Damp walls, black mould in corners and a musty smell are common in UK homes from October onwards, when windows stay shut and cold walls collect condensation.
Prices checked on Amazon UK, 27 October 2026.
Damp walls, black mould in corners and a musty smell are common in UK homes from October onwards, when windows stay shut and cold walls collect condensation. A whole-room dehumidifier pulls that moisture out of the air, so less of it ends up on walls, window frames and furniture. For damp you need more than a mini plug-in unit: this guide focuses on 12 litre and 20 litre compressor dehumidifiers for most rooms, plus desiccant models that keep working in cold rooms, garages and unheated spaces. Extraction rates, tank sizes, noise and room sizes are taken from each Amazon UK listing. A dehumidifier deals with condensation and damp air; if the damp is coming from a leak, rising damp or a gutter, that source needs fixing too. We found 8 dehumidifiers for damp walls in stock on Amazon UK with a live buy-box price when we checked on 27 October 2026. Our overall pick is the Honeywell 12L/Day Dehumidifier with Digital Display at £119.99, the budget pick is the NETTA 12L Dehumidifier with Laundry Drying at £85.47, and our pick for a bigger home is the PureMate 20L/Day Dehumidifier with 6.5L Tank at £144.49. Prices and stock change often, so check both on Amazon before you buy.
Quick comparison
| Product | Price | Best for | Type | Extraction (listing) | Tank | Noise (listing) | Room size (listing) |
|---|---|---|---|---|---|---|---|
| Honeywell 12L/Day Dehumidifier with Digital Display | £119.99 | Low running cost claim | Compressor | Up to 12L/day | 2.5L | 40–42.5dB | – |
| NETTA 12L Dehumidifier with Laundry Drying | £85.47 | Budget 12L for one room | Compressor, 170W | Up to 12L/day | 1.5L | – | Up to 20m² |
| PureMate 20L/Day Dehumidifier with 6.5L Tank | £144.49 | Large tank, very damp homes | Compressor | Up to 20L/day | 6.5L | – | – |
| Devola 12L Dehumidifier with Carbon Filter | £101.98 | Carbon filter and timer | Compressor | 12L/day | 2.9L | – | – |
| MeacoDry ABC 12L Quiet Dehumidifier | £149.99 | Quiet, flats and smaller houses | Compressor | Up to 12L/day | – | 35dB | Flat or smaller house |
| Belaco 20L Dehumidifier for Home and Office | £109.98 | Cheapest 20L | Compressor | Up to 20L/day | 2.2L | – | Medium to large rooms |
| EasyAcc 5L/Day Desiccant Dehumidifier | £79.99 | Cold rooms on a budget | Desiccant | Up to 5L/day | 2L | – | Up to 30m² |
| EcoAir DD1 Simple MK3 Desiccant Dehumidifier | £179.99 | Cold rooms, bigger areas | Desiccant | 7.5L/day | 7L | 34dBA (quiet mode) | Up to 60m² |
Specs from each Amazon UK listing (– = not stated on the listing); prices checked on Amazon UK on 27 October 2026.
Our picks
Honeywell 12L/Day Dehumidifier with Digital Display
Honeywell 12L/Day Dehumidifier with Digital Display
£119.99
Best overall
NETTA 12L Dehumidifier with Laundry Drying
NETTA 12L Dehumidifier with Laundry Drying
£85.47
Best budget
PureMate 20L/Day Dehumidifier with 6.5L Tank
PureMate 20L/Day Dehumidifier with 6.5L Tank
£144.49
Best for families
How we pick
We shortlist products sold on Amazon UK using capacity, features, customer ratings and price band. We do not lab-test every model unless a page says so. The Amazon page is the live price. How we recommend.
Compare at a glance
| Product | Capacity | Last Amazon price | Buy |
|---|---|---|---|
| 12L |
£119.99
|
||
| 12L |
£85.47
|
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| 20L |
£144.49
|
||
| 12L |
£101.98
|
||
| 12L |
£149.99
|
||
| 20L |
£109.98
|
||
| 5L |
£79.99
|
||
|
£179.99
|
The products
Buying advice
Our top picks
Best overall: Honeywell 12L/Day Dehumidifier with Digital Display (£119.99). Honeywell's 12 litre model. The listing quotes about 5p an hour to run (based on 25p/kWh), noise from 40dB up to 42.5dB in laundry mode, four modes, a 24 hour timer, caster wheels and a 2.5 litre tank.
Best budget: NETTA 12L Dehumidifier with Laundry Drying (£85.47). A low-cost 12 litre compressor model. The listing says it suits rooms up to 20m², removes up to 12 litres a day, uses 170W and has a 1.5 litre tank with auto shut-off and caster wheels.
Best 20L model: PureMate 20L/Day Dehumidifier with 6.5L Tank (£144.49). The biggest tank in this guide at 6.5 litres, so it needs emptying less often on a very damp day. The listing says it removes up to 20 litres a day using a compressor, has a humidity sensor with a 3-light indicator, continuous drainage, laundry drying, a 24 hour timer and castor wheels.
Other dehumidifiers for damp worth a look
Devola 12L Dehumidifier with Carbon Filter (£101.98). A 12 litre compressor dehumidifier with laundry, night, manual and continuous modes. The listing lists 190m³/hr airflow, adjustable humidity, a 1 to 8 hour timer, child lock, a washable dust filter plus carbon filter, and a 2.9 litre tank.
MeacoDry ABC 12L Quiet Dehumidifier (£149.99). The quietest 12 litre model here by listing figures: it holds a Quiet Mark at 35dB. The listing quotes about 3p an hour (based on 24.5p/kWh), says it suits a flat or smaller house and helps prevent damp walls, damp smells and mould, and has a six-hour laundry mode.
Belaco 20L Dehumidifier for Home and Office (£109.98). A 20 litre compressor dehumidifier for medium to large rooms, basements and garages. The listing mentions a laundry mode, digital humidity display, adjustable humidity, auto shut-off and a continuous drainage option, with a 2.2 litre tank.
EasyAcc 5L/Day Desiccant Dehumidifier (£79.99). A desiccant (rotor wheel) dehumidifier. The listing says it removes up to 5 litres a day, covers rooms up to 30 square metres and works from -10°C to 50°C, so it suits cold rooms and garages where compressor units slow down. It has an air filter, continuous drainage and a 2 litre tank.
EcoAir DD1 Simple MK3 Desiccant Dehumidifier (£179.99). A long-running desiccant model with a simple rotary dial. The listing gives 7.5 litres a day, a super quiet mode at 34dBA, working temperature from 1°C to 40°C, floor areas up to 60m², a laundry mode, an anti-bacterial filter and a 6kg weight.
Compressor or desiccant for damp walls?
Compressor dehumidifiers such as the NETTA (£85.47), Honeywell (£119.99) or PureMate (£144.49) are the usual choice for heated living rooms and bedrooms. They collect the most water for the money in a warm room.
Desiccant dehumidifiers such as the EasyAcc (£79.99) and EcoAir DD1 (£179.99) collect less water per day on paper, but their listings say they work down to -10°C and 1°C respectively, so they suit cold bedrooms, conservatories, garages and unheated rooms where damp is often worst.
12L or 20L?
A 12 litre model suits one damp room or a small flat. If damp affects several rooms, or the house has been empty and unheated, a 20 litre model such as the Belaco (£109.98) or PureMate (£144.49) removes more water and can be connected to a drain hose so it runs without emptying.
For damp in a bathroom only, see our [bathroom dehumidifier guide](https://10deals.co.uk/posts/best-dehumidifier-for-bathroom-uk-2026); for a bedroom, see the [bedroom dehumidifier guide](https://10deals.co.uk/posts/best-dehumidifier-for-bedroom-uk-2026).
What to look for in a dehumidifier for damp walls
Extraction rate. Listed as litres per day, usually measured in warm, humid test conditions, so real-world collection in a cool UK room is lower.
Type. Compressor for heated rooms; desiccant for cold rooms and garages.
Tank size and drainage. A bigger tank or a continuous drain hose means less emptying.
Humidity control. A humidistat lets the unit switch off once the room reaches your target level, which saves electricity.
Noise. Only some listings quote a decibel figure; we show a dash where none is given.
Running cost. Work it out as the power in kW multiplied by hours used multiplied by your unit rate; listing pence-per-hour figures use the seller's own assumed rate.
How we chose these picks
We only included products that were in stock on Amazon UK with a single live buy-box price in pounds when we checked on 27 October 2026, read with a UK delivery address. We skipped listings showing low stock, no stock line or unclear details, and we avoided repeating products already featured in our other guides. Specs in the comparison table come from each product's Amazon UK listing, and a dash means the listing does not state that detail. Descriptions are based on what each listing says; we have not tested these products ourselves, and we have not used star ratings or review counts.
Prices were checked on Amazon UK on 27 October 2026 and can change at any time. Check the current price, details and delivery date on Amazon before you order.
Frequently asked questions
Will a dehumidifier dry out damp walls?
It can help surface damp and condensation dry out by lowering the humidity in the room, and it stops more moisture settling on cold walls. It will not fix damp caused by a leak, rising damp or penetrating damp from outside, which need the source repaired.
Can a dehumidifier make damp worse?
A dehumidifier removes water from the air rather than adding it, so it should not create damp. The risk is relying on it alone while a leak or other source of water goes unfixed.
Does a dehumidifier remove damp smell?
A musty smell usually comes from damp and mould, so lowering humidity helps it fade over time. Some models, like the Devola in this guide, also list a carbon filter. Mould that is already growing needs cleaning off separately.
How to use a dehumidifier for damp?
Close the windows and doors of the damp room, place the unit away from the wall so air can flow, and set the humidity target if it has one. Empty the tank regularly or fit a drain hose, and keep the filter clean as the listing instructs.
