AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-50) vs Navien NWP500 65-Gallon
The Navien NWP500 65-Gallon is the more efficient unit: UEF 4.03 versus 3.75 — about 7% less energy for the same hot water. At national average rates that works out to about $147/year for the AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-50) against $212/year for the Navien NWP500 65-Gallon — a $65 annual difference. The Navien NWP500 65-Gallon delivers more hot water in the peak hour (80 gal first-hour rating vs 68 gal). Only the AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-50) is connected-capable (app control, utility programs).
| AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-50) | Navien NWP500 65-Gallon | |
|---|---|---|
| Uniform Energy Factor (UEF) | 3.75 | 4.03 |
| Fuel | Electric | Electric |
| First-hour rating | 68 gal | 80 gal |
| Rated storage volume | 45 gal | 61 gal |
| Draw pattern | Medium | High |
| Annual electricity use | 867 kWh/yr | 1245 kWh/yr |
| Heat pump type | 240 Volt Integrated HPWH | 240 Volt Integrated HPWH |
| Input voltage | 240 | 240 |
| Max current draw | 21 A | 23 A |
| Recovery efficiency | 430 % | 433 % |
| Smart / connected capable | Yes | No |
| Refrigerant (GWP) | R-134a (GWP:1430) | R-134a (GWP:1430) |
| Compressor low-temp cutoff | 35 °F | 41 °F |
| Height | 45.8 in | 63 in |
| Diameter | 18.2 in | 25 in |
| ENERGY STAR certified | Yes | Yes |
Frequently asked questions
Which costs less to run, the AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-50) or the Navien NWP500 65-Gallon?
The AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-50): about $147/year versus $212/year for the Navien NWP500 65-Gallon at national average rates — a $65 annual difference.
Are the AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-50) and Navien NWP500 65-Gallon both ENERGY STAR certified?
Yes — every water heater in this database is drawn from the U.S. EPA ENERGY STAR certified water heater datasets.