WattCost

Data through April 2026

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

Ariston ARIHPWH-40

For a standard household draw pattern, the Ariston ARIHPWH-40 uses a certified 907 kWh per year: roughly $171 annually at the national average rate. Compared with the median certified electric water heater, it uses 16% less electricity — rank 186 out of 566. The same unit costs $112 a year in North Dakota but $423 in Hawaii — electricity rates, not the appliance, make the difference.

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

$171/yr

$121 · cheapest certified water heaters (electric)$328 · priciest
Per month
$14.23
Per day
47¢
Certified use
907 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
240 Volt Integrated HPWH
Storage volume
37 gal
First-hour rating
66 gal
UEF
3.58
643 kWh1,741 kWh
Where the Ariston ARIHPWH-40 (▮) sits among all 566 certified water heaters (electric), by annual kWh

What it costs in every state

Ariston ARIHPWH-40: 907 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama17.4¢$158
Alaska27.4¢$248
Arizona15.5¢$140
Arkansas14.2¢$128
California35.3¢$320
Colorado16.5¢$150
Connecticut32.2¢$292
Delaware18.8¢$170
District of Columbia25.4¢$230
Florida15.4¢$139
Georgia15.4¢$139
Hawaiipriciest46.6¢$423
Idaho12.7¢$115
Illinois20.5¢$186
Indiana17.9¢$162
Iowa13.9¢$126
Kansas15.8¢$143
Kentucky15.0¢$136
Louisiana14.4¢$131
Maine28.4¢$258
Maryland22.1¢$200
Massachusetts29.4¢$267
Michigan21.4¢$194
Minnesota16.4¢$149
Mississippi16.8¢$152
Missouri14.0¢$127
Montana13.9¢$126
Nebraska13.3¢$120
Nevada14.3¢$130
New Hampshire27.2¢$247
New Jersey23.5¢$213
New Mexico15.2¢$137
New York29.4¢$267
North Carolina16.3¢$147
North Dakotacheapest12.3¢$112
Ohio19.5¢$177
Oklahoma13.3¢$121
Oregon15.8¢$143
Pennsylvania21.5¢$195
Rhode Island28.3¢$257
South Carolina17.1¢$155
South Dakota14.5¢$132
Tennessee14.9¢$136
Texas17.0¢$154
Utah13.3¢$121
Vermont24.6¢$223
Virginia17.4¢$158
Washington14.4¢$130
West Virginia16.1¢$146
Wisconsin19.2¢$174
Wyoming14.7¢$133

Certified models closest in efficiency

electric water heaters within reach of 907 kWh/yr
ModelkWh/yr$/yr (US avg)
AMERICAN STANDARD WATER HEATERS ASHPWH-40907$171
A. O. Smith HP1050H45DV 1902$170
A. O. Smith HP1050H45DVCTA-1902$170
A. O. Smith HPA10-40H45DV 2902$170
A. O. Smith HPTA-40 2902$170
A. O. Smith HPTU-50CTA 1902$170

Run your own numbers

Your rate, your numbers

Per day
47¢
Per month
$14.23
Per year
$171

907 kWh/yr × 18.8¢/kWh = $171/yr

Prefilled with this model's certified 907 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-40 use?
ENERGY STAR certifies the Ariston ARIHPWH-40 at 907 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-40 cost to run per month?
About $14.23 a month at the U.S. average residential rate (18.8¢/kWh) — 47¢ a day, or $171 a year. Your state's rate moves this up or down; see the table above.
Is the Ariston ARIHPWH-40 energy efficient?
It uses 16% less electricity than the median certified electric water heater, placing it in the efficient third of certified models.
What does the Ariston ARIHPWH-40 cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $112 a year in North Dakota (12.3¢/kWh) and $423 in Hawaii (46.6¢/kWh).

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