WattCost

Data through April 2026

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

Rheem XE40T10H22U1

For a standard household draw pattern, the Rheem XE40T10H22U1 uses a certified 643 kWh per year: roughly $121 annually at the national average rate. That puts it in the most efficient tenth of every certified electric water heater — 41% less electricity than the median, ranked 5 of 566. The same unit costs $79 a year in North Dakota but $300 in Hawaii — electricity rates, not the appliance, make the difference.

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

$121/yr

$121 · cheapest certified water heaters (electric)$328 · priciest
Per month
$10.09
Per day
33¢
Certified use
643 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
240 Volt Integrated HPWH
Storage volume
36 gal
First-hour rating
46 gal
UEF
3.45
643 kWh1,741 kWh
Where the Rheem XE40T10H22U1 (▮) sits among all 566 certified water heaters (electric), by annual kWh

What it costs in every state

Rheem XE40T10H22U1: 643 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama17.4¢$112
Alaska27.4¢$176
Arizona15.5¢$100
Arkansas14.2¢$91
California35.3¢$227
Colorado16.5¢$106
Connecticut32.2¢$207
Delaware18.8¢$121
District of Columbia25.4¢$163
Florida15.4¢$99
Georgia15.4¢$99
Hawaiipriciest46.6¢$300
Idaho12.7¢$82
Illinois20.5¢$132
Indiana17.9¢$115
Iowa13.9¢$89
Kansas15.8¢$101
Kentucky15.0¢$97
Louisiana14.4¢$93
Maine28.4¢$183
Maryland22.1¢$142
Massachusetts29.4¢$189
Michigan21.4¢$138
Minnesota16.4¢$105
Mississippi16.8¢$108
Missouri14.0¢$90
Montana13.9¢$89
Nebraska13.3¢$85
Nevada14.3¢$92
New Hampshire27.2¢$175
New Jersey23.5¢$151
New Mexico15.2¢$97
New York29.4¢$189
North Carolina16.3¢$104
North Dakotacheapest12.3¢$79
Ohio19.5¢$125
Oklahoma13.3¢$86
Oregon15.8¢$101
Pennsylvania21.5¢$138
Rhode Island28.3¢$182
South Carolina17.1¢$110
South Dakota14.5¢$93
Tennessee14.9¢$96
Texas17.0¢$109
Utah13.3¢$85
Vermont24.6¢$158
Virginia17.4¢$112
Washington14.4¢$92
West Virginia16.1¢$103
Wisconsin19.2¢$124
Wyoming14.7¢$94

Certified models closest in efficiency

electric water heaters within reach of 643 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich PROH40 T2 FD400-15643$121
Rheem PROPH40 T2 RH375-15643$121
Rheem PROPH40 T2 RH400-15643$121
Rheem XE40T10H22U0643$121
Richmond 10E40-HP515643$121
Richmond 10E40-HP5U15643$121

Run your own numbers

Your rate, your numbers

Per day
33¢
Per month
$10.09
Per year
$121

643 kWh/yr × 18.8¢/kWh = $121/yr

Prefilled with this model's certified 643 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 XE40T10H22U1 use?
ENERGY STAR certifies the Rheem XE40T10H22U1 at 643 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 XE40T10H22U1 cost to run per month?
About $10.09 a month at the U.S. average residential rate (18.8¢/kWh) — 33¢ a day, or $121 a year. Your state's rate moves this up or down; see the table above.
Is the Rheem XE40T10H22U1 energy efficient?
It uses 41% less electricity than the median certified electric water heater, placing it in the top 10% of certified models.
What does the Rheem XE40T10H22U1 cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $79 a year in North Dakota (12.3¢/kWh) and $300 in Hawaii (46.6¢/kWh).

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