Hi Anke
I have a L'equip filter pro dehydrator that I bought a couple of years ago and really like. Use if for veg, fruit and just recently started using it for making jerky for the dog from the pigs' lungs. Good and controllable with thermostat, only drawback I can see is the thermostat is measured in Fahrenheit although as lots of stuff re dehydrators on the internet is from the US maybe not such a problem. I think it uses much, much less power than having the oven on. Made some really nice dried apple rings earlier this year and they've kept beautifully. I would recommend peeling them and treating with citric acid solution before drying.
Piggers