8 About the Boiler
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
Other Specifications
Model Number
1
Heating Input (MBH) Heating
Capacity
2
(MBH)
Net AHRI
Rating Water
3
(MBH)
AFUE
2
(%)
Water
Pressure
Water
Connection Size
(Supply, Return)
Water
Volume
Min Max
NFC-175 18 175 161 140 95
12–80 psi 1 in NPT 4.5 gallons
NFC-200 18 199 183 159 95
Note
1. Ratings are the same for natural gas models converted to propane use.
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 NFC-175 NFC-200
Input Ratings
Min 18,000 BTU/H 18,000 BTU/H
Max 199,900 BTU/H 199,900 BTU/H
Water Pressure 15-150 psi
Minimum Flow Rate 0.5 GPM (1.9 L/m)
Flow Rate 45°F (25°C) Temp. Rise 7.9 GPM
DHW Supply Connection Size
3
/
4
in NPT
Cold Water Input Connection Size
3
/
4
in NPT
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