Specifications - Navien NCB-180 Installation & Operation Manual

1.3 Specifications

The following tables list the specifications for the boiler. Additional specifications about water, gas, electric, and air supplies (venting) appear in
the Installation section.
Space Heating Specifications
Heating Input, MBH
Model Number
1
Min
NCB-180 14
NCB-210 18
NCB-240 18
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.
4. Space heating system water pressure is 12–30 psi.
5. System connection diameter is 1 inch (NPT) for space heating supply and return pipings.
Domestic Hot Water Specifications
Item
Min
Input Ratings
Max
Water Pressure
Minimum Flow Rate
Flow Rate 77°F (43°C) Temp. Rise
DHW Supply Connection Size
Cold Water Input Connection Size
8 About the Boiler
Navien Combination Boiler
Space Heating Ratings
Heating Capacity
Max
80 74
100 92
120 109
NCB-180
14,000 BTU/H
150,000 BTU/H
15-150 psi
0.5 GPM (1.9 L/m)
3.4 GPM
/ in NPT
3
4
/ in NPT
3
4
, MBH Net AHRI Rating Water
2
64
80
95
NCB-210
18,000 BTU/H
180,000 BTU/H
4.0 GPM
, MBH AFUE , %
3 2
93.5
93.6
93.3
NCB-240
18,000 BTU/H
199,900 BTU/H
4.5 GPM