Tumble dryers eat electricity !. There is no such thing as a low energy one they are all around 3 KW . I try not to use ours as it is so expensive to run.
There are some that have a sensor and automatically turn off when the washing is dry you do not waste power.
The cheapest to run are gas-powered ones (eg made by White Knight).
If you want electric ones, do you want condenser-type or vented?
You'll find that the cheapest to buy are the most expensive to run (Which? finding).
dont buy a condenser type they are crap ! get one when you can fit a stretch vent pipe to it that you hang out of a window to vent the moist air out of the room it's in
Why on earth would you advise someone to buy a conventional vented dryer when purchasing a condensing type costs less to run (for the same drying effect)?
As has been correctly identified by ginj above, the cheapest ones to buy (and that means vented types) are the most expensive to run, followed by condensing types, followed by heat pump types. The latter heat pumps dryers are the most expensive to buy (doubt if you can find one for less than £500) but the majority are 'A' rated for electricity consumption.
Now that's proper advice - not random unsubstantiated comment.
your entitled to your opinionated remark builder i have not found ours to cost a fortune to run it's got a sensor in it to cutdown power when in use . i
Lol deggers, im fully aware of tumble dryers and flexable hoses, ive had a few, but hanging out of a window!
Some of us have moved on, we always had a vent in the wall. Im not totally ignorant thanks.
good for you but as i live in a maisonette not possible fella nothing wrong with once a week "hanging a pipe out of a window " so glad for you that you've "moved on ",enjoy your life cos i am