NFC-250/175H
HIGH EFFICIENCY CONDENSING COMBI-BOILER
- 95% AFUE – Energy Star certified
- DHW 15:1 TDR and heating 15:1 TDR
- 2” venting up to 65’, 3” venting up to 150'
- Advanced controls with intuitive user interface and Setup Wizard
- NEW DHW module with mixing and water adjustment valves
- Built-in powered connections for 3 zone valves or 3 zone pumps
- Common venting with up to 7 NPE units and cascading up to 15 NPE units
- Approved for high altitude up to 10,100 ft. (NG and LP), conversion kits included
- Patented stainless steel fire tube heat exchanger with non-metallic condensate base
NFC-250/175H premium features and benefits
2" venting up to 65' (including schedule 40 PVC).Vent Installation Detector (VID) for added safety.
Dual Venturi system creates better combustion control, turndown ratio and easy field gas conversions.
Patented stainless steel fire tube heat exchanger Navien’s innovative heat exchanger design is ASME‑Certified,“H” Stamped, and reduces high-stress point weld failures common on other combi-boilers.
Advanced user interface with Setup Wizard is made easy with backlit panel, click-wheel control and intuitive text.
Advanced circuitry with built-in control for 3-zone pumps or 3-zone valves.
Easily accessible built-in DHW module includes integrated boiler pump, flow adjustment valve, DHW stainless steel heat exchanger, mixing valve and 3-way valve.
NFC-250/175H QuickFacts
Dimensions
43.9cm W x 85.1cm H x 43.9cm D (17.3" W x 33.5" H x 17.3" D)
Certification Summary
Product approvals
- CSA
- Yes
- SCAQMD 1146.2(NOx, <20ppm)
- Yes
- Low Lead(<0.25%)
- Yes
- ASME Certified
- Yes "H" Stamp
- AHRI Number
- 206368824
- Canadian Registration Number
-
2087.94YT,
2087.91(BC) - Energy star certified
- Yes
Space Heating Ratings
- AFUE, %
- 95.0
- Heating Capacity
- 161,000 BTU/h
Temperature Rise
| Temp Rise | NFC-250/175H |
|---|---|
| 19.4 °C (35 °F) | 40.9 l/m (10.8 GPM) |
| 22.2 °C (40 °F) | 36 l/m (9.5 GPM) |
| 25 °C (45 °F) | 31.8 l/m (8.4 GPM) |
| 27.8 °C (50 °F) | 28.8 l/m (7.6 GPM) |
| 30.6 °C (55 °F) | 26.1 l/m (6.9 GPM) |
| 33.3 °C (60 °F) | 23.8 l/m (6.3 GPM) |
| 37.2 °C (67 °F) | 21.2 l/m (5.6 GPM) |
| 38.9 °C (70 °F) | 20.4 l/m (5.4 GPM) |
| 42.8 °C (77 °F) | 18.5 l/m (4.9 GPM) |
| 44.4 °C (80 °F) | 17.8 l/m (4.7 GPM) |
| 47.2 °C (85 °F) | 16.7 l/m (4.4 GPM) |
| 50 °C (90 °F) | 15.9 l/m (4.2 GPM) |
| 55.6 °C (100 °F) | 14.4 l/m (3.8 GPM) |
Gas Input Ranges
| Model | NFC-250/175H |
|---|---|
| Heating | 13,300 - 175,000 BTU/h |
| DHW | 13,000 - 210,000 BTU/h |
Temperature Setting Ranges
| Item | Temperature Setting Range | |
|---|---|---|
| Space Heating | Supply | 25 - 85 °C (77 - 185 °F) |
| Return | 20 - 70 °C (68 - 158 °F) | |
| DHW | 30 - 60 °C (86 - 140 °F) | |
Ratings
Navien Combination Boiler Space Heating Ratings |
||
|---|---|---|
| Model1 | NFC-250/175H | |
| Heating Input | Min | 13,300 BTU/h |
| Max | 175,000 BTU/h | |
| Heating Capacity2 | 161,000 BTU/h | |
| Net AHRI Rating, Water3 | 140,000 BTU/h | |
| AFUE2, % | 95.0 | |
Other Specifications |
||
| Water pressure | Min | 0.8 kg/cm2 (12 PSI) |
| Max | 5.6 kg/cm2 (80 PSI) | |
| Water Connection Size (Supply, Return) | 1" NPT | |
Navien Condensing Boiler Domestic Hot Water Ratings |
||
|---|---|---|
| Model1 | NFC-250/175H | |
| Input Ratings | Min | 13,000 BTU/h |
| Max | 210,000 BTU/h | |
Other Domestic Hot Water Specifications |
||
| Water pressure | Min | 1.1 kg/cm2 (15 PSI) |
| Max | 10.5 kg/cm2 (150 PSI) | |
| Minimum Flow Rate | 1.9 l/m (0.5 GPM) | |
| Flow Rate 25 °C (45 °F) Temp Rise | 31.8 l/m (8.4 GPM) | |
| DHW Connection Size (Supply, Return) | 3/4" NPT | |
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 systems, etc.
Specifications
| Item | NFC-250/175H | |
|---|---|---|
| Dimensions | 43.9cm W x 85.1cm H x 43.9cm D (17.3" W x 33.5" H x 17.3" D) | |
| Boiler weight | 64 kg (141 lbs) | |
| Boiler Weight With Water | 77.1 kg (170 lbs) | |
| Installation type | Indoor wall-hung | |
| Ignition | Electronic ignition | |
| Natural gas supply pressure (from source) | 3.5 " WC to 10.5 " WC | |
| Propane gas supply pressure (from source) | 8 " WC to 13.5 " WC | |
| Natural gas manifold pressure (min-max) | -0.03 " WC to -0.92 " WC | |
| Propane gas manifold pressure (min-max) | -0.02 " WC to -0.77 " WC | |
| Connection sizes | Gas inlet | |
| Power supply | Main supply | 120V AC, 60Hz |
| Maximum power consumption | Less than 15 amperes | |
| Materials | Casing | Cold-rolled carbon steel |
| Heat exchangers |
Stainless steel |
|
| Venting | Exhaust | 2” or 3” PVC, CPVC, approved polypropylene 2” or 3” special gas vent type BH (Class III, A/B/C) 2” or 3” stainless steel |
| Intake | 2” or 3” PVC, CPVC, polypropylene 2” or 3” special gas vent type BH (Class III, A/B/C) 2” or 3” stainless steel | |
| Vent clearances | 0" to combustibles | |
| Safety Devices | Flame rod, APS, ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor, water pressure sensor, burner high limit fuse, vent installation detector | |
| Temperature setting range | 30 - 60 °C (86 - 140 °F) (up to °C (0 °F) when setting the parameter) | |
Navien reserves the right to change specifications at any time without prior notice. Please refer to www.NavienInc.com to verify you have the most current information.
Navien reserves the right to change specifications at any time without prior notice.