Model
Whirlpool WFW6605M**
Rank #314 means 313 of the 388 washing machine models we track cost less to run each year; the 45th efficiency percentile means it uses less energy for its size than 45% of those models.
What does the Whirlpool WFW6605M** cost to run per year?
Among the 388 washing machine models we track, the Whirlpool WFW6605M**'s $28/yr running cost ranks it #314, in the pricier fifth of the class. Capacity-normalized, it ranks ahead of 45% of washing machine models we track, right in the class's middle band. At a IMEF of 2.76, 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 WT7900H*A at $28/yr runs a little cheaper and the Ge GTW490BMR*** at $29/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 Whirlpool WFW6605M**'s $28/yr adds up to roughly $280 in electricity alone, before purchase price or repairs.
Also sold as: Lg WT7800H*A.
By the numbers
The Whirlpool WFW6605M** 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 $28/yr, here is what the Whirlpool WFW6605M** adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Whirlpool WFW6605M** costs about $280. That is roughly $80 more than the class median, which would run closer to $200 over the same ten years.
How the Whirlpool WFW6605M** compares
The washing machine class we track runs from $7 to $58 a year. At $28/yr, it runs about $8 a year above the class median of $20, and it is about $21 a year more than the cheapest washing machine to run at $7.
What drives its running cost
At 5 cu ft, the Whirlpool WFW6605M** is a mid-size washing machine for its class, which spans 1.9 to 6 cu ft with a median of 4.5 cu ft, right in the middle of the capacity range, so capacity is roughly a wash compared with the rest of the class. The IMEF of 2.76 on this model, above the class median of 2.76, measures integrated modified energy factor; it is the number to compare directly against another model's IMEF if capacity is similar.
- 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 Whirlpool WFW6605M** cheap to run?
Its $28/yr running cost, rank #314 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 Whirlpool WFW6605M** cost per month?
About $2.32 a month, which is the $28 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: 150 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $28 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Whirlpool WFW6605M** for its size?
45th 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 |
|---|---|---|
| 316 | Lg WT7900H*A5.5 cu ft | $28 |
| 315 | Lg WT7880H*A5.5 cu ft | $28 |
| 314 | Lg WT7800H*A5 cu ft | $28 |
| 313 | Lg WT7710H*A5.7 cu ft | $28 |
| 312 | Lg WT7700H*A5.7 cu ft | $28 |
Source
ES_22856_WFW6605M**_083120210749788_5800549View certified washing machine listingsENERGY STAR data as of July 2026Whirlpool and WFW6605M** 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.