Navien NWP500S080AUMB

ENERGY STAR certified

Heat pump water heater · 74 gallons

InYour statethis water heater costs

about $19 a month

$228 a year

An estimate at your state's average rate — not a guarantee of your bill.

Estimated yearly cost

$177

a year

The yellow sticker says $177 a year.

You'll pay $51 more.

Sticker uses 14¢ per kWh. The U.S. average is 18.0¢ per kWh.

Energy use

1,265 kWh a year

vs similar heat pump water heater

+13%

Cheaper water heaters, same size

Cheaper to run, same size

A year at the U.S. average residential rate.

Compare all 161 water heaters over 70 gallons

Cost in every state

1,265 kWh a year × each state's average residential rate (EIA 12-month average through July 2026).

State	Rate	Per year	Per month
Hawaii	43.7¢	$553	about $46 a month
California	33.1¢	$419	about $35 a month
Massachusetts	30.4¢	$384	about $32 a month
Rhode Island	29.4¢	$372	about $31 a month
Maine	29.3¢	$370	about $31 a month
New York	28.4¢	$359	about $30 a month
Connecticut	28.2¢	$357	about $30 a month
Alaska	27.0¢	$342	about $28 a month
New Hampshire	26.8¢	$339	about $28 a month
District of Columbia	24.2¢	$306	about $26 a month

Show all 52 states

Vermont	23.9¢	$302	about $25 a month
New Jersey	23.6¢	$299	about $25 a month
Maryland	22.3¢	$282	about $24 a month
Michigan	21.0¢	$266	about $22 a month
Pennsylvania	20.8¢	$262	about $22 a month
Illinois	19.0¢	$240	about $20 a month
Wisconsin	18.8¢	$237	about $20 a month
Ohio	18.3¢	$231	about $19 a month
U.S. average	18.0¢	$228	about $19 a month
Delaware	18.0¢	$227	about $19 a month
Indiana	17.1¢	$216	about $18 a month
Virginia	16.6¢	$209	about $17 a month
Colorado	16.6¢	$209	about $17 a month
Alabama	16.5¢	$209	about $17 a month
Minnesota	16.2¢	$205	about $17 a month
Texas	16.0¢	$202	about $17 a month
South Carolina	15.7¢	$199	about $17 a month
West Virginia	15.7¢	$198	about $17 a month
Oregon	15.6¢	$197	about $16 a month
Arizona	15.5¢	$196	about $16 a month
Florida	15.4¢	$195	about $16 a month
New Mexico	15.2¢	$193	about $16 a month
Kansas	15.1¢	$191	about $16 a month
Georgia	15.1¢	$191	about $16 a month
Mississippi	14.9¢	$189	about $16 a month
North Carolina	14.9¢	$188	about $16 a month
South Dakota	14.3¢	$181	about $15 a month
Washington	14.2¢	$179	about $15 a month
Wyoming	14.2¢	$179	about $15 a month
Iowa	14.1¢	$178	about $15 a month
Kentucky	14.0¢	$177	about $15 a month
Montana	13.9¢	$176	about $15 a month
Missouri	13.9¢	$176	about $15 a month
Tennessee	13.7¢	$173	about $14 a month
Oklahoma	13.6¢	$172	about $14 a month
Nevada	13.6¢	$172	about $14 a month
Arkansas	13.5¢	$170	about $14 a month
Utah	13.3¢	$168	about $14 a month
Louisiana	13.1¢	$165	about $14 a month
Nebraska	12.9¢	$163	about $14 a month
Idaho	12.7¢	$160	about $13 a month
North Dakota	12.5¢	$159	about $13 a month

What the Navien NWP500S080AUMB costs where electricity is expensive

At Hawaii's average residential rate of 43.7¢ per kWh, the Navien NWP500S080AUMB costs $553 a year — $376 more a year than the label says. The EnergyGuide label estimates $177 a year, because every label in the country is calculated at 14¢ per kWh. At the U.S. average of 18.0¢ per kWh this water heater costs $228 a year, and in North Dakota, the cheapest state, $159 a year.

Estimated annual running cost for the Navien NWP500S080AUMB in the highest-rate states and the lowest-rate state
Where	Rate	Cost a year	vs the label
Hawaii	43.7¢ per kWh	$553	+$376
California	33.1¢ per kWh	$419	+$242
Massachusetts	30.4¢ per kWh	$384	+$207
Rhode Island	29.4¢ per kWh	$372	+$195
Maine	29.3¢ per kWh	$370	+$193
North Dakota	12.5¢ per kWh	$159	−$19

Electricity prices: EIA 12-month average through July 2026, residential sector, average revenue per kWh. Label figure calculated at 14¢ per kWh, the rate the FTC requires on labels.

Full specs

At the U.S. average residential rate this one costs $228 a year — about 13% more expensive to run than the average heat pump water heater ($203 a year across 510 certified models).

$228

Most efficient $123Average $203Least efficient $314

Every model on this scale is ENERGY STAR certified. Range across 510 heat pump water heaters, priced a year at the U.S. average residential rate.

Brand: Navien
Model number: NWP500S080AUMB
Model name: NWP500
Type: Heat pump water heater
Capacity: 74 gallons
Annual energy use: 1,265 kWh a year
Combined Energy Factor (CEF): 4.05
ENERGY STAR Most Efficient: No
On the market since: April 2025
Certified: April 2025
Tank volume (gallons): 74
First-hour rating (gallons): 85
Uniform Energy Factor (UEF): 4.05
Draw pattern: High-Usage
Heat pump type: 240 Volt Integrated HPWH
Recovery efficiency (%): 453.00
Tank height (in): 71.6
Tank diameter (in): 25

Where to buy

We do not sell appliances. These open a search on the retailer's own site.

Search Amazon Search Home Depot Search Lowe's Search Best Buy

Common questions

+How much does the Navien NWP500S080AUMB cost to run per month?

about $19 a month at the U.S. average residential rate of 18.0¢ per kWh, or $228 a year. Your cost depends on your state's rate — see the table above.

+How many kWh does the Navien NWP500S080AUMB use?

1,265 kWh a year, as the manufacturer filed it with the EPA, in the ENERGY STAR certified product database.

+Is the Navien NWP500S080AUMB energy efficient?

It is listed as ENERGY STAR certified. It uses about 13% more electricity than the average heat pump water heater (average: 1,123 kWh a year).

+How does the Navien NWP500S080AUMB compare to the average water heater?

The average heat pump water heater in our database uses 1,123 kWh a year, costing $203 a year at the U.S. average residential rate. The Navien NWP500S080AUMB uses 1,265 kWh a year, costing $228 a year.

How we calculate this

Annual energy use (1,265 kWh a year) is the figure the manufacturer filed for this model with the EPA, in the ENERGY STAR certified product database. Running cost is that figure multiplied by a state's average residential electricity price from the U.S. Energy Information Administration (12-month average through July 2026, average revenue per kWh).

The annual figure for a water heater assumes a hot water draw of 10, 38, 55 or 84 gallons a day, set by the heater's first-hour rating, per the DOE test procedure (10 CFR 430 Subpart B, Appendix E). Full methodology.

Sources: EPA ENERGY STAR certified product data, updated weekly · U.S. EIA electricity prices, 12-month average through July 2026.