Model
Lg Signature WM9998H*A
Rank #168 means 167 of the 388 washing machine models we track cost less to run each year; the 95th efficiency percentile means it uses less energy for its size than 95% of those models.
What does the Lg Signature WM9998H*A cost to run per year?
Ranking #168 of 388, the Lg Signature WM9998H*A runs at roughly $20 a year, neither the cheapest nor the priciest in its class. Adjusted for its imef, it is more efficient than 95% of washing machine models we track, one of the strongest results in the whole class. At a IMEF of 3.2, its integrated modified energy factor is the single figure that best explains how it earns its running-cost number.
Immediately around it on the leaderboard, the Lg Signature WM9901H*A at $20/yr runs a little cheaper and the Aeg W14120 at $20/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 Signature WM9998H*A's $20/yr adds up to roughly $200 in electricity alone, before purchase price or repairs.
Also sold as: Lg Signature WM9700H*A.
By the numbers
The Lg Signature WM9998H*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 $20/yr, here is what the Lg Signature WM9998H*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 Signature WM9998H*A costs about $200. That is roughly $0 less than the class median, which would run closer to $200 over the same ten years.
How the Lg Signature WM9998H*A compares
The washing machine class we track runs from $7 to $58 a year. At $20/yr, it sits right on the class median of $20, and it is about $13 a year more than the cheapest washing machine to run at $7.
What drives its running cost
At 5.8 cu ft, the Lg Signature WM9998H*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 3.2, 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). A higher Integrated Modified Energy Factor means the machine wrings more useful washing (and a drier spin) out of every kilowatt-hour and gallon it uses.
- Drum volume. Drum volume sets the ceiling on how much a single cycle can wash, and it is usually the first driver of a washer's per-cycle energy use.
- Water heating. Cycle temperature, more than drum size, is usually what separates a cheap wash cycle from an expensive one on models with an internal water heater.
Common questions
Is the Lg Signature WM9998H*A cheap to run?
It is about average. At $20 a year it ranks #168 of 388 washing machine models we track, close to the middle of its class on running cost.
How much does the Lg Signature WM9998H*A cost per month?
Roughly $1.67/mo, spreading the $20/yr estimate evenly across twelve months at $0.1856/kWh. Actual monthly bills swing with your rate and usage pattern.
How is this running-cost figure calculated?
We take the model's published annual energy use of 108 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $20 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Lg Signature WM9998H*A for its size?
95th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 170 | Lg Signature WM9901H*A5.8 cu ft | $20 |
| 169 | Lg Signature WM9900H*A5.8 cu ft | $20 |
| 168 | Lg Signature WM9700H*A5.8 cu ft | $20 |
| 167 | Haier QFW150S*N***2.4 cu ft | $20 |
| 166 | Smeg WM24UWH2.3 cu ft | $20 |
Source
ES_1118034_WM9998H*A_01192026114829_80285281View certified washing machine listingsENERGY STAR data as of July 2026Lg Signature and WM9998H*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.