WattCost

Data through April 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 $160 annually at the national average rate. That's 22% less than the median certified electric water heater, placing it comfortably in the efficient third of the field (64 of 566). The same unit costs $105 a year in North Dakota but $395 in Hawaii — electricity rates, not the appliance, make the difference.

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

$160/yr

$121 · cheapest certified water heaters (electric)$328 · priciest
Per month
$13.31
Per day
44¢
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
643 kWh1,741 kWh
Where the Ariston ARIHPWH-50-T (▮) sits among all 566 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
Alabama17.4¢$148
Alaska27.4¢$232
Arizona15.5¢$131
Arkansas14.2¢$120
California35.3¢$299
Colorado16.5¢$140
Connecticut32.2¢$273
Delaware18.8¢$159
District of Columbia25.4¢$215
Florida15.4¢$130
Georgia15.4¢$130
Hawaiipriciest46.6¢$395
Idaho12.7¢$108
Illinois20.5¢$174
Indiana17.9¢$152
Iowa13.9¢$118
Kansas15.8¢$134
Kentucky15.0¢$127
Louisiana14.4¢$122
Maine28.4¢$241
Maryland22.1¢$187
Massachusetts29.4¢$250
Michigan21.4¢$181
Minnesota16.4¢$139
Mississippi16.8¢$142
Missouri14.0¢$119
Montana13.9¢$118
Nebraska13.3¢$113
Nevada14.3¢$121
New Hampshire27.2¢$231
New Jersey23.5¢$200
New Mexico15.2¢$128
New York29.4¢$250
North Carolina16.3¢$138
North Dakotacheapest12.3¢$105
Ohio19.5¢$165
Oklahoma13.3¢$113
Oregon15.8¢$134
Pennsylvania21.5¢$182
Rhode Island28.3¢$240
South Carolina17.1¢$145
South Dakota14.5¢$123
Tennessee14.9¢$127
Texas17.0¢$144
Utah13.3¢$113
Vermont24.6¢$208
Virginia17.4¢$147
Washington14.4¢$122
West Virginia16.1¢$136
Wisconsin19.2¢$163
Wyoming14.7¢$124

Certified models closest in efficiency

electric water heaters within reach of 848 kWh/yr
ModelkWh/yr$/yr (US avg)
Lennox WHHP050T45MD240S848$160
Friedrich PROH50 T2 FD400-15846$159
Friedrich PROH50 T2 FD400-30846$159
Friedrich PROH50 T2 FD400-SO846$159
Rheem PROPH50 T2 RH375-15846$159
Rheem PROPH50 T2 RH375-30846$159

Run your own numbers

Your rate, your numbers

Per day
44¢
Per month
$13.31
Per year
$160

848 kWh/yr × 18.8¢/kWh = $160/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 $13.31 a month at the U.S. average residential rate (18.8¢/kWh) — 44¢ a day, or $160 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 22% less electricity than the median certified electric water heater, placing it in the efficient third 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 $105 a year in North Dakota (12.3¢/kWh) and $395 in Hawaii (46.6¢/kWh).

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