The dehumidifier WDH-520HB has excellent reviews on Amazon. That was also the reason to order the device. The actual function, drying, works well. We dry in winter laundry in the basement. The moisture we have with the device fine under control. As some already written, I will summarize my experiences briefly: Positive + Relatively small and good design + The Wheel for adjusting the power is greater than you might think, the humidity can be set very accurately. + After reaching the desired humidity the unit switches off completely + Good Guide + Good Price Negative - The removal of the water tank is a bit awkward - The function for heating cold rooms may indeed be useful, but heating with electricity is very expensive. - After one year, the unit will run significantly louder than the beginning, irregular vibrations create quite a noise. Therefore, the dehumidifier is best kept in a closed room in the basement. - The device is, as probably all other models also, quite a power-hungry. Unfortunately, that is downplayed by the manufacturer. Just run as unattended is not a good idea.
The grunsätzliche problem with the power consumption and noise, there will be other devices as well, but both could be much better in my opinion. Therefore, there is only an average rating from me.