Model
Kenmore 405.4227##
Rank #174 means 173 of the 388 washing machine models we track cost less to run each year; the 61st efficiency percentile means it uses less energy for its size than 61% of those models.
What does the Kenmore 405.4227## cost to run per year?
The Kenmore 405.4227## holds rank #174 of 388 on running cost, at about $20 a year, an unremarkable but typical figure for the class. Efficiency-wise, once size is accounted for, it edges out 61% of the class, a modestly above-average showing. Its IMEF of 2.76 reflects integrated modified energy factor, one of the class's core efficiency levers.
Immediately around it on the leaderboard, the Fulgor Milano FM4WM24W1 at $20/yr runs a little cheaper and the Kenmore 4120# 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 Kenmore 405.4227##'s $20/yr adds up to roughly $200 in electricity alone, before purchase price or repairs.
Also sold as: Black+Decker BFLW45M.
By the numbers
The Kenmore 405.4227## 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 Kenmore 405.4227## adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Kenmore 405.4227## 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 Kenmore 405.4227## 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 4.6 cu ft, the Kenmore 405.4227## 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, neither the size advantage of a small unit nor the size penalty of a large one applies here, so its running cost is a fairer test of efficiency alone. Its IMEF of 2.76, 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 Kenmore 405.4227## cheap to run?
Roughly, yes. Its $20/yr figure is close to the class median, ranking #174 of 388, neither a bargain nor a splurge on running cost.
How much does the Kenmore 405.4227## cost per month?
About $1.7 a month, which is the $20 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: 110 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $20 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Kenmore 405.4227## for its size?
61st percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 186 | Fulgor Milano FM4WM24W12.2 cu ft | $20 |
| 185 | Finlux WM3228SCH2.2 cu ft | $20 |
| 184 | Finlux WM3225WCH2.2 cu ft | $20 |
| 183 | Finlux WM3225DICH2.2 cu ft | $20 |
| 182 | Finlux WM3220WSB2.2 cu ft | $20 |
Source
ES_15649_405.4227##_121620240352240_2384643View certified washing machine listingsENERGY STAR data as of July 2026Kenmore and 405.4227## 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.