[jfax]

We have airing cupboards in the UK. Cupboards with shelving that keep the hot water tank, so it's built around using waste heat from that to now and then dry damp clothes. It's not a one-to-one replacement for full clothes drying, but it's a nice complement to it.

[physicsguy]

Not so much these days given the move to combi boilers though.

[graemep]

Unless you put the combi boiler in an airing cupboard - I have that and it works well. Not usual though - maybe it should be.