Limit Switch, Exhaust Temperature
High Limit Sensor, Water Pressure Sensor, Burner High Limit
Fuse, Vent Installation Detector (VID)
Temperature Setting Range
77–185°F (25-85°C)
68–158°F (20-70°C)
86°F-140°F (30°C-60°C)
NFC-250/200H
141 lb (64 kg)
170 lb (77 kg)
/ in NPT
3
4
Stainless Steel
Remarks
Actual supply and return
temperatures vary depending
on the selected outdoor reset
curve.