WattCost

Data through June 2026

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

Ruud PROUH50 T2 RU400-30

For a standard household draw pattern, the Ruud PROUH50 T2 RU400-30 uses a certified 846 kWh per year: roughly $155 annually at the national average rate. Only a handful of certified electric water heaters do better: it ranks 42 of 510 and undercuts the median by 30%. Where you live moves the bill from $111 a year in Nevada to $446 in Hawaii.

Dimensions 61.8" H × 22.3" W

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

$155/yr

$125 · cheapest certified water heaters (electric)$319 · priciest
Per month
$12.93
Per day
43¢
Certified use
846 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
240 Volt Integrated HPWH
Storage volume
45 gal
First-hour rating
67 gal
UEF
3.88
681 kWh1,741 kWh
Where the Ruud PROUH50 T2 RU400-30 (▮) sits among all 510 certified water heaters (electric), by annual kWh

What it costs in every state

Ruud PROUH50 T2 RU400-30: 846 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$139
Alaska28.2¢$239
Arizona15.2¢$128
Arkansas14.1¢$119
California34.7¢$294
Colorado17.1¢$145
Connecticut24.3¢$206
Delaware19.3¢$163
District of Columbia24.4¢$206
Florida15.1¢$128
Georgia16.4¢$138
Hawaiipriciest52.7¢$446
Idaho14.4¢$122
Illinois19.9¢$168
Indiana17.5¢$148
Iowa15.9¢$135
Kansas15.7¢$133
Kentucky14.3¢$121
Louisiana13.5¢$114
Maine29.6¢$250
Maryland21.8¢$185
Massachusetts29.6¢$251
Michigan23.0¢$194
Minnesota17.5¢$148
Mississippi14.9¢$126
Missouri16.2¢$137
Montana15.1¢$128
Nebraska13.3¢$112
Nevadacheapest13.1¢$111
New Hampshire27.0¢$229
New Jersey24.9¢$211
New Mexico15.1¢$127
New York29.5¢$249
North Carolina14.7¢$125
North Dakota14.1¢$119
Ohio19.2¢$162
Oklahoma14.3¢$121
Oregon16.3¢$138
Pennsylvania21.7¢$184
Rhode Island29.2¢$247
South Carolina15.6¢$132
South Dakota15.4¢$130
Tennessee14.1¢$119
Texas15.9¢$135
Utah13.4¢$113
Vermont24.4¢$207
Virginia17.2¢$146
Washington14.9¢$126
West Virginia15.4¢$131
Wisconsin19.6¢$165
Wyoming15.2¢$129

Certified models closest in efficiency

electric water heaters within reach of 846 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich PROH50 T2 FD400-30846$155
Friedrich PROH50 T2 FD400-SO846$155
Rheem PROPH50 T2 RH375-30846$155
Rheem PROPH50 T2 RH400-30846$155
Rheem PROPH50 T2 RH400-SO846$155
Rheem XE50T10H45U1846$155

Run your own numbers

Your rate, your numbers

Per day
43¢
Per month
$12.93
Per year
$155

846 kWh/yr × 18.3¢/kWh = $155/yr

Prefilled with this model's certified 846 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 T2 RU400-30 use?
ENERGY STAR certifies the Ruud PROUH50 T2 RU400-30 at 846 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 T2 RU400-30 cost to run per month?
About $12.93 a month at the U.S. average residential rate (18.3¢/kWh) — 43¢ a day, or $155 a year. Your state's rate moves this up or down; see the table above.
Is the Ruud PROUH50 T2 RU400-30 energy efficient?
It uses 30% less electricity than the median certified electric water heater, placing it in the top 10% of certified models.
What does the Ruud PROUH50 T2 RU400-30 cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $111 a year in Nevada (13.1¢/kWh) and $446 in Hawaii (52.7¢/kWh).

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