Dehumidifier Buying Guide UK: Type, Size, Controls and Models Checked

Start with the room and the reason

Write down what the dehumidifier is for before you compare models: condensation on bedroom windows, a damp utility room, wet washing, or a cold garage. They need different things. A bedroom wants quiet running and a humidity target you can set, laundry wants a mode that keeps the fan fast for hours, and an unheated outbuilding wants a unit rated for low temperatures.

Check the cause as well. A dehumidifier lowers the moisture in the air but does not mend a leak, replace a broken extractor fan or warm a cold wall, and government guidance says that dealing with surface mould alone will not stop it returning. Our guides on condensation and on drying laundry indoors cover those two jobs in more depth.

Compressor or desiccant

A compressor (refrigerant) model cools the air over a cold surface so that water condenses into the tank. A desiccant model uses an absorbent wheel that is heated to release the moisture. Which? says refrigerant models typically struggle in colder spaces and desiccant models work in both warm and cold ones, and that for an unheated garage, conservatory or outbuilding you should generally choose a desiccant. Electrical Safety First says compressors work best and are generally more energy efficient in warmer temperatures, and that desiccant types may use more energy overall. Which? agrees that desiccant models are more expensive to run.

The makers’ limits show the difference in practice. EcoAir rates the DD1 Simple MK3 from 1°C, while the compressors here print 3°C, 5°C or, for the DC12 MK3, 15°C. EcoAir’s manual says the DC12 MK3 defrosts periodically below 15°C, and Pro Breeze’s manual warns that the coils may freeze below 5°C. Our comparison of the two types goes through the trade-offs.

Litres per day, and why two 12 L ratings can differ

A rating is the water removed in 24 hours in a stated test room. The Meaco Arete One 12L, the Pro Breeze PB-18 (in its manual) and the EcoAir DC12 MK3 all print 12 L at 30°C and 80% RH, a hot and very humid room. EcoAir’s DD1 Simple MK3 prints 7.5 L at 20°C and 60% RH, a mild one. Meaco prints both kinds of condition for the Arete One: 12 L at 30°C and 80% RH but 7.5 L at 27°C and 60% RH. Ebac and Pro Breeze’s 20L Smart print a figure with no conditions, or none at all, so it cannot be compared with these.

Ebac argues the opposite case on its own website: that quoted extraction rates can mislead because they refer to conditions not found in the UK, and that a unit with adaptive control suits a home better than a large one. That is the view of a company that sells adaptive control, and we have not tested it. The fair reading is that a rating helps you choose between sizes only when the conditions are printed and match.

What size dehumidifier do I need?

Which? says capacity is the litres a unit can remove each day, which is different from the tank, and that the right size depends on the size of the space, how many people create moisture through cooking, washing and drying laundry, and how bad the damp is. It puts 7 to 12 L in a small band, for a single person in a small flat with a mild problem, 14 to 16 L in a medium band for more people or a worse problem, and 18 L or more in a large band, for a lot of moisture or laundry dried indoors.

Rated room sizes are sales claims and not measurements. Pro Breeze says up to 20 m² for the PB-18, Ebac gives home sizes of 225 m² for the 3850e and 180 m² for the 2650e, and Amazon’s own model row for the Meaco lists 50 m². A humidity reader (hygrometer) is a better guide than a floor area: makers describe comfortable humidity as roughly 40% to 60% RH, and Meaco’s manual suggests a target of about 55%. A unit that is too small for the moisture it faces runs continuously and fills its tank, and the answer then is to reduce the moisture, not only to buy a bigger machine.

Humidistats and controls

Which? says a humidistat monitors the moisture in the air and adjusts the machine to hold the level you set, and that some models also have a more nuanced auto setting. Ranges differ. The Meaco Arete One sets 40% to 70% RH, the Pro Breeze PB-18 and EcoAir DC12 MK3 30% to 80%, the DD1 Simple uses a dial, and Ebac’s Smart Control prints no target range. Meaco’s continuous (CO) setting never switches off whatever the humidity.

Auto-restart after a power cut is listed by Meaco, EcoAir and NETTA, and timers range from an off timer to a 24-hour programme. Which? points out that a timer can save money on a tariff with cheaper hours, and says it tests how accurate each humidistat is, which Shopicks cannot see because the results are behind a paywall.

Water tanks and drainage

The tank holds the water and the rating describes how fast it arrives. The tanks in our listing run from 1.5 L to 4 L and do not follow the ratings: Ebac’s 2650e has a 3.5 L tank while its 3850e, listed with the larger capacity, has 2.5 L. When the tank is full the unit stops, so a small tank on a hard-working machine in a damp room needs emptying often.

Continuous drainage avoids that. Which? says you often have to buy the hose separately, and the makers differ: Pro Breeze and EcoAir’s DC12 MK3 list hoses in the box, Meaco lists an adaptor for a garden hose, and Ebac sells permanent drainage as an extra. The hose must run downhill without kinks, and both EcoAir’s and Pro Breeze’s manuals say not to leave the end of a hose outside when the temperature is below 1°C.

Laundry use

Which? says you can use any dehumidifier to dry laundry, with the target set to 30% to 40% if there is no laundry setting, and in its test a dehumidifier almost halved the drying time of two identical loads. Laundry modes differ: Meaco’s Arete One targets 35% RH on high fan for 6 hours, while EcoAir’s DC12 MK3 manual says not to use its laundry mode for long periods or unattended. Our guide on drying clothes with a dehumidifier covers set-up, placement and safety.

Noise

Every noise figure in this guide is printed without measurement conditions, and some are a single ‘from’ value. Meaco’s ABC 10L page says ‘from 36 dB’ while its manual says ‘maximum 40 dB(A)’ at one metre, and EcoAir prints 34/47 dB(A) for the DD1 Simple without saying which setting each belongs to. Meaco’s manual says removing the HEPA filter lowers the noise by 4 to 5 dB. Which? rates quietness subjectively on the highest and lowest settings in its lab, and we do not call any model the quietest.

Where you put it matters too. Meaco’s manual for the DD8L Pro says a dehumidifier will be noisier on wooden floors than on carpet, and Which? suggests a night or silent mode if you will run it while you sleep.

Storage, maintenance and safety

Cleaning the filter is the most common instruction: Meaco, Pro Breeze and EcoAir all say to clean it at least every two weeks, Meaco says a HEPA filter needs replacing roughly every 3 months, and EcoAir says to replace its outer filter about every 6 months. Which? says to vacuum the room before using a dehumidifier, empty the tank after use and wipe it to avoid mould, and that manufacturers tell it a blocked filter is a very common reason for a unit not working. Keep a compressor upright: Meaco asks you to leave it standing for six hours before first use, and EcoAir asks for four hours.

Electrical Safety First says to buy from a reputable retailer or directly from a known maker rather than a third-party online seller, whose unverified products may not meet UK safety standards, so check who sells the item on Amazon.co.uk before you order. It also says to avoid second-hand units, look for UKCA or CE marks, register the product for recall notices and use a socket with RCD protection. It also advises against running a dehumidifier overnight or while you are away unless the maker says that is safe. Several manuals say the R290 refrigerant is flammable and ask you to keep the unit away from ignition sources.

What manufacturer claims can and cannot tell you

A maker’s page and manual can tell you the model, the tank size, the temperature range, the clearance it needs, the warranty and how to use the controls. They cannot tell you how the machine will perform in your room, whether the noise suits your bedroom, or how it compares with a rival, because each maker chooses its own conditions. Listings also repeat lines such as an award, ‘quietest’ or ‘guaranteed to solve’ that Shopicks cannot check, and we do not repeat them.

Where claims conflict we say so: Pro Breeze’s page and manual differ on the 20L Smart’s operating range, Ebac’s Amazon.co.uk title says a two year warranty while its page says five years when bought direct, and Meaco’s water removal table disagrees with itself. Ask the maker for the test conditions behind any number that matters to you.