WattCost

Data through June 2026

Running cost · Water Heaters (Electric) · ENERGY STAR certified

Navien NWP500S080AUMB

Heating a typical household's hot water, the Navien NWP500S080AUMB is certified at 1,265 kWh a year — about $232 at the U.S. average electricity rate, or $19.33 a month. Efficiency-wise it's unremarkable in a good way: within 5% of the median certified electric water heater (rank 340 of 510). Where you live moves the bill from $166 a year in Nevada to $667 in Hawaii.

Dimensions 71.6" H × 25" W

Estimated annual running cost · U.S. average rate 18.3¢/kWh

$232/yr

$125 · cheapest certified water heaters (electric)$319 · priciest
Per month
$19.33
Per day
64¢
Certified use
1,265 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
240 Volt Integrated HPWH
Storage volume
74 gal
First-hour rating
85 gal
UEF
4.05
681 kWh1,741 kWh
Where the Navien NWP500S080AUMB (▮) sits among all 510 certified water heaters (electric), by annual kWh

What it costs in every state

Navien NWP500S080AUMB: 1,265 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$207
Alaska28.2¢$357
Arizona15.2¢$192
Arkansas14.1¢$179
California34.7¢$439
Colorado17.1¢$217
Connecticut24.3¢$308
Delaware19.3¢$244
District of Columbia24.4¢$309
Florida15.1¢$191
Georgia16.4¢$207
Hawaiipriciest52.7¢$667
Idaho14.4¢$182
Illinois19.9¢$252
Indiana17.5¢$222
Iowa15.9¢$202
Kansas15.7¢$199
Kentucky14.3¢$180
Louisiana13.5¢$171
Maine29.6¢$374
Maryland21.8¢$276
Massachusetts29.6¢$375
Michigan23.0¢$291
Minnesota17.5¢$222
Mississippi14.9¢$188
Missouri16.2¢$205
Montana15.1¢$192
Nebraska13.3¢$168
Nevadacheapest13.1¢$166
New Hampshire27.0¢$342
New Jersey24.9¢$316
New Mexico15.1¢$191
New York29.5¢$373
North Carolina14.7¢$186
North Dakota14.1¢$179
Ohio19.2¢$243
Oklahoma14.3¢$181
Oregon16.3¢$206
Pennsylvania21.7¢$275
Rhode Island29.2¢$370
South Carolina15.6¢$197
South Dakota15.4¢$194
Tennessee14.1¢$178
Texas15.9¢$202
Utah13.4¢$169
Vermont24.4¢$309
Virginia17.2¢$218
Washington14.9¢$189
West Virginia15.4¢$195
Wisconsin19.6¢$247
Wyoming15.2¢$193

Certified models closest in efficiency

electric water heaters within reach of 1,265 kWh/yr
ModelkWh/yr$/yr (US avg)
LG APHWC501D1,262$231
LG APHWC501L1,262$231
LG APHWC501M1,262$231
LG APHWC801D1,272$233
LG APHWC801L1,272$233
LG APHWC801M1,272$233

Run your own numbers

Your rate, your numbers

Per day
64¢
Per month
$19.33
Per year
$232

1,265 kWh/yr × 18.3¢/kWh = $232/yr

Prefilled with this model's certified 1,265 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh comes from the DOE Uniform Energy Factor test, which simulates a typical household's daily hot-water draw pattern. Only electric models (including heat-pump units) are listed — gas models burn gas, not kWh.

Questions, answered with the data

How much electricity does the Navien NWP500S080AUMB use?
ENERGY STAR certifies the Navien NWP500S080AUMB at 1,265 kWh per year. The certified annual kWh comes from the DOE Uniform Energy Factor test, which simulates a typical household's daily hot-water draw pattern. Only electric models (including heat-pump units) are listed — gas models burn gas, not kWh.
How much does the Navien NWP500S080AUMB cost to run per month?
About $19.33 a month at the U.S. average residential rate (18.3¢/kWh) — 64¢ a day, or $232 a year. Your state's rate moves this up or down; see the table above.
Is the Navien NWP500S080AUMB energy efficient?
It uses 5% more electricity than the median certified electric water heater.
What does the Navien NWP500S080AUMB cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $166 a year in Nevada (13.1¢/kWh) and $667 in Hawaii (52.7¢/kWh).

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