The NETTA 20L is the heavy-duty sibling of the popular NETTA 12L: a 20 litre a day compressor dehumidifier with a 345 W motor, touch controls and a sleep mode, built for laundry and for larger damp rooms.
Availability: Amazon.co.uk from £214.96 (price checked )
Check price on Amazon.co.uk — £214.96The heavy-duty model: a 345 W motor, a 4.5 litre tank, touch controls and a sleep mode.
| Version | Capacity | Coverage | Noise level | Price |
|---|---|---|---|---|
| 12L | 12 L/day | Small to medium rooms | Below 55 dB(A) | £119.17 |
| 20L | 20 L/day | Medium to large rooms | Not stated (sleep mode quietens the fan) | £214.96 |
Verdict by James Whitfield, editor
20 L/day
Extraction rate
4.5 L
Water tank
345 W
Power
£214.96
Price
Choose it if
You want an efficient 20 litre unit with touch controls and a sleep mode for laundry or a larger damp room.
Skip it if
You want a hands-free drain hose, a long guarantee or the most proven reliability.
The extraction rate suits medium to large rooms, while the compact motor keeps the cost per hour moderate.
Set the target humidity from the top panel and watch the room level fall on the display.
The fan drops to a quieter setting, which makes the machine usable in a bedroom before bed.
The display shows FL and the machine stops itself, so it cannot overflow.
A real-life example. Picture a flat where the washing hangs in the living room every winter. You close the door, set the target to 40% and the machine dries two loads over the day before stopping itself.
The 20 litres a day is the manufacturer's rating under test conditions. In a cooler room the real figure is lower, so size up if the space is cold.
The 345 W figure is the power at full output. The humidistat switches the machine off at the target level, so the real cost is lower than running it flat out.
The manufacturer rates it at 345 W. That is a ceiling: the unit does not draw that power all the time, so the real cost is often lower. Indicative estimate over 30 days.
| Running time per day | kWh per month | Cost per month |
|---|---|---|
| 2 h | 20.7 kWh | £5.07 |
| 4 h | 41.4 kWh | £10.14 |
| 8 h | 82.8 kWh | £20.29 |
Work it out with your own tariff
Result: about £10.14 a month (41.4 kWh).
Worked example. At 345 W, 4 hours a day for 30 days is 41.4 kWh, about £10.14 at the reference price of 24.5p per kWh.
Choose it over the NETTA 12L if the room is larger or you dry washing every week. Choose the Pro Breeze 20L Compressor if you want a drain hose and a bigger tank.
Buy the NETTA 20L if you want an efficient 20 litre dehumidifier with simple touch controls and a sleep mode for laundry or a damp living room, and you accept a plainer build and a mixed reliability record. If you want a drain hose and a Which? Best Buy listing, the Pro Breeze 20L Compressor is the better fit. For a smaller room, the NETTA 12L costs less.
Check price on Amazon.co.uk — £214.96To dry washing, close the door of a small room, place the airer in the middle and set the target humidity to about 40%. The machine stops itself when it reaches the level, and the display shows the figure falling as the clothes dry. Two or three loads will usually be dry over a day in a small room, and very thick items take noticeably longer, so turn them over.
In a living room or hallway, set the target to 50-55% and let the machine cycle. For a bedroom, use the sleep mode, which quietens the fan a fair bit, and run the machine before bed, then let it switch off at the target level.
Remove the tank carefully when it is full. Line it up with the grooves, hold it at an angle and slide it in; the water fills close to the top, so carry it level to avoid spilling. If the display shows FL, the tank is full and the machine has paused until you empty it.
Leave at least 20 cm of free space around the grille so the airflow is not restricted, and keep the unit on a level floor. For damp walls and condensation, put it in the dampest room with the door closed and open a window briefly once a day.
Wash the dust filter under the tap every few weeks and let it dry before refitting. Like every compressor unit, the NETTA loses efficiency as the room cools, so for a cold garage or outbuilding choose a desiccant model such as the EcoAir DD3 Classic MK3.
NETTA is a UK homeware brand that built its dehumidifier range on low prices, and the 20 litre model is the step up from its best-selling 12 litre unit. It is a compressor dehumidifier rated to extract up to 20 litres of water a day, using 345 W of power, which keeps the running cost moderate for the capacity.
The controls are simple. Touch buttons on top set the target humidity, switch between modes and call up the sleep mode, and the current room humidity is shown on the display so you can watch it fall. When the tank is full the display shows FL and the machine cuts out by itself. The 4.5 litre tank is large enough for a few loads of washing before it needs emptying.
The weak points are practical. The tank slides into grooves and can be awkward to take out and refit until you learn to line it up and tilt it. NETTA's reliability record is mixed across the range, so it is worth keeping your receipt and registering the guarantee. There is no Wi-Fi, and the finish is plainer than Meaco or Bosch.
It suits households that want to cut down on tumble dryer use, owners of a damp living room or a ground-floor flat, and anyone who has outgrown a 12 litre unit. It is less suited to a very cold garage, where a desiccant unit works better, or to buyers who want a long guarantee and a premium build.
If you want a larger tank, a drain hose and a Which? Best Buy listing, the Pro Breeze 20L Compressor is the better-equipped 20 litre alternative.
The NETTA 20L is strongest on the combination of capacity, efficiency and simplicity: 20 litres a day from a 345 W motor, with touch controls and a sleep mode, in a compact body. The cost is a fiddly tank, a mixed reliability record across the brand and a plainer finish than Meaco or Bosch.
Our detailed scoring
Compared against other 16-20L-class units
Scoring calculated from the manufacturer's official specs, compared against the real range for this type of appliance — a scale specific to each metric, not this site's catalogue.
Price checked on . It changes quickly, so confirm the final price with the seller.
NETTA 20L Dehumidifier
20 litres/day
Amazon.co.uk from £214.96
Check the seller, delivery date and returns terms before ordering. Affiliate links: we earn a commission if you buy, at no extra cost to you.
A low-energy 12 litre compressor dehumidifier with a humidistat, timer and drain tube at a budget price, best for a hallway, bathroom or box room where capacity and running cost matter more than silence.
A well-equipped 20 litre compressor dehumidifier with a big tank, a carbon filter and a Which? Best Buy listing, best for a living room, utility room or damp family home where capacity and value matter more than silence.
| NETTA 20L DehumidifierTHIS REVIEW 4.4/5 £214.96 | NETTA 12L Dehumidifier 4.4/5 £119.17 | Pro Breeze 20L/Day Compressor Dehumidifier (PB-D-23) 4.5/5 £226.43 | |
|---|---|---|---|
| Extraction power | 20 litres/day | 12 litres/day | 20 litres/day |
| Noise level | — | Below 55 dB(A) | — |
| Tank capacity | 4.5 litres, auto shut-off when full | 1.5 litres | 5.5 litres, auto shut-off when full |
| Value for money | 4.4/5 (£214.96) | 4.4/5 (£119.17) | 4.5/5 (£226.43) |
| Check price on Amazon | Read the review | Read the review |
Specifications as stated by the manufacturer and seller. Check the exact details on the Amazon.co.uk listing before buying.
Check the seller, delivery date and returns terms on the Amazon.co.uk listing, because some offers are fulfilled by third parties. Prices were last checked on 18 October 2026 and change often, so confirm the final price before ordering. Capacity figures are quoted by manufacturers under test conditions (usually 30°C and 80% humidity), so expect less in a typical UK room.
To compare it with other models, see our Best Dehumidifier UK, Best Large Dehumidifier UK (20L+) and Best Dehumidifier for Drying Clothes guides.
Strengths
Weaknesses
Our verdict: The cheapest way into a 12 litre compressor unit with a proper humidistat, best for a small room, hallway or bathroom.
Strengths
Weaknesses
Our verdict: The step up from the 12L when the room is larger or the washing load is heavy. Choose the Pro Breeze 20L Compressor instead if you want a drain hose.
At 345 W it uses 0.345 kWh each hour at full output. At a typical unit rate of 26 to 35p per kWh that is roughly 9 to 12p an hour, and the humidistat means it does not run flat out all day. Use the running-cost calculator on this page to see the figure at your own tariff.
Use the sleep mode, which lowers the fan speed noticeably. A 20 litre compressor is never silent, so run it before bed and let it switch off at the target level. For quieter running, look at the Meaco Arete One 20L.
Choose the NETTA 12L for a bedroom, bathroom or hallway. Choose the 20L for a larger room, a family that dries washing indoors, or a damp ground-floor flat. The 20L has the bigger 4.5 litre tank and extracts more per day.
Set the target humidity to about 40%, close the door and run it in a small room. Two or three loads will normally dry over a day, with thick items taking longer. It costs less than a tumble dryer for the same load.
It can be fiddly at first. Line the tank up with the grooves, hold it at an angle and slide it in or out, and carry it level when full to avoid spilling. The machine pauses and shows FL when the tank is full.
The listing does not describe a continuous drain hose for this model, so plan to empty the 4.5 litre tank during heavy use. If you need hands-free drainage, the Pro Breeze 20L Compressor includes a hose.
A compressor dehumidifier loses efficiency as the room cools. It works well in lived-in rooms, but for an unheated garage, shed or caravan a desiccant unit is the better tool.
NETTA sells many units in the UK at low prices, but reliability across the range is mixed, so keep your proof of purchase and register the guarantee. If a long guarantee is important, consider a Meaco or Bosch model.
Written by
Priya Shah
Priya writes the product reviews and buying guides on this site. She cross-checks manufacturer specifications against independent sources such as Which? and GOV.UK, flagging any gap between what a brand claims and what the figures show.
About our team →26 dehumidifiers compared · Amazon.co.uk prices checked October 2026
NETTA 20L Dehumidifier
£214.96