WattCost

Data through June 2026

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

Ruud PROUH50 T0 RU120-MSO

Heating a typical household's hot water, the Ruud PROUH50 T0 RU120-MSO is certified at 1,072 kWh a year — about $197 at the U.S. average electricity rate, or $16.38 a month. Efficiency-wise it's unremarkable in a good way: within 11% of the median certified electric water heater (rank 233 of 510). Where you live moves the bill from $141 a year in Nevada to $565 in Hawaii.

Dimensions 61.8" H × 22.3" W

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

$197/yr

$125 · cheapest certified water heaters (electric)$319 · priciest
Per month
$16.38
Per day
54¢
Certified use
1,072 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
120 Volt Integrated HPWH
Storage volume
46 gal
First-hour rating
55 gal
UEF
3
681 kWh1,741 kWh
Where the Ruud PROUH50 T0 RU120-MSO (▮) sits among all 510 certified water heaters (electric), by annual kWh

What it costs in every state

Ruud PROUH50 T0 RU120-MSO: 1,072 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$176
Alaska28.2¢$302
Arizona15.2¢$163
Arkansas14.1¢$151
California34.7¢$372
Colorado17.1¢$184
Connecticut24.3¢$261
Delaware19.3¢$207
District of Columbia24.4¢$261
Florida15.1¢$162
Georgia16.4¢$175
Hawaiipriciest52.7¢$565
Idaho14.4¢$154
Illinois19.9¢$213
Indiana17.5¢$188
Iowa15.9¢$171
Kansas15.7¢$168
Kentucky14.3¢$153
Louisiana13.5¢$145
Maine29.6¢$317
Maryland21.8¢$234
Massachusetts29.6¢$317
Michigan23.0¢$246
Minnesota17.5¢$188
Mississippi14.9¢$160
Missouri16.2¢$174
Montana15.1¢$162
Nebraska13.3¢$142
Nevadacheapest13.1¢$141
New Hampshire27.0¢$290
New Jersey24.9¢$267
New Mexico15.1¢$161
New York29.5¢$316
North Carolina14.7¢$158
North Dakota14.1¢$151
Ohio19.2¢$206
Oklahoma14.3¢$154
Oregon16.3¢$175
Pennsylvania21.7¢$233
Rhode Island29.2¢$313
South Carolina15.6¢$167
South Dakota15.4¢$165
Tennessee14.1¢$151
Texas15.9¢$171
Utah13.4¢$143
Vermont24.4¢$262
Virginia17.2¢$185
Washington14.9¢$160
West Virginia15.4¢$166
Wisconsin19.6¢$210
Wyoming15.2¢$163

Certified models closest in efficiency

electric water heaters within reach of 1,072 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich PROH50 T0 FD120-M1,072$197
Friedrich PROH50 T0 FD120-MSO1,072$197
Rheem PROPH50 T0 RH120-M1,072$197
Rheem PROPH50 T0 RH120-MSO1,072$197
Rheem XE50T10HM00U01,072$197
Rheem XE50T10HMS00U01,072$197

Run your own numbers

Your rate, your numbers

Per day
54¢
Per month
$16.38
Per year
$197

1,072 kWh/yr × 18.3¢/kWh = $197/yr

Prefilled with this model's certified 1,072 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 Ruud PROUH50 T0 RU120-MSO use?
ENERGY STAR certifies the Ruud PROUH50 T0 RU120-MSO at 1,072 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 Ruud PROUH50 T0 RU120-MSO cost to run per month?
About $16.38 a month at the U.S. average residential rate (18.3¢/kWh) — 54¢ a day, or $197 a year. Your state's rate moves this up or down; see the table above.
Is the Ruud PROUH50 T0 RU120-MSO energy efficient?
It uses 11% less electricity than the median certified electric water heater.
What does the Ruud PROUH50 T0 RU120-MSO cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $141 a year in Nevada (13.1¢/kWh) and $565 in Hawaii (52.7¢/kWh).

Keep digging