LG WT7800C
Filed with DOE as WT7800C*. An asterisk in a model number stands for any character: this one filing covers several variants.
588 kWh a year DOE CCD (opens in a new tab) (the U.S. Department of Energy’s Compliance Certification Database) · 2026-10-25with an electric water heater and an electric dryer
IMEF 2.76 filed efficiency; the yearly figure is computed from it
A top-loading washer of standard size (1.6 cubic feet or more). Drum: 5.5 cubic feet.
Label numbers this filing covers (1)
The model number on your rating plate may be any of these; each is filed under this one listing.
- WT7800C*
Checking the registered figures for the LG WT7800C*? With an electric water heater and dryer, it uses 588 kWh a year at DOE's test use, plus 5,192 gallons of water. Its IMEF, the cubic feet of laundry washed per kilowatt-hour, dryer included, is 2.76. That ranks 1st highest of 870 top-loading, standard-size washers.
Energy and water per year
588 kWh a year with an electric water heater and an electric dryer
Computed by this site from the registry's IMEF and drum capacity at DOE's test use of 295 cycles a year. IMEF counts the washer, heating its water electrically, and the electric dryer's work on what the spin leaves wet — so this is the total for that kind of home. How it is calculated
The machine and its hot water alone, dryer not included: 130 kWh a year, as ENERGY STAR files it.
Not published: A home with a gas water heater, a gas dryer or line drying
DOE's rating assumes electric water heating and an electric dryer and files no split between the machine, the water heating and the drying.
Such a home uses less electricity than the total above; how much less, no registry says for this model.
5,192 gallons of water a year
Computed from the registry's IWF and drum capacity at the same 295 cycles a year.
Not published: What the water costs
water and sewer rates are set by thousands of local utilities and no free national source publishes them.
The gallons above are the figure to multiply by your own water and sewer rate.
This model is rated above the federal minimum IMEF for its class.
DOE CCD (opens in a new tab) · 2026-10-25What it costs to run where you live
See what the middle washer of each product class costs to run on your rate.
What the registry files
From DOE CCD · 2026-10-25
- IMEF (Integrated Modified Energy Factor) how many cubic feet of drum a washer cleans for each kilowatt-hour, counting the machine, heating the water and drying what the spin leaves wet
- 2.76 Compared only with other top-loading, standard size washers.
- IWF (Integrated Water Factor) how many gallons of water a washer uses per cycle for each cubic foot of drum
- 3.2
- Clothes container capacity the volume of the drum in cubic feet, as DOE's test measures it
- 5.5 ft³
- Federal minimum IMEF for this class
- 1.57
From ENERGY STAR · 2026-10-25
- ENERGY STAR
- ENERGY STAR certified.
Installed cost and service life
$1,183–$1,691 installed
Not a quote — a modeled range of what installers have charged for this class of unit; your price will vary with labor rates, access, and local code requirements.
Brought to current prices with Bureau of Labor Statistics indexes: equipment to August 2026, installation labor to April 2026–June 2026.
NLR REMDB (BLS PPI/ECI escalated) · 2026-04-01Service life: DOE’s cost database assumes 11 years for top-loading washers. That is a class assumption, not this model’s rating or a warranty — no registry publishes either.
NLR REMDB v4.0.0 · 2026-09-29Safety record
No CPSC recall names this model.
Checked against the CPSC recall database. CPSC does not publish a model-level match for this product category, so this list is curated by hand from the manufacturer's recall filings.
CPSC · 2026-09-29What these figures mean
Where the hot water in this figure comes from
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Water heaters
The other big user of hot water in a home, with every model on file.
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What a water heater costs to run
Prices a water heater’s efficiency against your own utility’s tariff.
Closest in its class
- LG WT7400C 588 kWh a year
- LG WT7700H…A 609 kWh a year
- LG WT7900H…A 588 kWh a year
- LG WT8600C 588 kWh a year
Keep going
How every figure on this page is calculated
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Top-load washers ranked by filed efficiency (IMEF)
Ranked by filed IMEF inside each class, recalled models left out.
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Most energy-efficient clothes washers
Ranked by filed IMEF inside each class, recalled models left out.
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Top load vs front load washing machine
The filed IMEF, yearly energy, water, drum size and installed-cost range of every standard-size top-loading and front-loading washer, side by side from the DOE registry.
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How much water and electricity does a washing machine use?
The yearly gallons and kWh of every residential washer on file, by product class with the full spread, plus the exact per-cycle figures, and the watts no registry files declared as a gap.
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Every LG washer on file
What the brand files, by product class.
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Every clothes washer on file
All four product classes, from the DOE registry.
The 588 kWh a year assumes an electric water heater and an electric dryer, so it counts the dryer's energy as well as the washer's. This site computes it from the registry's IMEF and capacity, the drum's volume in cubic feet, at DOE's test use. For this model the capacity is 5.5 cubic feet and the IMEF is 2.76, taken from the DOE Compliance Certification Database on 2026-10-25. ENERGY STAR files a separate machine-only figure of 130 kWh a year for this washer. That value counts only the machine and the water it heats electrically, and it leaves out the dryer. The difference between 130 kWh and 588 kWh therefore reflects the dryer, which only the larger figure includes. The arithmetic behind both yearly figures is on the page about how the yearly energy and water figures are calculated.
Read the rest
The 5,192 gallons a year comes from the IWF, the gallons of water used per cycle for each cubic foot of drum. This model's IWF is 3.2, which this site applies to its 5.5 cubic feet at DOE's test use. The registry lists only the factor, and the yearly gallon total is this site's own calculation. The page gives no cost for those 5,192 gallons, because no free national source publishes local water and sewer rates. Any cost stated here would be an estimate, so the page does not give one. The data also carry no class median for IWF. So the page cannot show how this washer's water use compares with other top-loading, standard-size models.
This washer is compared with the 870 models registered as top-loading, standard size. Among them, its IMEF of 2.76 ranks 1st highest, and the class median is 1.57. Of those 870 models, 652 are rated at the federal minimum IMEF for the class, and this one is rated above it. The yearly running cost is not written here, because it depends on your own utility's electricity tariff. Instead of giving one national figure, the page computes this cost from your ZIP code. The installed price range has its own block, with its source and date, and it is a modeled range rather than a quote. Other models of this type can be reached from all clothes washer pages.