WattCost

Data through June 2026

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

Ariston ARIHPWH-50-T

For a standard household draw pattern, the Ariston ARIHPWH-50-T uses a certified 848 kWh per year: roughly $156 annually at the national average rate. That puts it in the most efficient tenth of every certified electric water heater — 30% less electricity than the median, ranked 44 of 510. The same unit costs $111 a year in Nevada but $447 in Hawaii — electricity rates, not the appliance, make the difference.

Dimensions 45.8" H × 18.2" W

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

$156/yr

$125 · cheapest certified water heaters (electric)$319 · priciest
Per month
$12.96
Per day
43¢
Certified use
848 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
240 Volt Integrated HPWH
Storage volume
45 gal
First-hour rating
69 gal
UEF
3.83
681 kWh1,741 kWh
Where the Ariston ARIHPWH-50-T (▮) sits among all 510 certified water heaters (electric), by annual kWh

What it costs in every state

Ariston ARIHPWH-50-T: 848 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$139
Alaska28.2¢$239
Arizona15.2¢$129
Arkansas14.1¢$120
California34.7¢$295
Colorado17.1¢$145
Connecticut24.3¢$206
Delaware19.3¢$164
District of Columbia24.4¢$207
Florida15.1¢$128
Georgia16.4¢$139
Hawaiipriciest52.7¢$447
Idaho14.4¢$122
Illinois19.9¢$169
Indiana17.5¢$148
Iowa15.9¢$135
Kansas15.7¢$133
Kentucky14.3¢$121
Louisiana13.5¢$114
Maine29.6¢$251
Maryland21.8¢$185
Massachusetts29.6¢$251
Michigan23.0¢$195
Minnesota17.5¢$149
Mississippi14.9¢$126
Missouri16.2¢$138
Montana15.1¢$128
Nebraska13.3¢$112
Nevadacheapest13.1¢$111
New Hampshire27.0¢$229
New Jersey24.9¢$212
New Mexico15.1¢$128
New York29.5¢$250
North Carolina14.7¢$125
North Dakota14.1¢$120
Ohio19.2¢$163
Oklahoma14.3¢$122
Oregon16.3¢$138
Pennsylvania21.7¢$184
Rhode Island29.2¢$248
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¢$166
Wyoming15.2¢$129

Certified models closest in efficiency

electric water heaters within reach of 848 kWh/yr
ModelkWh/yr$/yr (US avg)
Lennox WHHP050T45MD240S848$156
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

Run your own numbers

Your rate, your numbers

Per day
43¢
Per month
$12.96
Per year
$156

848 kWh/yr × 18.3¢/kWh = $156/yr

Prefilled with this model's certified 848 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 Ariston ARIHPWH-50-T use?
ENERGY STAR certifies the Ariston ARIHPWH-50-T at 848 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 Ariston ARIHPWH-50-T cost to run per month?
About $12.96 a month at the U.S. average residential rate (18.3¢/kWh) — 43¢ a day, or $156 a year. Your state's rate moves this up or down; see the table above.
Is the Ariston ARIHPWH-50-T 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 Ariston ARIHPWH-50-T 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 $447 in Hawaii (52.7¢/kWh).

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