Specifications - Navien NFC-175 Installation & Operation 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
Heating Input (MBH)
Model Number
1
Min
NFC-175 18
NFC-200 18
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
Navien Condensing Boiler
Space Heating Ratings
Heating
Capacity
Max
(MBH)
175 161
199 183
Min
Max
Net AHRI
Rating Water AFUE (%)
2 3 2
(MBH)
140 95
159 95
NFC-175
18,000 BTU/H
199,900 BTU/H
Other Specifications
Water
Water
Connection Size
Pressure
(Supply, Return)
12–80 psi 1 in NPT
NFC-200
18,000 BTU/H
199,900 BTU/H
15-150 psi
0.5 GPM (1.9 L/m)
7.9 GPM
/ in NPT
3
4
/ in NPT
3
4
Water
Volume
4.5 gallons