NPE-180S2 QuickFacts
Dimensions
43.9cm W x 69.6cm H x 33.5cm D (17.3″ W x 27.4″ H x 13.2″ D)
- Front view of NPE-180S2 condensing tankless water heater
- Overhead view of NPE-180S2 condensing tankless water heater
- Bottom view of NPE-180S2 condensing tankless water heater
- NPE-180S2 condensing tankless water heater diagram legend
Certification Summary
| All NPE-2 models convertible NG ↔ LP |
Yes |
| CSA |
Yes |
| NSF (Standard 5) |
Yes |
| Low Lead (<0.25 percent) |
Yes |
| SCAQMD 1146.2 (NOx <20ppm) |
Yes |
| AHRI number |
206368360 |
| Energy Star certified |
Yes |
| ANCE NOM certified |
Yes |
Efficiency Ratings
| Uniform Energy Factor (UEF) |
0.96 |
| MAX l/m (37°C Rise) |
4.3 |
| Annual Energy Consumption (NG) |
177.0 therms/year |
| Annual Energy Consumption (LP) |
734.4 L (194 gal) |
| Natural Gas Estimated Cost |
$247 |
| Propane Estimated Cost |
$599 |
*Based on U.S. DOE test procedures. Costs based on CA$1.40 per therm NG and CA$3.09 per gallon propane.
Temperature Rise
| Temp Rise |
NPE-180S2 Flow |
| 19.4°C (35°F) |
31.8 l/m (8.4 GPM) |
| 22.2°C (40°F) |
28 l/m (7.4 GPM) |
| 25°C (45°F) |
24.6 l/m (6.5 GPM) |
| 27.8°C (50°F) |
22.3 l/m (5.9 GPM) |
| 30.6°C (55°F) |
20.1 l/m (5.3 GPM) |
| 33.3°C (60°F) |
18.5 l/m (4.9 GPM) |
| 36.1°C (65°F) |
17 l/m (4.5 GPM) |
| 38.9°C (70°F) |
15.9 l/m (4.2 GPM) |
| 41.7°C (75°F) |
14.8 l/m (3.9 GPM) |
| 44.4°C (80°F) |
14 l/m (3.7 GPM) |
| 47.2°C (85°F) |
13.2 l/m (3.5 GPM) |
| 50°C (90°F) |
12.5 l/m (3.3 GPM) |
| 55.6°C (100°F) |
11 l/m (2.9 GPM) |
| 61.1°C (110°F) |
10.2 l/m (2.7 GPM) |
| 66.7°C (120°F) |
9.5 l/m (2.5 GPM) |
| 72.2°C (130°F) |
8.7 l/m (2.3 GPM) |
| 77.8°C (140°F) |
7.9 l/m (2.1 GPM) |
DHW Capacity
| Natural gas |
10,000 – 150,000 BTU/h |
| Propane |
10,000 – 150,000 BTU/h |
Operating Cost Comparison
| System |
Usage |
Annual Cost |
| Navien Tankless |
177.0 therms |
$247 |
| Other Tankless |
228 therms |
$319 |
| 189 Liter Tank |
293 therms |
$409 |
Specifications
| Heat Capacity (NG) |
10,000 – 150,000 BTU/h |
| Heat Capacity (LP) |
10,000 – 150,000 BTU/h |
| UEF |
0.96 |
| Flow Rate 19°C Rise |
31.8 l/m (8.4 GPM) |
| Flow Rate 25°C Rise |
24.6 l/m (6.5 GPM) |
| Flow Rate 37°C Rise |
16.3 l/m (4.3 GPM) |
| Dimensions |
43.9cm W x 69.6cm H x 33.5cm D |
| Weight |
30.8 kg (68 lbs) |
| Installation |
Indoor or outdoor wall-hung |
| Venting |
Forced draft direct-vent |
| Ignition |
Electronic ignition |
| Water Pressure |
1.05-10.55 kg/cm² (15-150 PSI) |
| NG Supply Pressure |
3.5 WC to 10.5 WC |
| LP Supply Pressure |
8 WC to 13 WC |
| NG Manifold Pressure |
-0.03 WC to -0.55 WC |
| LP Manifold Pressure |
-0.02 WC to -0.55 WC |
| Minimum Flow Rate |
1.9 l/m (0.5 GPM) |
| Cold Water Inlet |
3/4″ NPT |
| Hot Water Outlet |
3/4″ NPT |
| Gas Inlet |
3/4″ NPT |
| Power Supply |
120V AC, 60 Hz |
| Max Power |
200 W, 350 W w/ external pump |
| Materials |
Cold rolled carbon steel casing; stainless steel primary & secondary heat exchangers |
| Venting Options |
PVC, CPVC, polypropylene, stainless steel, 2 or 3 inch |
| Vent Clearances |
0 to combustibles |
| High Elevation Rating |
Up to 10,100 ft |
| Safety Devices |
Flame rod, APS, ignition detector, temperature high limit switches, exhaust temp sensor, power surge fuse, burner limit fuse, VID |
Navien reserves the right to change specifications at any time without notice.
