Navien NFC-250/175H, Руководство по установке, Страница: 8 / 151

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)
Water
Volume
Min Max
NFC-250/175H
13.3
175 161 140 95
6–80 psi 1 in NPT
4.5
gallons
NFC-250/200H 199 183 159 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.
Domestic Hot Water Specifications
Item NFC-250/175H NFC-250/200H
Input Ratings
Min 13,300 BTU/H 13,300 BTU/H
Max 210,000 BTU/H 210,000 BTU/H
Water Pressure 15-150 psi
Minimum Flow Rate 0.5 GPM (1.9 L/m)
Flow Rate 45°F (25°C) Temp. Rise 7.9 GPM
DHW Supply Connection Size
3
/
4
in NPT
Cold Water Input Connection Size
3
/
4
in NPT