Model
Lg WT8405C*
Rank #358 means 357 of the 388 washing machine models we track cost less to run each year; the 22nd efficiency percentile means it uses less energy for its size than 22% of those models.
What does the Lg WT8405C* cost to run per year?
The Lg WT8405C* holds rank #358 of 388 on running cost, at about $39 a year, a genuinely pricey result for the class. Its size-adjusted efficiency percentile of 22 suggests its capacity is doing more work than its efficiency to keep the headline cost down. At a IMEF of 2.06, 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 WT7155C* at $37/yr runs a little cheaper and the Midea MLTW53A5CCG at $40/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 WT8405C*'s $39/yr adds up to roughly $390 in electricity alone, before purchase price or repairs.
By the numbers
The Lg WT8405C* 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 $39/yr, here is what the Lg WT8405C* 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 WT8405C* costs about $390. That is roughly $190 more than the class median, which would run closer to $200 over the same ten years.
How the Lg WT8405C* compares
The washing machine class we track runs from $7 to $58 a year. At $39/yr, it runs about $19 a year above the class median of $20, and it is about $32 a year more than the cheapest washing machine to run at $7.
What drives its running cost
At 5.3 cu ft, the Lg WT8405C* is a large washing machine for its class, which spans 1.9 to 6 cu ft with a median of 4.5 cu ft, and larger washing machine models generally cost more to run than smaller ones in the same class, simply because there is more to keep cold, spin, heat, or light. Its IMEF of 2.06, below 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 WT8405C* cheap to run?
Its $39/yr running cost, rank #358 of 388, is above what most washing machine models we track cost to run, so this is not one of the cheaper picks on electricity alone.
How much does the Lg WT8405C* cost per month?
About $3.25 a month, which is the $39 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: 210 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $39 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Lg WT8405C* for its size?
22nd percentile once size is factored in. That means its size-adjusted efficiency is not the main reason for the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 357 | Lg WT7155C*4.8 cu ft | $37 |
| 356 | Whirlpool WTW8000D*+5.3 cu ft | $36 |
| 355 | Midea MLH52N4AWW4.5 cu ft | $33 |
| 354 | Lg WT7050C*4.5 cu ft | $33 |
| 353 | Ge GTW540A*P***4.6 cu ft | $32 |
Source
ES_1118034_WT8405C*4_12222023104340_80195532View certified washing machine listingsENERGY STAR data as of July 2026Lg and WT8405C* 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.