I had some humidity problems in the basement and I thought I can buy a dehumidifier. I bought the this one on ebay Dehumidifier 500ml. I knew they are not good enough, but I wanted to try.
This type of dehumidifier uses a peltier element to cool an alumium disipator (peltier cool side), which condenses the humidity. The condensed humidity drips into a water tank until it is full. Then, a switch is triggered and the system stops. The peltier hot side has a bigger disipator and together with a fan disipate the generated heat.
PS: Good luck to all of you who are struggling with the washing machine in the basement.