Navien NCB-180, Service Manual

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16 NCB Service Manual Version 1.0
3. Technical Data
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
1. Ratings are the same for natural gas models converted to propane use.
2. Heating capacity values are 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
Navien Combination Boiler
Space Heating Ratings
Model
Number
1
Heating Input, MBH
Heating Capacity
2
, MBH
Net AHRI Rating Water
3
,
MBH
AFUE
2
, %
Min Max
NCB-180 14 80 74 64 93.5
NCB-210 18 100 92 80 93.6
NCB-240 18 120 109 95 93.3
Item NCB-180 NCB-210 NCB-240
Input Ratings
Min 14,000 BTU/H 18,000 BTU/H 18,000 BTU/H
Max 150,000 BTU/H 180,000 BTU/H 199,900 BTU/H
Water Pressure 15-150 psi
Minimum Flow Rate 0.5 GPM (1.9 L/m)
Flow Rate 77°F (43°C) Temp. Rise 3.4 GPM 4.0 GPM 4.5 GPM
DHW Supply Connection Size 3/4 in NPT
Cold Water Input Connection Size 3/4 in NPT