WattCost

Data through June 2026

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

Rheem PRO H65 T2 RH310UM

For a standard household draw pattern, the Rheem PRO H65 T2 RH310UM uses a certified 900 kWh per year: roughly $165 annually at the national average rate. Compared with the median certified electric water heater, it uses 26% less electricity — rank 107 out of 510. The same unit costs $118 a year in Nevada but $474 in Hawaii — electricity rates, not the appliance, make the difference.

Dimensions 64.2" H × 24.3" W

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

$165/yr

$125 · cheapest certified water heaters (electric)$319 · priciest
Per month
$13.76
Per day
45¢
Certified use
900 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
240 Volt Integrated HPWH
Storage volume
59 gal
First-hour rating
75 gal
UEF
3.5
681 kWh1,741 kWh
Where the Rheem PRO H65 T2 RH310UM (▮) sits among all 510 certified water heaters (electric), by annual kWh

What it costs in every state

Rheem PRO H65 T2 RH310UM: 900 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$148
Alaska28.2¢$254
Arizona15.2¢$137
Arkansas14.1¢$127
California34.7¢$313
Colorado17.1¢$154
Connecticut24.3¢$219
Delaware19.3¢$174
District of Columbia24.4¢$220
Florida15.1¢$136
Georgia16.4¢$147
Hawaiipriciest52.7¢$474
Idaho14.4¢$129
Illinois19.9¢$179
Indiana17.5¢$158
Iowa15.9¢$143
Kansas15.7¢$141
Kentucky14.3¢$128
Louisiana13.5¢$121
Maine29.6¢$266
Maryland21.8¢$197
Massachusetts29.6¢$266
Michigan23.0¢$207
Minnesota17.5¢$158
Mississippi14.9¢$134
Missouri16.2¢$146
Montana15.1¢$136
Nebraska13.3¢$119
Nevadacheapest13.1¢$118
New Hampshire27.0¢$243
New Jersey24.9¢$225
New Mexico15.1¢$136
New York29.5¢$265
North Carolina14.7¢$133
North Dakota14.1¢$127
Ohio19.2¢$173
Oklahoma14.3¢$129
Oregon16.3¢$147
Pennsylvania21.7¢$196
Rhode Island29.2¢$263
South Carolina15.6¢$140
South Dakota15.4¢$138
Tennessee14.1¢$127
Texas15.9¢$143
Utah13.4¢$120
Vermont24.4¢$220
Virginia17.2¢$155
Washington14.9¢$134
West Virginia15.4¢$139
Wisconsin19.6¢$176
Wyoming15.2¢$137

Certified models closest in efficiency

electric water heaters within reach of 900 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich PROH65 T2 FD310BM900$165
Friedrich PROH65 T2 FD310UM900$165
Friedrich PROH65 T2 FD350BM900$165
Friedrich PROH65 T2 FD350UM900$165
Rheem PRO H65 T2 RH310BM900$165
Rheem PROUH65 T2 RH350BM900$165

Run your own numbers

Your rate, your numbers

Per day
45¢
Per month
$13.76
Per year
$165

900 kWh/yr × 18.3¢/kWh = $165/yr

Prefilled with this model's certified 900 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 PRO H65 T2 RH310UM use?
ENERGY STAR certifies the Rheem PRO H65 T2 RH310UM at 900 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 PRO H65 T2 RH310UM cost to run per month?
About $13.76 a month at the U.S. average residential rate (18.3¢/kWh) — 45¢ a day, or $165 a year. Your state's rate moves this up or down; see the table above.
Is the Rheem PRO H65 T2 RH310UM energy efficient?
It uses 26% less electricity than the median certified electric water heater, placing it in the efficient third of certified models.
What does the Rheem PRO H65 T2 RH310UM cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $118 a year in Nevada (13.1¢/kWh) and $474 in Hawaii (52.7¢/kWh).

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