3.1 General Specifications
The following table lists the specifications for the boiler. Additional specifications about water, gas, electric, and air supplies (venting) appear 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
NHB-055 8 55 51 44 95
12–30 psi 1 in NPT
NHB-080 8 80 74 64 95
NHB-110 10 110 102 89 95
NHB-150 10 150 138 120 95
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.
3. Technical Data
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