I have a bathroom in which I've been trying to tackle the build up of condensation. It has a shower over the bath, a 4" humidistat extractor fan, a small electric heater on the wall, which I do use whilst taking a shower. There is no window and the walls are cold to the touch before taking a shower, probably below the Dew point. I can clear the condensation after taking a shower with a demuidifier, however this still does not resolve the issue of the walls becoming wet whilst showering.
I would be grateful if you could offer any advice about what I can do to increase the ventilation and temperature in the bathroom.