WattCost

Data through June 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 $156 at the U.S. average electricity rate, or $12.96 a month. That puts it in the most efficient tenth of every certified electric water heater — 30% less electricity than the median, ranked 45 of 510. Where you live moves the bill from $111 a year in Nevada to $447 in Hawaii.

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 Lennox WHHP050T45MD240S (▮) sits among all 510 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
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)
Ariston ARIHPWH-50-T848$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 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 $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 Lennox WHHP050T45MD240S 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 Lennox WHHP050T45MD240S 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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