WattCost

Data through April 2026

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

Rheem PROPH80 T0 RH120-M

For a standard household draw pattern, the Rheem PROPH80 T0 RH120-M uses a certified 1,403 kWh per year: roughly $264 annually at the national average rate. It sits near the bottom of the certified table — using 30% more than the median electric water heater (rank 528 of 566) — so the state you live in matters more than usual. The same unit costs $173 a year in North Dakota but $654 in Hawaii — electricity rates, not the appliance, make the difference.

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

$264/yr

$121 · cheapest certified water heaters (electric)$328 · priciest
Per month
$22.02
Per day
72¢
Certified use
1,403 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
120 Volt Integrated HPWH
Storage volume
72 gal
First-hour rating
84 gal
UEF
3.46
643 kWh1,741 kWh
Where the Rheem PROPH80 T0 RH120-M (▮) sits among all 566 certified water heaters (electric), by annual kWh

What it costs in every state

Rheem PROPH80 T0 RH120-M: 1,403 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama17.4¢$244
Alaska27.4¢$384
Arizona15.5¢$217
Arkansas14.2¢$199
California35.3¢$495
Colorado16.5¢$232
Connecticut32.2¢$452
Delaware18.8¢$264
District of Columbia25.4¢$357
Florida15.4¢$216
Georgia15.4¢$216
Hawaiipriciest46.6¢$654
Idaho12.7¢$178
Illinois20.5¢$287
Indiana17.9¢$251
Iowa13.9¢$194
Kansas15.8¢$221
Kentucky15.0¢$211
Louisiana14.4¢$203
Maine28.4¢$399
Maryland22.1¢$310
Massachusetts29.4¢$413
Michigan21.4¢$300
Minnesota16.4¢$230
Mississippi16.8¢$235
Missouri14.0¢$197
Montana13.9¢$195
Nebraska13.3¢$186
Nevada14.3¢$200
New Hampshire27.2¢$382
New Jersey23.5¢$330
New Mexico15.2¢$213
New York29.4¢$413
North Carolina16.3¢$228
North Dakotacheapest12.3¢$173
Ohio19.5¢$273
Oklahoma13.3¢$187
Oregon15.8¢$221
Pennsylvania21.5¢$301
Rhode Island28.3¢$397
South Carolina17.1¢$239
South Dakota14.5¢$204
Tennessee14.9¢$210
Texas17.0¢$238
Utah13.3¢$186
Vermont24.6¢$345
Virginia17.4¢$244
Washington14.4¢$201
West Virginia16.1¢$225
Wisconsin19.2¢$270
Wyoming14.7¢$206

Certified models closest in efficiency

electric water heaters within reach of 1,403 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich PROH80 T0 FD120-M1,403$264
Friedrich PROH80 T0 FD120-MSO1,403$264
Rheem PROPH80 T0 RH120-MSO1,403$264
Rheem XE80T10HM00U01,403$264
Rheem XE80T10HMS00U01,403$264
Richmond 10E80-HP120M1,403$264

Run your own numbers

Your rate, your numbers

Per day
72¢
Per month
$22.02
Per year
$264

1,403 kWh/yr × 18.8¢/kWh = $264/yr

Prefilled with this model's certified 1,403 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 PROPH80 T0 RH120-M use?
ENERGY STAR certifies the Rheem PROPH80 T0 RH120-M at 1,403 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 PROPH80 T0 RH120-M cost to run per month?
About $22.02 a month at the U.S. average residential rate (18.8¢/kWh) — 72¢ a day, or $264 a year. Your state's rate moves this up or down; see the table above.
Is the Rheem PROPH80 T0 RH120-M energy efficient?
It uses 30% more electricity than the median certified electric water heater, which puts it among the least efficient certified models.
What does the Rheem PROPH80 T0 RH120-M cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $173 a year in North Dakota (12.3¢/kWh) and $654 in Hawaii (46.6¢/kWh).

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