1byone 400ML Powerful Thermo-electric Dehumidifier – Best for Closets

1byone 400ML Powerful Thermo-electric Dehumidifier – Best for Closets

Dehumidifying is a simple concept at heart, and sometimes that concept doesn’t require a large unit to get the job done. If you need a small space to be drier and free of humidity, you don’t need to worry about purchasing a bigger unit like the ones mentioned above. In such cases, a unit like this one made by 1byone is more than capable of the task.

This unit takes up barely any space at all, and uses a low amount of power. The operation is the same as bigger units as far as using a reservoir tank and a blower fan. If you are dealing with isolated humidity issues in areas like closets, bathrooms, or other small spaces, this unit is a good place to start.

Notable Aspects

The obvious advantage here is the size. Standing at less than a foot tall, the unit can fit pretty much anywhere, and doesn’t need much room for intake or air exhaust. It weighs under 3 lbs, so moving it around from room to room is quick and easy.

Now, the size also limits the space you can use it in, and 1byone recommends that you keep it under 100 square feet. You are welcome to try it in larger spaces, but don’t expect flawless performance. When used as recommended, you can remove as much as 170 mL of air moisture each day.

The unit doesn’t use a compressor, but relies on Peltier technology instead. This means a more quiet and simple operation than bigger units — but not an entirely quiet operation. Still, it’s much quieter than a conventional unit.

The reservoir tank can hold up to 400 mL, which is impressive. In most cases, you won’t have to empty the tank more than once every few days. There is an auto shut-off built in that will power the unit down when the tank is full, so don’t worry about it slowly spilling over.

Negatives: Despite being very small, the unit still operates at a moderate volume, which is a bit disappointing. It’s not near as bad as larger units, but it’s definitely noticeable, so if you’re a light sleeper, you’re going to want to turn it off at night.


  • Very affordable
  • Simple operation
  • Auto shut-off
  • Low power use
  • Compact


  • Still a bit noisey
  • Only optimal for very small spaces

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As long as you know its limits, this unit from 1byone can be very useful for specific applications. Musky closets, bathrooms, and even small bedrooms will be well-served with this dehumidifier, without jacking up your electric bill. The large tank and auto shut-off feature seals the deal in making this a great option for a cheap unit that is still capable of decreasing humidity.