Specifications - Navien NFC-250/175H Installation Manual

1.3 Specifications

The following tables list the specifications for the boiler. Additional specifications for water, gas, electricity, and
vent connections are provided in the Installation section.
Space Heating Specifications
Navien Condensing Boiler
Space Heating Ratings
Heating
Model
Input (MBH)
Number
1
Min
NFC-250/175H
13.3
NFC-250/200H
1. Ratings are the same for natural gas models converted to propane use.
Note
2. Based on U.S. Department of Energy (DOE) test procedures.
3. The net AHRI water ratings shown are based on a piping and pickup allowance of 1.15. Consult
Navien before selecting a boiler for installations having unusual piping and pickup requirements,
such as intermittent system operation, extensive piping system, etc.
Domestic Hot Water Specifications
Item
Input Ratings
Water Pressure
Minimum Flow Rate
Flow Rate 45°F (25°C) Temp. Rise
DHW Supply Connection Size
Cold Water Input Connection Size
8 About the Boiler
Heating Net AHRI
Capacity Rating Water
2
(MBH)
Max
175 161
199 183
Min
Max
AFUE Water
2
3
(%) Pressure
(MBH)
140 95
6–80 psi
159 95
NFC-250/175H
13,300 BTU/H
210,000 BTU/H
15-150 psi
0.5 GPM (1.9 L/m)
7.9 GPM
/ in NPT
3
4
/ in NPT
3
4
Other Specifications
Water
Water
Connection Size
Volume
(Supply, Return)
4.5
1 in NPT
gallons
NFC-250/200H
13,300 BTU/H
210,000 BTU/H