Desiccant Dehumidifier Vs Compressor Dehumidifier

Dehumidifier Extraction Curve

When is 170 Litres less than 45 Litres?  When we consider rated performance of compressor dehumidifiers over desiccant dehumidifiers.

There is often an issue where people question why to buy a desiccant dehumidifier that has a much lower quoted extraction rate over a compressor dehumidifier that are it seems cheaper in comparison.

The answer is of course that they are often being used in a different applications or even being used together but that is rare.  The desiccant units are used typically below 17°C where they outperform dehumidifiers often rated much higher but that does not give the full picture.  A compressor dehumidifier will extract more water at higher temperatures but their performance at near 2°C/36°F point is minimal.  Often they will safety cut out at this temperature to stop frost damage at 5°C/41°F.  Cheaper models in the market may not stop even if they are literally a ball of ice.

Of course condensed water can freeze if the temperature is low enough and that frozen water expands.  The compressor dehumidifier will certainly stop extracting water at just above freezing but more importantly, when the frozen water inside the compressor dehumidifier expands it can damage internal components, even the fan, meaning a costly repair.  ( N.B. Frost also affects any desiccant dehumidifier that condenses the water into a water container).

Ecor Pro desiccant dehumidifiers will carry on extracting water down to -20°C/-4°F.

To see more on the Ecor Pro desiccant range see here


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