I use one of these
www2.westfalia.net/shops/household/kitchen_appliances/electric_and_mechanical_appliances/dehydrating_appliances/193811-food_dehydrator.htm?refKey=-DdKKHErx
It's been very good, I have used it regularly for about three years now and dry mushrooms, apples, orange slices, fruit leathers, herbs, tomatoes, bananas, make things like beetroot crisps, courgette crisps (the secret of the latter is to dip them in soy sauce first) anything apart from meat, for which you need a far more expensive dehydrator. I turn it off if it feels too hot as I had a lakeland one that overheated and the motor burnt out, so now I never leave them on overnight. It's brilliant when something looks a bit wrinkly and you would normally throw it out, I just dehydrate them, store in jars and bung in casseroles. Onions, garlic, everything. I have freezers but they were getting too full, dehdrating saves on space but of course you need space for the machine.
My kitchen has no heating so I find all sorts of excuses to use it in the winter! I love it, and like being able to eat slices of dried banana (you just keep drying until it reaches the consistency you like) and apple rings, and elderly oranges become xmas decorations or are dried for being able to grate and use the zest as powder. Mushrooms are excellent dried and added to casseroles, as are carrots and onions. Turnip is the only thing I would avoid. I would advise anyone interested in the subject to buy a book on it as well.
I once had a very professional dehydrator but at that time didn't have enough fruit and veg to justify the space it took up. I so wish I still had it now.