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Hi all we have been given a dehumidifier which was said to be in full working order, so we thought we would try it out in our van which has damp, but after 24 hours it had nothing in the tank.

if I put a bowl of water in the van will it extract it so that I can verify the dehumidifier is working?

I find it very strange that it hasnt extracted any moisture.

What sort is it?

For electic ones to work it must not be too cold or the moisture in the air won't condense in the dehumidifier and drip off into the collecting bowl.

Bring it inside and put it near the bathroom or in the kitchin where is it warm and humid if it still does not collect water probably faulty.

They work by drawing the moist air over a very cold plate, the water in the air condenses on the plate and runs off into the collecting bowl. Same reason cold windows or walls get wet.

Quote: Originally posted by jeff juke on 29/1/2012

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Bring it into the house and put it in a room with all the windows closed and put a bowl of water near it.It will take a few hours but if its working you should see water in the tank,

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Quote: Originally posted by Bernie 29/1/2012

Quote: Originally posted by jeff juke on 29/1/2012Bring it into the house and put it in a room with all the windows closed and put a bowl of water near it.It will take a few hours but if its working you should see water in the tank,

Not necessarily.  They condense moisture from the air, they do not absorb water direct from a bowl.

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Quote: Originally posted by jeff juke on 31/1/2012

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Water next to a dehumidifier will evaporate into the air and you will see it in the dehumidifier tank.

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Water near a heat source or in a warm room will evaporate, but in an unheated room the rate of vaporisation will be negligible, or was my 20 years of designing and commissioning air conditioning units wasted?