WattCost

Data through April 2026

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

Rheem XE40T10H45U0

For a standard household draw pattern, the Rheem XE40T10H45U0 uses a certified 859 kWh per year: roughly $162 annually at the national average rate. Compared with the median certified electric water heater, it uses 21% less electricity — rank 94 out of 566. The same unit costs $106 a year in North Dakota but $400 in Hawaii — electricity rates, not the appliance, make the difference.

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

$162/yr

$121 · cheapest certified water heaters (electric)$328 · priciest
Per month
$13.48
Per day
44¢
Certified use
859 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
240 Volt Integrated HPWH
Storage volume
36 gal
First-hour rating
60 gal
UEF
3.83
643 kWh1,741 kWh
Where the Rheem XE40T10H45U0 (▮) sits among all 566 certified water heaters (electric), by annual kWh

What it costs in every state

Rheem XE40T10H45U0: 859 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama17.4¢$150
Alaska27.4¢$235
Arizona15.5¢$133
Arkansas14.2¢$122
California35.3¢$303
Colorado16.5¢$142
Connecticut32.2¢$277
Delaware18.8¢$161
District of Columbia25.4¢$218
Florida15.4¢$132
Georgia15.4¢$132
Hawaiipriciest46.6¢$400
Idaho12.7¢$109
Illinois20.5¢$176
Indiana17.9¢$154
Iowa13.9¢$119
Kansas15.8¢$136
Kentucky15.0¢$129
Louisiana14.4¢$124
Maine28.4¢$244
Maryland22.1¢$190
Massachusetts29.4¢$253
Michigan21.4¢$184
Minnesota16.4¢$141
Mississippi16.8¢$144
Missouri14.0¢$120
Montana13.9¢$119
Nebraska13.3¢$114
Nevada14.3¢$123
New Hampshire27.2¢$234
New Jersey23.5¢$202
New Mexico15.2¢$130
New York29.4¢$253
North Carolina16.3¢$140
North Dakotacheapest12.3¢$106
Ohio19.5¢$167
Oklahoma13.3¢$114
Oregon15.8¢$136
Pennsylvania21.5¢$184
Rhode Island28.3¢$243
South Carolina17.1¢$147
South Dakota14.5¢$125
Tennessee14.9¢$128
Texas17.0¢$146
Utah13.3¢$114
Vermont24.6¢$211
Virginia17.4¢$149
Washington14.4¢$123
West Virginia16.1¢$138
Wisconsin19.2¢$165
Wyoming14.7¢$126

Certified models closest in efficiency

electric water heaters within reach of 859 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich PROH40 T2 FD400-30859$162
Friedrich PROH40 T2 FD400-SO859$162
Rheem PROPH40 T2 RH375-30859$162
Rheem PROPH40 T2 RH375-SO859$162
Rheem PROPH40 T2 RH400-30859$162
Rheem PROPH40 T2 RH400-SO859$162

Run your own numbers

Your rate, your numbers

Per day
44¢
Per month
$13.48
Per year
$162

859 kWh/yr × 18.8¢/kWh = $162/yr

Prefilled with this model's certified 859 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 Rheem XE40T10H45U0 use?
ENERGY STAR certifies the Rheem XE40T10H45U0 at 859 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 Rheem XE40T10H45U0 cost to run per month?
About $13.48 a month at the U.S. average residential rate (18.8¢/kWh) — 44¢ a day, or $162 a year. Your state's rate moves this up or down; see the table above.
Is the Rheem XE40T10H45U0 energy efficient?
It uses 21% less electricity than the median certified electric water heater, placing it in the efficient third of certified models.
What does the Rheem XE40T10H45U0 cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $106 a year in North Dakota (12.3¢/kWh) and $400 in Hawaii (46.6¢/kWh).

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