A dehumidifier pulls moisture out of the air to reduce damp, condensation and mould, and to help washing dry indoors. Choosing one comes down to three things: size, type and features.
Size (litres per day): this is how much water the unit can remove in a day under test conditions. Bigger is not always better, as an oversized unit costs more to buy and run. As a rough guide, a 10 to 12 litre unit suits a single damp room or a small flat, and 20 litres or more suits a larger home or lots of indoor drying. Real-world results vary with temperature and humidity.
Type: compressor models work well in warm, damp rooms and are the usual choice for UK homes. Desiccant models cope better in cold rooms such as garages and unheated spaces, but are generally less efficient in a warm room.
| Feature | Why it matters |
|---|---|
| Humidity sensor / humidistat | Switches the unit on and off to hold a set humidity, so it doesn't run all day |
| Continuous drain hose | Lets it empty into a sink or drain without you emptying the tank |
| Tank size | A bigger tank means fewer trips to empty it |
| Noise | Matters in a bedroom, so check reviews |
| Washing mode | Some models boost drying for laundry |
Tip: keep doors and windows closed while it runs, and aim for around 40% to 60% humidity indoors, which is the range commonly recommended to limit damp and mould.
Below are well-reviewed examples at each size. We haven't tested them ourselves. This comparison is based on the Amazon listings and customer ratings, so check the latest price and details before you buy.
1. About 12L: Pro Breeze 12L
A 4.6 rating from more than 5,000 buyers, one of the most reviewed models in our dehumidifier guide. A good size for one damp room.
Check Price on AmazonAlso consider: Pro Breeze OmniDry 12L/Day Dehumidifier — £130 (4.6★, 4,809 reviews)
Compare more in our Best Premium Dehumidifiers UK 2026 guide →
2. About 16L: KNKA 16L
A mid-size model with a 4.4 rating from nearly 2,000 buyers, for a bigger room or a flat.
Check Price on Amazon3. About 25L: AEOCKY 25L Compressor
A 4.7 rating from more than 1,100 buyers. The listing mentions laundry drying, and the larger capacity suits big washes and larger homes.
Check Price on AmazonCompare more in our Best Premium Dehumidifiers UK 2026 guide →
4. Small spaces: NETTA 500ml mini
A compact, low-cost unit with a 4.3 rating from more than 1,000 buyers. It removes far less moisture than the models above, so it suits wardrobes, bathrooms or very small rooms.
Check Price on AmazonAlso consider: EasyAcc 1200ml Electric Dehumidifier — £38 (4.3★, 3,485 reviews)