Specifications - Navien NFB-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 Max
NFB-175H 175
13.3
NFB-200H 199
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.
Heating Net AHRI
Capacity Rating Water
2
(MBH) (MBH)
160 139
182 158
Other Specifications
AFUE Water
2
3
(%) Pressure
95
6–80 psi
95
Water
Water
Connection Size
Volume
(Supply, Return)
4.5
1 ¼ in NPT
Gallon
About the Boiler 7