WattCost

Data through April 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 $238 at the U.S. average electricity rate, or $19.85 a month. Efficiency-wise it's unremarkable in a good way: within 17% of the median certified electric water heater (rank 402 of 566). Where you live moves the bill from $156 a year in North Dakota to $590 in Hawaii.

Estimated annual running cost · U.S. average rate 18.8¢/kWh

$238/yr

$121 · cheapest certified water heaters (electric)$328 · priciest
Per month
$19.85
Per day
65¢
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
643 kWh1,741 kWh
Where the Navien NWP500S080AUMB (▮) sits among all 566 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
Alabama17.4¢$220
Alaska27.4¢$346
Arizona15.5¢$196
Arkansas14.2¢$179
California35.3¢$446
Colorado16.5¢$209
Connecticut32.2¢$408
Delaware18.8¢$238
District of Columbia25.4¢$321
Florida15.4¢$195
Georgia15.4¢$194
Hawaiipriciest46.6¢$590
Idaho12.7¢$161
Illinois20.5¢$259
Indiana17.9¢$226
Iowa13.9¢$175
Kansas15.8¢$200
Kentucky15.0¢$190
Louisiana14.4¢$183
Maine28.4¢$360
Maryland22.1¢$279
Massachusetts29.4¢$373
Michigan21.4¢$271
Minnesota16.4¢$207
Mississippi16.8¢$212
Missouri14.0¢$177
Montana13.9¢$176
Nebraska13.3¢$168
Nevada14.3¢$181
New Hampshire27.2¢$345
New Jersey23.5¢$298
New Mexico15.2¢$192
New York29.4¢$373
North Carolina16.3¢$206
North Dakotacheapest12.3¢$156
Ohio19.5¢$247
Oklahoma13.3¢$168
Oregon15.8¢$200
Pennsylvania21.5¢$272
Rhode Island28.3¢$358
South Carolina17.1¢$216
South Dakota14.5¢$184
Tennessee14.9¢$189
Texas17.0¢$215
Utah13.3¢$168
Vermont24.6¢$311
Virginia17.4¢$220
Washington14.4¢$182
West Virginia16.1¢$203
Wisconsin19.2¢$243
Wyoming14.7¢$186

Certified models closest in efficiency

electric water heaters within reach of 1,265 kWh/yr
ModelkWh/yr$/yr (US avg)
LG APHWC501D1,262$238
LG APHWC501L1,262$238
LG APHWC501M1,262$238
LG APHWC801D1,272$240
LG APHWC801L1,272$240
LG APHWC801M1,272$240

Run your own numbers

Your rate, your numbers

Per day
65¢
Per month
$19.85
Per year
$238

1,265 kWh/yr × 18.8¢/kWh = $238/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 $19.85 a month at the U.S. average residential rate (18.8¢/kWh) — 65¢ a day, or $238 a year. Your state's rate moves this up or down; see the table above.
Is the Navien NWP500S080AUMB energy efficient?
It uses 17% 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 $156 a year in North Dakota (12.3¢/kWh) and $590 in Hawaii (46.6¢/kWh).

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