Rheem XE40T10HMS00U0

ENERGY STAR certified

Heat pump water heater · 36 gallons

InYour statethis water heater costs

about $12 a month

$141 a year

An estimate at your state's average rate — not a guarantee of your bill.

Estimated yearly cost

$109

a year

The yellow sticker says $109 a year.

You'll pay $32 more.

Sticker uses 14¢ per kWh. The U.S. average is 18.0¢ per kWh.

Energy use

780 kWh a year

vs similar heat pump water heater

-31%

Cheaper water heaters, same size

ENERGY STAR lists 9 other certified models at the same 780 kWh a year, size and type, so everything on this page applies to them too.

Compare all 42 water heaters under 45 gallons

Cost in every state

780 kWh a year × each state's average residential rate (EIA 12-month average through July 2026).

State	Rate	Per year	Per month
Hawaii	43.7¢	$341	about $28 a month
California	33.1¢	$258	about $22 a month
Massachusetts	30.4¢	$237	about $20 a month
Rhode Island	29.4¢	$229	about $19 a month
Maine	29.3¢	$228	about $19 a month
New York	28.4¢	$221	about $18 a month
Connecticut	28.2¢	$220	about $18 a month
Alaska	27.0¢	$211	about $18 a month
New Hampshire	26.8¢	$209	about $17 a month
District of Columbia	24.2¢	$189	about $16 a month

Show all 52 states

Vermont	23.9¢	$186	about $16 a month
New Jersey	23.6¢	$184	about $15 a month
Maryland	22.3¢	$174	about $15 a month
Michigan	21.0¢	$164	about $14 a month
Pennsylvania	20.8¢	$162	about $13 a month
Illinois	19.0¢	$148	about $12 a month
Wisconsin	18.8¢	$146	about $12 a month
Ohio	18.3¢	$143	about $12 a month
U.S. average	18.0¢	$141	about $12 a month
Delaware	18.0¢	$140	about $12 a month
Indiana	17.1¢	$133	about $11 a month
Virginia	16.6¢	$129	about $11 a month
Colorado	16.6¢	$129	about $11 a month
Alabama	16.5¢	$129	about $11 a month
Minnesota	16.2¢	$127	about $11 a month
Texas	16.0¢	$125	about $10 a month
South Carolina	15.7¢	$123	about $10 a month
West Virginia	15.7¢	$122	about $10 a month
Oregon	15.6¢	$122	about $10 a month
Arizona	15.5¢	$121	about $10 a month
Florida	15.4¢	$120	about $10 a month
New Mexico	15.2¢	$119	about $10 a month
Kansas	15.1¢	$118	about $10 a month
Georgia	15.1¢	$118	about $10 a month
Mississippi	14.9¢	$116	about $10 a month
North Carolina	14.9¢	$116	about $10 a month
South Dakota	14.3¢	$111	about $9 a month
Washington	14.2¢	$110	about $9 a month
Wyoming	14.2¢	$110	about $9 a month
Iowa	14.1¢	$110	about $9 a month
Kentucky	14.0¢	$109	about $9 a month
Montana	13.9¢	$109	about $9 a month
Missouri	13.9¢	$108	about $9 a month
Tennessee	13.7¢	$107	about $9 a month
Oklahoma	13.6¢	$106	about $9 a month
Nevada	13.6¢	$106	about $9 a month
Arkansas	13.5¢	$105	about $9 a month
Utah	13.3¢	$104	about $9 a month
Louisiana	13.1¢	$102	about $8 a month
Nebraska	12.9¢	$101	about $8 a month
Idaho	12.7¢	$99	about $8 a month
North Dakota	12.5¢	$98	about $8 a month

What the Rheem XE40T10HMS00U0 costs where electricity is expensive

At Hawaii's average residential rate of 43.7¢ per kWh, the Rheem XE40T10HMS00U0 costs $341 a year — $232 more a year than the label says. The EnergyGuide label estimates $109 a year, because every label in the country is calculated at 14¢ per kWh. At the U.S. average of 18.0¢ per kWh this water heater costs $141 a year, and in North Dakota, the cheapest state, $98 a year.

Estimated annual running cost for the Rheem XE40T10HMS00U0 in the highest-rate states and the lowest-rate state
Where	Rate	Cost a year	vs the label
Hawaii	43.7¢ per kWh	$341	+$232
California	33.1¢ per kWh	$258	+$149
Massachusetts	30.4¢ per kWh	$237	+$128
Rhode Island	29.4¢ per kWh	$229	+$120
Maine	29.3¢ per kWh	$228	+$119
North Dakota	12.5¢ per kWh	$98	−$11

Electricity prices: EIA 12-month average through July 2026, residential sector, average revenue per kWh. Label figure calculated at 14¢ per kWh, the rate the FTC requires on labels.

Full specs

At the U.S. average residential rate this one costs $141 a year — about 31% cheaper to run than the average heat pump water heater ($203 a year across 510 certified models).

$141

Most efficient $123Average $203Least efficient $314

Every model on this scale is ENERGY STAR certified. Range across 510 heat pump water heaters, priced a year at the U.S. average residential rate.

Brand: Rheem
Model number: XE40T10HMS00U0
Model name: Heat Pump
Type: Heat pump water heater
Capacity: 36 gallons
Annual energy use: 780 kWh a year
Combined Energy Factor (CEF): 2.8
ENERGY STAR Most Efficient: No
On the market since: April 2022
Certified: November 2024
Tank volume (gallons): 36
First-hour rating (gallons): 45
Uniform Energy Factor (UEF): 2.80
Draw pattern: Low-Usage
Heat pump type: 120 Volt Integrated HPWH
Recovery efficiency (%): 387.00
Tank height (in): 62.3
Tank diameter (in): 20.3

Where to buy

We do not sell appliances. These open a search on the retailer's own site.

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Common questions

+How much does the Rheem XE40T10HMS00U0 cost to run per month?

about $12 a month at the U.S. average residential rate of 18.0¢ per kWh, or $141 a year. Your cost depends on your state's rate — see the table above.

+How many kWh does the Rheem XE40T10HMS00U0 use?

780 kWh a year, as the manufacturer filed it with the EPA, in the ENERGY STAR certified product database.

+Is the Rheem XE40T10HMS00U0 energy efficient?

It is listed as ENERGY STAR certified. It uses about 31% less electricity than the average heat pump water heater (average: 1,123 kWh a year).

+How does the Rheem XE40T10HMS00U0 compare to the average water heater?

The average heat pump water heater in our database uses 1,123 kWh a year, costing $203 a year at the U.S. average residential rate. The Rheem XE40T10HMS00U0 uses 780 kWh a year, costing $141 a year.

How we calculate this

Annual energy use (780 kWh a year) is the figure the manufacturer filed for this model with the EPA, in the ENERGY STAR certified product database. Running cost is that figure multiplied by a state's average residential electricity price from the U.S. Energy Information Administration (12-month average through July 2026, average revenue per kWh).

The annual figure for a water heater assumes a hot water draw of 10, 38, 55 or 84 gallons a day, set by the heater's first-hour rating, per the DOE test procedure (10 CFR 430 Subpart B, Appendix E). Full methodology.

Sources: EPA ENERGY STAR certified product data, updated weekly · U.S. EIA electricity prices, 12-month average through July 2026.