8
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
NCB-190/060H
11
60
56
49
95.0
12-30 psi
1 in NPT
NCB-190/080H
11
80
74
64
95.0
NCB-240/110H
13
110
102
89
95.0
NCB-240/130H
13
130
120
104
95.0
NCB-250/150H
14
150
138
120
95.0
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.
Domestic Hot Water Specifications
Item
NCB-
190/060H
NCB-
190/080H
NCB-
240/110H
NCB-
240/130H
NCB-
250/150H
Input Ratings
Min
10,700
10,700
13,300
13,300
14,000
Max
160,000
160,000
199,900
199,900
210,000
Water Pressure
15-150 psi
Minimum Flow Rate
0.5 GPM (1.9 L/m)
Flow Rate
(DHW)
35°F (19°C)
Temp Rise
8.2 GPM
(31.1 L/m)
10.4 GPM
(39.5 L/m)
10.8 GPM
(40.9 L/m)
45°F (25°C)
Temp Rise
6.4 GPM
(24.2 L/m)
7.9 GPM
(30 L/m)
8.4 GPM
(31.8 L/m)
67°F (37°C)
Temp Rise
4.3 GPM
(16.2 L/m)
5.4 GPM
(20.3 L/m)
5.6 GPM
(21.2 L/m)
77°F (43°C)
Temp Rise
3.7 GPM
(14.0 L/m)
4.7 GPM
(17.8 L/m)
4.9 GPM
(18.5 L/m)
DHW Supply Connection Size
3/4 in NPT
Cold Water Input Connection
Size
3/4 in NPT
Summary of Contents for NCB-190/060H
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