WattCost

Data through April 2026

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

Lennox WHHP050T45MD240S

Heating a typical household's hot water, the Lennox WHHP050T45MD240S is certified at 848 kWh a year — about $160 at the U.S. average electricity rate, or $13.31 a month. That's 22% less than the median certified electric water heater, placing it comfortably in the efficient third of the field (65 of 566). Where you live moves the bill from $105 a year in North Dakota to $395 in Hawaii.

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 Lennox WHHP050T45MD240S (▮) sits among all 566 certified water heaters (electric), by annual kWh

What it costs in every state

Lennox WHHP050T45MD240S: 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)
Ariston ARIHPWH-50-T848$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 Lennox WHHP050T45MD240S use?
ENERGY STAR certifies the Lennox WHHP050T45MD240S 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 Lennox WHHP050T45MD240S 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 Lennox WHHP050T45MD240S 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 Lennox WHHP050T45MD240S 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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