Appliance Energy Cost Index Model-level energy use and running cost, from ENERGY STAR certified product data

WM3420C* Clothes Washers · LG

WM3420C* (LG, ENERGY STAR Most Efficient) uses 80 kWh per year, an estimated $13.60/yr to run, ranking 23rd cheapest of 80 sampled clothes washers, 27% below the $18.70/yr median of the 80 sampled models.

Certification: ENERGY STAR Most Efficient

Est. annual energy cost
$13.60/yr
Cheaper than all but 28% of sampled models in this category
Annual energy use: 80 kWh
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Where this model sits (computed from source data)

Figures above are computed at build time from the sampled source records - no external estimates are used.
Cost rank in category23rd of 80
Cost percentilebottom 28%
Vs category median27% below ($18.70/yr)
Rank within same status3rd of 6 (Median $16.83/yr)
Rank within similar capacity1st of 31 · volume cubic feet 3.6~5.4 (Median $19.89/yr)
Category low to high$6.63/yr ~ $36.38/yr

Certified specifications (as reported)

Specifications exactly as reported in the certified dataset.
SpecValue
load configurationFront Load
additional washer featuresNone
intended marketResidential
volume cubic feet4.50
width inches27.0
integrated modified energy factor imef3.1
us federal standard imef1.84
annual energy use kwh year80
integrated water factor iwf2.9
us federal standard iwf4.7
annual water use gallons year3858
connectedNo
paired energy star clothes dryer availableNo
date available on market2026-01-07
date qualified2026-01-12
meets most efficient criteriaYes

Similar models in this category

Closest capacity first (at most two rows per identical cost).
ModelCertificationEst. energy cost
WM3580C* ENERGY STAR Certified$17.85/yr
MLHW52S7AWW ENERGY STAR Certified$19.04/yr
MLHW52S7AGG ENERGY STAR Certified$19.04/yr
WEF5727T** ENERGY STAR Certified$23.80/yr
WGF5727T** ENERGY STAR Certified$23.80/yr

Frequently asked questions

How much does it cost to run the LG WM3420C* per year?

The LG WM3420C* is certified at 80 kWh per year, which works out to about $13.60/yr at the flat rate assumed on this site. Certified figures come from standardized test procedures, so your actual bill varies with usage and your local electricity rate.

Is the LG WM3420C* efficient compared with other clothes washers?

Among the 80 clothes washers compared on this site, the LG WM3420C* ranks 23rd cheapest to run and sits in the bottom 28% of the cost range. That is 27% below the category median of $18.70/yr. The cheapest sampled model runs at $6.63/yr and the most expensive at $36.38/yr.

What ENERGY STAR status does the LG WM3420C* hold?

The LG WM3420C* is listed as ENERGY STAR Most Efficient. Among the 6 sampled clothes washers with that status the median running cost is $16.83/yr, and the LG WM3420C* ranks 3rd cheapest within that group. Certification status reflects efficiency relative to product class, not absolute energy use.

How does the LG WM3420C* compare with similarly sized models?

Using the certified volume cubic feet value of 4.5, 31 sampled models fall within +/-20% (3.6 to 5.4), and the LG WM3420C* ranks 1st cheapest among them. The median for that size band is $19.89/yr. Comparing within a size band is more meaningful than comparing certification labels.

Quick electricity cost calculator

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Simple estimate, 30 days per month (assuming $0.17/kWh)