Appliances / Heat pump water heaters / Navien
Navien NWP500S080AUMB
74 gal · 240-volt integrated heat pump water heater
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- Price. Check what it costs at the store.
- Plus running cost. Add $2,991 of electricity over 13 years. That is the part the price tag hides.
- Compare. Pick your state below, then check the cheaper-to-run models of the same size.
About the Navien NWP500S080AUMB
The Navien NWP500S080AUMB is a 74 gal 240-volt integrated heat pump water heater certified by ENERGY STAR. Its official test figure is 1,265 kWh of electricity a year, which at the U.S. average price of 18.19¢ per kWh comes to $230 a year, or $2,991 over a typical 13-year life.
For the same hot water, a standard electric tank water heater would use about 5,569 kWh a year, so this model uses 77% less electricity and saves about $783 a year.
Among 371 240-volt integrated models it ranks #284 for running cost. The cheapest model of this type would save $1,471 in electricity over 13 years, though it may differ in size and features.
If you want the same type and a similar size for less to run, the Friedrich PROH80 T2 FD400-15 uses 871 kWh a year and would save about $932 over 13 years.
Cost to run where you live
1,265 kWh a year (ENERGY STAR test figure) × 18.19¢ per kWh, the average residential price in the U.S. for Jan–Aug 2026 (EIA). Your bill depends on your utility and how you use it.
Cheaper to run, same type and size
Or see every 66 gallons and up model ranked.
| Friedrich PROH80 T2 FD400-15 | 72 gal | $158/yr | saves $932 |
| Rheem PROPH80 T2 RH375-15 | 72 gal | $158/yr | saves $932 |
| Rheem PROPH80 T2 RH400-15 | 72 gal | $158/yr | saves $932 |
| Rheem XE80T10H22U0 | 72 gal | $158/yr | saves $932 |
Specs
| Brand | Navien |
| Model | NWP500S080AUMB |
| Type | 240-volt integrated |
| Energy use | 1265 kWh / year |
| Federal maximum for this type | 5569 kWh / year |
| Size | 74 gal |
| Width | 25 in |
| Tank size | 74 gal |
| First-hour rating | 85 gal |
| Efficiency (UEF) | 4.05 |
| Usage pattern | High-Usage |
| Voltage | 240 |
| Tank height | 71.6 in |
| Tank diameter | 25 in |
Specs and energy use from the ENERGY STAR certified products list (U.S. EPA). An asterisk in a model number stands for colour or finish codes. HouseholdLeak is not affiliated with ENERGY STAR or the EPA.
Questions people ask
How much does the Navien NWP500S080AUMB cost to run?
About $230 a year at the U.S. average electricity price (18.19¢/kWh), based on its ENERGY STAR rating of 1,265 kWh a year. In a state with expensive power it can be much more; pick your state on this page to see your number.
How much will the Navien NWP500S080AUMB cost in electricity over its life?
About $2,991 over 13 years, a typical life for a heat pump water heater. Add that to the price you pay to get the true cost to own.
Is the Navien NWP500S080AUMB energy efficient?
Yes. It is ENERGY STAR certified and uses 77% less electricity than a standard electric tank water heater.
Is there a cheaper water heater to run of the same type and size?
Yes. The Friedrich PROH80 T2 FD400-15 uses 871 kWh a year, about $932 less in electricity over 13 years.
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