I have a built in wardrobe next to an en suite and have always had problems with residual humidity. I have used all the products - the absorbent powder through to battery absorbers (which don't work). I bought this unit fairly skeptical of its claimed abilities - but it does actually work. It is small, quiet - I've tested it is only uses 21 Watts of power. Whilst its claimed 250ml a day I cannot match even when I put it directly into a steamed bathroom after shower use, realistically it pulls for me about 500 ml of water a week. Having put a power point in my wardrobe I now have a set-and-forget solution. I'm still unsure of the technology of actually how it works - but the point is it does!