How to choose the right dehumidifier

Choosing a dehumidifier can be confusing. Let us guide you through the key things to consider.
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There are many factors to consider when deciding what dehumidifier to purchase. The 5 main considerations are...
Different types of dehumidifiers
Where the dehumidifier will be used
How much water needs to be removed
How to control the dehumidifier
Energy Efficiency

Different Types of Dehumidifier

There are two main types of dehumidifier. Compressor dehumidifiers and Desiccant dehumidifiers. Small Thermo electric dehumidifiers are of very limited benefit and usually can only cope with extremely small spaces such as a cupboard. Equally moisture absorbers only remove very small amounts of water.

Compressor dehumidifiers

  • Good extraction capacity to solve damp and condensation problems with lower running costs.
  • Use a compressor and a heat exchanger to remove moisture from the air.
  • These dehumidifiers are most suited to domestic applications such as houses.

Desiccant wheel dehumidifiers

  • Extract a large amount of water but have very high running costs.
  • At typical UK conditions in occupied UK homes they consume twice as much electricity per litre of water removed.
  • They are more suitable for unheated buildings where the temperature drops below 5°C.
  • These dehumidifiers are mostly used in industrial and construction projects where very large amounts of water need removed and running costs are not important.

Where the dehumidifier will be used?

Most domestic dehumidifiers are used to prevent condensation and dampness in an occupied home, however some people use them to protecting against dampness in an unoccupied space such as garages.

Condensation and dampness in an occupied home

Even though dampness or condensation may only be a problem in one part of your home, the source of this excess moisture will be come from a number of places.

The bathroom, kitchen and people generate the most moisture in the home.

Your entire house generates excess moisture and in most cases, the best solution is a compressor dehumidifier with an average extraction rate of around 18 litres.

If you have a particularly small home, with just one person, then lower capacity dehumidifiers with an extraction rate of 12 to 15 litres will be sufficient.

Protecting property in an unoccupied space

Items that are stored in garages or outbuildings need to have a dehumidifier to prevent deterioration, damage, dampness or mould.

The ideal Relative Humidity to prevent damage is below 50%.

If there is no heating in the space and the space is reasonably well sealed - any type of dehumidifier will be satisfactory providing it has a reliable humidistat.

How much water needs to be removed?

The main factor in determining the amount of moisture that needs to be removed is determined by the number of people living in the property and how much excess moisture they produce...
5 people who live a normal lifestyle will control condensation and the effects of dampness by using a dehumidifier rated 20 to 25 litre.
2 people will need to use a smaller extraction dehumidifier such as a 12 to 18 litre.
Ebac dehumidifiers have been optimised for the UK climate and as such will take out more water than other brands at UK conditions and will do so with lower running costs.
Number of people x1 x2 x3 x4 x5+
Equivalent Extraction Rate 12 litres 15 litres 18 litres 20 litres 25 litres
Moisture Created and Collected 1.5 litres 1.7 litres 2.5 litres 2.75 litres 3 litres

How do I control the dehumidifier

There are 3 main factors to consider when looking at the control of a dehumidifier
How to keep running costs low
Ensuring the right amount of moisture is removed to solve your problem fast
Ease of operation

Changing outside temperatures determine the optimum Relative Humidity (RH) setting for a dehumidifier. As the outside temperature changes frequently, a manually adjustable humidistat needs to be reset regularly – ideally every hour.

The optimum relative humidity to prevent problems could be anywhere between 50% and 35%.

If the settings on your dehumidifier are not adjusted to the optimum level - the dehumidifier could be off and not control condensation and dampness or alternatively be on for too long and waste electricity.

To provide accurate control, the humidistat should be adjustable in 1% steps to get the best performance. Some humidistats can only be adjusted in 5% steps. Such wide steps mean that the dehumidifier will not run enough or will run for too long.

An automatic control like Ebac’s Smart Control handles adjustments automatically.

Ebac’s Smart Control gathers data from the air in your house and automatically adjusts to match the current extraction needs rather than to control an unknown Relative Humidity (RH).

Ebac‘s Smart Control guarantees that the dehumidifier runs enough to prevent dampness and condensation but not too much, therefore it never wastes large amounts of electricity!

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