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Different dehumidifiers and their benefits

Stadler form dehumidifier albert little

Different types of dehumidifiers


There are 4 types of dehumidifiers available in the UK today: refrigerant dehumidifiers, desiccant dehumidifiers, Peltier and rechargeable dehumidifiers. Which would be best for your application? We hope that you will soon be able to choose.

Refrigeration dehumidifiers

Refrigerant dehumidifiers are by far the most popular in the UK. They pull air through a filter and this passes over the cooling coils, much like refrigerator coils. The coils are very cold and the water condenses out of the air and drips into integral containers (most of the units can be equipped with a permanent drain hose). The air is then heated to room temperature and blown back out of the dehumidifier.

One of the downsides of this type of dehumidifier is the amount of noise they can make, as they work in a similar way to fridges they tend to make the same noises as fridges do and some people find this constant humming a problem, although it will depend where the unit is being used.

On the positive side, refrigerant dehumidifiers tend to be the cheapest on the market and are very strong. Some dryer’s construction production rates can be very high.

Desiccant dryers

Desiccant dehumidifiers do not have a compressor or refrigerant gas. They absorb water from the air with a desiccant material through slow wheel rotation slowly whereby the wheel spins past the heater, and the water evaporates in a container (or the water may be removed from the hose). The inside can be heated to 10 ° C above that of the room temperature and this is then placed back into the room.

Desiccant dehumidifiers extract the same amount of water regardless of the temperature of the air, making them ideal elements in cold areas such as for the protection of garages, sheds, trailers. Also, they won’t lose power in the cold; they are very light and very quiet.

Desiccant dehumidifiers negative aspects are that they are generally more expensive than other refrigeration dehumidifiers, but, as a rule, they are of very good quality. The extraction rate is usually not very high, probably about 7 litres per day, which means that a 1-2 bedroom flat / house will require one unit, although there are many models on the market and you can buy larger units for larger spaces.

Rechargeable Dehumidifiers

These tend to be small dehumidifiers used to keep smaller areas free of condensation, damp, mould and mildew. You can purchase desiccant dehumidifier bags which can be used in areas such as cupboards, drawers, wardrobes, boats and caravans. These bags can be left in the area to be treated and once the indicator changes to show they are full they can be places in a microwave to be recharged. These units are cheap to buy and have no running costs so are very economical.

As well as bags these types of units are also available as plastic dehumidifier units which collect water in the bottom of them and as dehumidifier eggs, as with the bags all of these can be easily recharged in a microwave.


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