Love living in a flat - love having no garden to worry about BUY only downside is not being able to hang washing outside. Really miss that. So, when I moved here I bought a Heat Pump Condenser tumble dryer. Lives in my guest bedroom(craft room.
Heat pump dryers take longer to dry a pile of washing, but much less in running cost. (they sort of run on an 'eco programme').
Even so, since energy costs started to soar upwards, I try not to use it too much. If weather is dry and sunny, dry off most of my weekly washing on large airers in that room with windows wide open. Also have a small dehumidifier in that room.
But on nasty gret, wet days, it is a relief just to put it all in the dryer, over and done with.