Model
Lg WM8100H*A
Rank #222 means 221 of the 388 washing machine models we track cost less to run each year; the 70th efficiency percentile means it uses less energy for its size than 70% of those models.
What does the Lg WM8100H*A cost to run per year?
The Lg WM8100H*A holds rank #222 of 388 on running cost, at about $22 a year, an unremarkable but typical figure for the class. Efficiency-wise, once size is accounted for, it edges out 70% of the class, a modestly above-average showing. The IMEF figure of 2.92 on this model captures integrated modified energy factor, the main efficiency lever ENERGY STAR tracks for this class.
Immediately around it on the leaderboard, the Lg WM1455H*A at $22/yr runs a little cheaper and the Lg WM9000H*A at $22/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A washing machine typically stays in service for somewhere around 10 years; over that span, the Lg WM8100H*A's $22/yr adds up to roughly $220 in electricity alone, before purchase price or repairs.
Also sold as: Lg WM9000H*A, Samsung WA52A55**A*, Samsung WA52DG55**A*.
By the numbers
The Lg WM8100H*A normalized against its whole class, so each figure means something.
What it costs you over time
Running cost is an every-year number, so it compounds. At $22/yr, here is what the Lg WM8100H*A adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Lg WM8100H*A costs about $220. That is roughly $20 more than the class median, which would run closer to $200 over the same ten years.
How the Lg WM8100H*A compares
The washing machine class we track runs from $7 to $58 a year. At $22/yr, it runs about $2 a year above the class median of $20, and it is about $15 a year more than the cheapest washing machine to run at $7.
What drives its running cost
At 5.2 cu ft, the Lg WM8100H*A is a large washing machine for its class, which spans 1.9 to 6 cu ft with a median of 4.5 cu ft, size is usually the single biggest lever behind a running-cost figure, and at this end of the range there is more capacity to service, which tends to push the number up. Its IMEF of 2.92, above the class median of 2.76, reflects integrated modified energy factor: a higher figure means it wrings more useful work out of every kilowatt-hour, so it is the efficiency lever to weigh against raw size.
- Spin and wash efficiency (IMEF). IMEF is this class's core efficiency yardstick; two washers with the same drum size can carry meaningfully different IMEF figures and running costs.
- Drum volume. A larger-capacity washer can wash more per load, which can lower cost per pound of laundry, but it also draws more water and energy per cycle if you are not filling it.
- Water heating. Most washers rely on your home's hot water supply, but internal-heater sanitize or hot-wash cycles use meaningfully more electricity than a cold or warm wash.
Common questions
Is the Lg WM8100H*A cheap to run?
Roughly, yes. Its $22/yr figure is close to the class median, ranking #222 of 388, neither a bargain nor a splurge on running cost.
How much does the Lg WM8100H*A cost per month?
About $1.86 a month, which is the $22 annual estimate spread across twelve months at the US average rate of $0.1856/kWh. Your own bill scales with your local electricity rate and how heavily you use it.
How is this running-cost figure calculated?
The formula is annual kWh times price per kWh: 120 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $22 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Lg WM8100H*A for its size?
70th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 221 | Lg WM1455H*A2.4 cu ft | $22 |
| 220 | Lg WM1399H*A2.3 cu ft | $22 |
| 219 | Lg WM1388H*2.3 cu ft | $22 |
| 218 | Lg WM1385H*2.3 cu ft | $22 |
| 217 | Miele WXR9602.3 cu ft | $22 |
Source
ES_1118034_WM8100H*A_02092018060252_70172585View certified washing machine listingsENERGY STAR data as of July 2026Lg and WM8100H*A are used here for identification only and are not endorsements. Figures are computed by WattWise Labs from public ENERGY STAR data, not measured in our own lab.