WattCost

Data through June 2026

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

Rheem XE40T10HM00U0

For a standard household draw pattern, the Rheem XE40T10HM00U0 uses a certified 780 kWh per year: roughly $143 annually at the national average rate. Only a handful of certified electric water heaters do better: it ranks 9 of 510 and undercuts the median by 36%. The same unit costs $102 a year in Nevada but $411 in Hawaii — electricity rates, not the appliance, make the difference.

Dimensions 62.3" H × 20.3" W

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

$143/yr

$125 · cheapest certified water heaters (electric)$319 · priciest
Per month
$11.92
Per day
39¢
Certified use
780 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
120 Volt Integrated HPWH
Storage volume
36 gal
First-hour rating
45 gal
UEF
2.8
681 kWh1,741 kWh
Where the Rheem XE40T10HM00U0 (▮) sits among all 510 certified water heaters (electric), by annual kWh

What it costs in every state

Rheem XE40T10HM00U0: 780 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$128
Alaska28.2¢$220
Arizona15.2¢$118
Arkansas14.1¢$110
California34.7¢$271
Colorado17.1¢$134
Connecticut24.3¢$190
Delaware19.3¢$150
District of Columbia24.4¢$190
Florida15.1¢$118
Georgia16.4¢$128
Hawaiipriciest52.7¢$411
Idaho14.4¢$112
Illinois19.9¢$155
Indiana17.5¢$137
Iowa15.9¢$124
Kansas15.7¢$123
Kentucky14.3¢$111
Louisiana13.5¢$105
Maine29.6¢$231
Maryland21.8¢$170
Massachusetts29.6¢$231
Michigan23.0¢$179
Minnesota17.5¢$137
Mississippi14.9¢$116
Missouri16.2¢$127
Montana15.1¢$118
Nebraska13.3¢$103
Nevadacheapest13.1¢$102
New Hampshire27.0¢$211
New Jersey24.9¢$195
New Mexico15.1¢$117
New York29.5¢$230
North Carolina14.7¢$115
North Dakota14.1¢$110
Ohio19.2¢$150
Oklahoma14.3¢$112
Oregon16.3¢$127
Pennsylvania21.7¢$169
Rhode Island29.2¢$228
South Carolina15.6¢$121
South Dakota15.4¢$120
Tennessee14.1¢$110
Texas15.9¢$124
Utah13.4¢$104
Vermont24.4¢$191
Virginia17.2¢$134
Washington14.9¢$116
West Virginia15.4¢$121
Wisconsin19.6¢$153
Wyoming15.2¢$119

Certified models closest in efficiency

electric water heaters within reach of 780 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich PROH40 T0 FD120-M780$143
Friedrich PROH40 T0 FD120-MSO780$143
Rheem PROPH40 T0 RH120-M780$143
Rheem PROPH40 T0 RH120-MSO780$143
Rheem XE40T10HMS00U0780$143
Richmond 10E40-HP120M780$143

Run your own numbers

Your rate, your numbers

Per day
39¢
Per month
$11.92
Per year
$143

780 kWh/yr × 18.3¢/kWh = $143/yr

Prefilled with this model's certified 780 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 XE40T10HM00U0 use?
ENERGY STAR certifies the Rheem XE40T10HM00U0 at 780 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 XE40T10HM00U0 cost to run per month?
About $11.92 a month at the U.S. average residential rate (18.3¢/kWh) — 39¢ a day, or $143 a year. Your state's rate moves this up or down; see the table above.
Is the Rheem XE40T10HM00U0 energy efficient?
It uses 36% less electricity than the median certified electric water heater, placing it in the top 10% of certified models.
What does the Rheem XE40T10HM00U0 cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $102 a year in Nevada (13.1¢/kWh) and $411 in Hawaii (52.7¢/kWh).

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