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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
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Questions and answers
Nevien NFB-175 I **** unable to raise the temp to maximum 180 degrees. It keeps getting set to 145 degrees. Hoe can I raise it to the maximum ?