Model
Black+Decker BDT08TW
Rank #17 means 16 of the 519 dehumidifier models we track cost less to run each year; the 4th efficiency percentile means it uses less energy for its size than 4% of those models.
What does the Black+Decker BDT08TW cost to run per year?
Few dehumidifier models we track undercut the Black+Decker BDT08TW on cost; at about $22 a year it holds rank #17 of 519. Normalized for capacity, it beats only 4% of dehumidifier models we track, the weakest tier this efficiency ranking produces. Its IEF of 1.73 reflects integrated energy factor, one of the class's core efficiency levers.
Immediately around it on the leaderboard, the Humilabs OL12-D023F at $20/yr runs a little cheaper and the Kesnos CTH30B at $22/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A dehumidifier typically stays in service for somewhere around 8 years; over that span, the Black+Decker BDT08TW's $22/yr adds up to roughly $176 in electricity alone, before purchase price or repairs.
Also sold as: Kesnos CTH30B, Kesnos CTH30E, Waykar CTH30A, Waykar CTH30D.
By the numbers
The Black+Decker BDT08TW 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 Black+Decker BDT08TW adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Black+Decker BDT08TW costs about $220. That is roughly $420 less than the class median, which would run closer to $640 over the same ten years.
How the Black+Decker BDT08TW compares
The dehumidifier class we track runs from $19 to $521 a year. At $22/yr, it runs about $42 a year cheaper than the class median of $64, and it is about $3 a year more than the cheapest dehumidifier to run at $19.
What drives its running cost
At 9.2 pints/day, the Black+Decker BDT08TW is a small dehumidifier for its class, which spans 1.91 to 172.13 pints/day with a median of 32.46 pints/day, and smaller dehumidifier models generally cost less to run for the same job, all else being equal. The IEF of 1.73 on this model, below the class median of 2.01, measures integrated energy factor; it is the number to compare directly against another model's IEF if capacity is similar.
- Integrated Energy Factor (IEF). Two dehumidifiers rated for the same pints per day can carry very different IEF figures, and IEF is what actually separates their running costs.
- Water removal capacity (pints/day). Pints-per-day rating scales with the space it is built for, and that rating is the first driver of how much power the compressor needs.
- Humidistat accuracy. How tightly a humidistat holds its target humidity determines how much of the day the compressor actually runs, on top of the unit's rated capacity and IEF.
Common questions
Is the Black+Decker BDT08TW cheap to run?
Yes, relatively. At $22 a year it ranks #17 of 519 dehumidifier models we track, in the cheaper part of its class to run.
How much does the Black+Decker BDT08TW cost per month?
Roughly $1.81/mo, spreading the $22/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 117 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $22 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Black+Decker BDT08TW for its size?
4th 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
Source
ES_1126481_BDT08TW_05142025154051_7449609View certified dehumidifier listingsENERGY STAR data as of July 2026Black+Decker and BDT08TW 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.