7About 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)
Min Max
NFB-175 17.5 175 161 140 95
12–80 psi 1 ¼ in NPT
NFB-200 19.9 199 183 159 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.
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