Remember that all the water in the clothes does not simply disappear; it comes out of the clothes as water vapour and will condense again somewhere else. If the vapour is blown through ducting to outside, then there won't be a condensation problem indoors. If the vapour is condensed within the machine and then the water is contained and can be poured away, then there shouldn't be a problem indoors. If the vapour is simply left in the house, then it might well cause problems unless the whole process is confined to a well ventilated room. Drying clothes on an airer or radiator will usually cause problems. We always use our clothes line in the garden; we usually fit in with the weather patterns so we hang out when it's not raining.