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Dehumidifiers buying guide


If you’re on the lookout for a new dehumidifier, this handy guide will help you to find the right device for your purpose and budget.


If you’re on the lookout for a new dehumidifier, this handy guide will help you to find the right device for your purpose and budget.



Have you ever wondered what happens to the moisture from drying clothes indoors? Without a dehumidifier, it ends up in the walls, ceiling and floor creating future problems.


This is generated through everyday tasks like breathing, cooking, showering and cleaning. A dehumidifier prevents excess airborne moisture from settling and leaves a clean, dry environment.

Minor flooding

A dehumidifier is vital for saving your property from further damage after a small flood. This could include harm to books and electricals, as well as warped doors, ceilings, peeling wallpaper and corroded metal.


Most units come with an antibacterial/HEPA filter to capture contaminants like dust, dust mites and allergens, leaving behind fresh, filtered air.

Reduced costs

A dehumidifier makes your home feel warmer, allowing you to lower the thermostat and heat your home for less. If you wish to dry laundry with a dehumidifier, it costs between 2p and 7p per hour; versus a whopping 31p per hour to run a tumble dryer (2015 energy prices).



There are several advantages to using a desiccant dehumidifier. They operate quietly in temperatures between 1 and 30°C and can be used throughout the home in the bedroom, kitchen, bathroom and garage. We recommend:

Desiccant Dehumidifiers

• Capacity: 0.48L
• Drawers and Wardrobes


• Capacity: 6L
• Up to 4 bedrooms

SAVE 21%

• Capacity: 8L
• Up to 5 bedrooms


• Capacity: 8L
• Up to 5 Bedrooms

SAVE 25%


Compressor dehumidifiers are highly efficient at extracting excess moisture from heated properties and most effective between 10 and 15°C. We recommend:

Compressor Dehumidifiers

• Capacity: 10L
• 2-3 Bedrooms

SAVE 23%

• Capacity: 10L
• Up to 3 Bedrooms

SAVE 23%

• Capacity: 20L
• Up to 5 Bedrooms


• Capacity: 90L
• Large Areas

SAVE 14%


Enjoy great savings on utility bills (including heating) with a low energy dehumidifier. Some machines cost as little as 2p per hour to run, we recommend:

Low Energy Dehumidifiers

• Capacity: 12L
• Up to 3 Bedrooms

SAVE 11%

• Capacity: 12L
• Up to 3 Bedrooms


• Capacity: 20L
• 2-5 Bedrooms

SAVE 13%

• Capacity: 20L
• 2-5 Bedrooms



Our range of mini dehumidifiers are handy for protecting clothes, furnishings and furniture from unwanted moisture and mould. We recommend:

Mini Dehumidifiers

• Capacity: 500ML
• Caravans and Boats

SAVE 33%

• Capacity: 1.5L
• Caravans and Boats

SAVE 36%

• Capacity: 2L
• Caravans and Boats

SAVE 39%

• Capacity: 2L
• Caravans and Boats

SAVE 17%


Commercial dehumidifiers are ideal for large offices, factories and warehouses, where excessive moisture could damage infrastructure or goods. We recommend:

Commercial Dehumidifiers

• Capacity: 30L
• Large Areas

SAVE 28%

• Capacity: 45L
• Large Areas

SAVE 20%

• Capacity: 50L
• Commercial Areas


• Capacity: 60L
• Large Areas

SAVE 14%



Some dehumidifiers feature a laundry setting. This dries clothes quickly and uses less energy than a tumble dryer.


Enjoy complete control over humidity, energy usage and bills with the humidistat function of a dehumidifier..


Create schedules and monitor your space remotely through an app.


When the tank is full, some models automatically shut down to prevent overflowing.


Carbon and HEPA filters capture contaminants like dust, dust mites, mould spores and bacteria to control or relieve allergies and irritations.


If you wish to run a device continually, you will benefit from a built-in hose. This is more convenient than manually emptying the tank.


How do dehumidifiers work?

They reduce humidity in an enclosed space by extracting excess moisture from the air.

How often should I change the filters on my dehumidifiers?

Filters are easy to change but must be cleaned regularly to maintain optimum efficiency; please read your machine’s manual for specific details.

Do I need a dehumidifier?

If you often see condensation on windows and mould on walls, you probably need to use a dehumidifier. This moisture can damage wooden structures, as well as wallpaper and fabrics. Moisture typically condenses on the coldest surfaces, i.e. windows or walls in north or east-facing rooms, any rooms with external walls or unheated rooms.

What is relative humidity?

Relative humidity (RH) is the measure of water currently in the air versus how much water the air can hold. It is generally written as a percentage, and 100% RH (also known as ‘dew point’) will condense on any surface.

Where should I place my dehumidifier?

Position your device in the dampest room, then when it’s reached the desired humidity move it to the next space. When you’ve finished, place it in a central location with all room doors slightly open to capture the remaining moisture. We recommended leaving a six-inch gap between your dehumidifier and any walls or furniture.

Does the desiccant material in desiccant dehumidifiers need to be topped up / replaced?

No. The desiccant material neither expires nor requires topping up.

What is the ideal humidity level for my home?

50% RH is comfortable for most houses. This will protect properties and belongings from unwanted mould and moisture while controlling dust mites. Reducing humidity below 50% is unnecessary.

What is the best dehumidifier unit for drying laundry?

If drying washing in a warm room, use a powerful 20-litre compressor unit. If drying laundry in a kitchen, living room or spare bedroom, choose a desiccant machine; these units remove moisture and blow warm, dry air over washing – some even incorporate a laundry function.

What is the best dehumidifier unit for use in a motor home, caravan or boat?

A 7-litre desiccant machine is ideal because it works equally well in warm and cold conditions while running unattended for long periods. Most come with a tank as well as a hose for continuous drainage, plus auto-restart in the event of a power cut.

What is the best dehumidifier unit for a garage or cellar?

Garages tend to be unheated, making desiccant units ideal. They extract moisture whatever the temperature and can reduce humidity to 40% – below the rusting point of most metals.

Can a dehumidifier help control or relieve my allergy symptoms?

Yes they can, some of our dehumidifier are fitted with HEPA filters which can extract mould, dust and bacteria out of the air to help with allergies and irritations.

How much does a dehumidifier cost to run?

This all depends on the product. On our site we offer a range of low energy dehumidifiers ensuring it doesn’t cost you a fortune to run. Also do not forget they can reduce your heating bills!

How does a dehumidifier prevent mould and mildew?

Dehumidifiers remove excess moisture from the air, walls and floors, preventing moisture and bacteria from settling and breeding. Mould cannot grow below 60% RH, so set your dehumidifier to maintain 55% or less.

How do I stop mould from growing or mildew from forming?

Mould will not grow in humidity below 60% RH (Relative Humidity). By running a dehumidifier set to maintain humidity at 55% or lower so mould will not grow. Easy solution, buy a dehumidifier and keep mould at bay.

How do I know how big of a dehumidifier I need?

This depends on your room size and moisture level – we explain these for each machine on our website.

How long will it take to get the moisture under control?

Providing your dehumidifier is large enough for an area, and there is no damp problem, normal humidity should be achieved within one week. Please note, this may change if a room has been flooded, you may also require additional equipment from water damage specialists.

How much water does a dehumidifier remove?

This depends on the type and size of each dehumidifier. For example, the average 10-litre decompressor extracts 3 to 5 litres in 24 hours; while an 8-litre desiccant extracts 7 to 8 litres in the same conditions.

Can I use the water that collects in the bucket?

You may use this water in an iron or to water plants. However, it should not be consumed as it may contain substances that could make you or your pets ill.

What is Continuous Drainage?

All portable dehumidifiers have a water collection container, often called a tank or a bucket, to collect the water extracted from the air. These buckets are quite small, to keep the overall size of the dehumidifier down, and need to be emptied at least once a day. Because it may not be convenient, or possible, to empty the bucket daily almost all portable dehumidifiers for home use are designed to allow the water to be drained directly as it is collected. This is known as continuous drainage. In the casing of the dehumidifier a small hole has been cut to allow a small hose (most of our units come with this hose in the box) to be attached to the dehumidifier through which the water can be drained. The water is drained by gravity alone so for effective continuous drainage the dehumidifier needs to be raised a foot or two above the floor and the hose run to a floor level drain.

Are dehumidifiers expensive to run?

Most domestic dehumidifiers will consume between 180 and 660 watts per hour – this equates to between 2 and 7 pence per hour at 2015 domestic energy prices. Bear in mind that the drier the air, the quicker the air will warm up when your heating is on. Therefore during the winter months the running cost of your dehumidifier will tend to be more than offset by the saving on your heating bill.

Used correctly, dehumidifiers can be a much more economical option for drying laundry than a tumble dryer. The latest energy efficient tumble dryers use at least 2500 watts per 120 minute cycle compared to an average of 880 watts for a desiccant dehumidifier for the same amount of time.

Consider that a desiccant dehumidifier positioned next to or below a clothes maiden will not only draw the moisture from the clothes but also blow warm, dry air over your clothes, drying them quickly – and there is no chance of your clothes being damaged in the process.

Why does the dehumidifier extract less water than 10L that it’s rated?

For example a 10 litres manufacturer rated compressor dehumidifier will extract around 3-5 litres in normal domestic conditions in 24 hours depending of the relative humidity and temperature. A typical 8 litres desiccant will extract 7-8 litres in the same conditions being less sensitive to temperature variations. Once the dehumidifier is regularly used and the humidity has been reduced the amount of water removed daily will stay at a constant level.

Still have questions?

We know choosing a dehumidifier isn't an easy decision. Not sure what's best for you? We can take the guesswork out of decision-making. Call us at 0871 984 4416. We want to help make your indoors healthy and comfortable.

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