WattCost

Data through April 2026

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

Richmond 10E40-HP515

For a standard household draw pattern, the Richmond 10E40-HP515 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 6 of 566. Where you live moves the bill from $79 a year in North Dakota to $300 in Hawaii.

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 Richmond 10E40-HP515 (▮) sits among all 566 certified water heaters (electric), by annual kWh

What it costs in every state

Richmond 10E40-HP515: 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
Rheem XE40T10H22U1643$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 Richmond 10E40-HP515 use?
ENERGY STAR certifies the Richmond 10E40-HP515 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 Richmond 10E40-HP515 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 Richmond 10E40-HP515 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 Richmond 10E40-HP515 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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