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 Commercial Condensing Boiler
Space Heating Ratings
Other Specifications
Model
Number
1
Heating Input (MBH)
Gross
Output
2
(MBH)
Net AHRI
Rating Water
3
(MBH)
Thermal
Efficiency
2
(%)
Boiler Water
Content
(Gallons)
Water
Pressure
Water
Connection Size
(Supply, Return)
Min. Max.
NFB-301C 20 301 293 255 97.5 7.6
12-160 psi
1¼ in NPT
NFB-399C 26 399 389 338 97.5 9.6 1½ in NPT
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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