6
About 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
NHB-055H
8
55
51
44
95
12–30 psi
1 in NPT
NHB-080H
8
80
73
64
95
NHB-110H
10
110
101
88
95
NHB-150H
10
150
136
118
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.
