A dehumidifier pulls the damp out of the air, and in a British home that is no small thing: it stops condensation running down the windows, keeps mould off the walls, protects furniture and books, and dries laundry indoors in a fraction of the time. An extensive test of 34 dehumidifiers sorted the best, and these are the top picks, checked against current UK prices.
What to Look For
Extraction rate and room size. The headline figure is how much water a dehumidifier pulls from the air per day, quoted in litres: compact models manage around 8L a day, while the biggest reach 20L or 25L for large or very damp rooms. Manufacturers also state a room size — anything from about 40 m² to 70 m² — but as a rule, buy more capacity than you think you need. Note that the rated figure is optimistic: a unit quoted at 14 litres per day, or 0.59 litres per hour, might deliver nearer 0.19 litres per hour — about 4.6 litres per day — in a cooler real-world room.
Running costs and noise. A dehumidifier may run for hours, so energy use matters: the best sip as little as 258 watts, while thirstier models draw up to 650 watts. Noise is just as important in a home — quiet units hum at around 38 to 45 decibels, whereas louder ones reach 60 decibels, enough to intrude in a bedroom.
Tank, drainage and controls. A bigger water tank — from around 1.4 to 2.5 litres — means fewer trips to empty it, and a continuous-drain hose option lets you run the machine unattended into a sink — some can even extend the built-in tank to 10 litres. The most efficient units draw as little as 8 watts on standby. Look for a humidistat that switches the unit off at your chosen humidity, plus a laundry mode for drying clothes.
Extras worth having. The best models add genuinely useful features: a HEPA air filter that cleans as it dries, app and even voice control, and smart modes that use weather data to run only when needed. These lift a basic dehumidifier into an all-round air-care appliance.
The Winner: Bosch Dry 4000
The Bosch Dry 4000 (around £219) is the best for most people, and its appeal is its simplicity. There are just three basic settings, lightly adjustable, and then it quietly gets on with the job — effectively, economically and with pleasingly little noise. It is rated for rooms up to 33 m², is especially easy to use, and can take an optional air filter. The only real omission is a timer. For a fuss-free, efficient dehumidifier that anyone can operate, it leads the field. Check the price on Amazon
Best for Large Rooms: MeacoDry Arete Two 25L
The MeacoDry Arete Two 25L (no buybox price at our latest check) is the pick for big or very damp spaces, pulling up to 25 litres of water a day. It is not just powerful but very economical and very quiet, and it comes loaded: a HEPA H13 air filter cleans the air as it dries it, and app plus voice control let it run automatically, even using weather data to switch on when humidity climbs. It is the do-everything choice for a whole house. Check the price on Amazon
Best All-Rounder: MeacoDry Arete One 20L
The MeacoDry Arete One 20L (£259.99) proves that raw power is not everything. It is not a thirsty machine, yet it dehumidified impressively in testing while being extremely economical to run, and it doubles as a HEPA air purifier for year-round use. The controls are not the most intuitive, but the results and running costs are hard to beat, making it a superb all-rounder for a typical home. Check the price on Amazon
Also Tested
The Trotec TTK 66 E is a solid mid-range option. It is not top of the class, but nor does it need top-of-the-class money: it offers no special highlights and no real weaknesses, doing a dependable job at a sensible price. Its one downside is that it runs a little loud. UK availability can be patchy, so check current stock before ordering.
How to Choose
Match the machine to your damp problem. For most homes, the quiet, efficient, dead-simple Bosch Dry 4000 is all you need. If you are fighting serious damp across a large house, the 25-litre MeacoDry Arete Two is the powerhouse, while the Arete One 20L is the clever all-rounder that also purifies the air. Size the extraction rate to your room, prioritise low running costs and quiet operation if it will run overnight, and look for a humidistat and continuous-drain option so it can work unattended. Remember, too, that most of these are refrigerant models best suited to warmer rooms; for a cold garage or utility space, a desiccant type copes better with low temperatures, its granulate absorbing around 1.4 litres of water per kilogram.
Verdict
The Bosch Dry 4000 is the dehumidifier to buy for most people at around £219: quiet, economical, effective and beautifully simple. For a large or damp house, step up to the 25-litre MeacoDry Arete Two (no buybox price at our latest check) with its HEPA filter and smart control, or choose the all-rounder MeacoDry Arete One 20L (£259.99) that purifies as it dries. Get the capacity right and a dehumidifier will transform a damp home.
Frequently asked questions
Will a dehumidifier stop mould? It attacks the cause. Mould needs moisture, and the test's benchmark is clear: comfortable indoor humidity sits between 40 and 60 per cent. Once condensation stops merely beading on window glass — which cannot mould — and starts running down onto frames and walls, humidity is too high and needs bringing down. The winning Bosch Dry 4000 (£219.00) is the pick for most homes with that problem.
Do those cheap moisture-absorber tubs actually work? Barely, on the test's own measurements. A kilogram of granulate binds roughly 1.4 litres of water over about three months — around 0.015 litres a day — while even the simplest electric dehumidifier managed three times that in the same period, and the granulate showed no measurable effect in the same room. Buy the electric machine.
Which dehumidifier is best for drying laundry indoors? Any of the picks handles it, and indoor drying is one of the classic causes the test names — alongside unheated cellars, unventilated bathrooms, aquariums and lots of houseplants — of humidity that ventilation alone can no longer fix. The MeacoDry Arete One 20L (£259.99) adds HEPA filtration for the same job.
How does a dehumidifier actually work? The larger machines use a refrigeration circuit exactly like a fridge: a compressor pushes coolant through narrow pipes, the resulting pressure liquefies it, and moisture in the air condenses on the cold surfaces and drips into the tank. The granulate alternative works chemically instead — a salt binds water (adsorption) and dissolves as it does, which is why the process cannot be controlled or hurried.
