Well, let's say for example there are four of you in the family. Each family member wears a fresh pair of gruds every day. That's 7 * 4 = 28 pairs of undercrackers. Add to this the extra pairs you might need when you play sports or there is some other form of light soilage rendering the briefs useless. Let's be generous and throw in two extra pairs per week - per person. That comes to 36 pairs. Assuming an average victorian radiator of 1.5m in length and allowing for the difference dimensions of thongs / boxers etc perhaps each radiator can accommodate maybe six items at once - unless you're really determined and have those plastic things that attach to your radiator and get more stuff on so you can really maximise the amount of water you evaporate into your rooms day by day. So you need SIX rads just to get the PANTS done - before you've even started on the things that are larger and take longer to dry. In addition, one should consider that rarely are all pants available to launder on one day and therefore, due to the cyclical nature of the wash - and if you insist on drying on radiators, the chances are that every day - you're going to have top see your pants steaming in one room or another. Pop them in the tumble dryer. The dryer removes the water, which is the bit you don't want in your house all the time if you can help it. Enjoy the warm, dry air and that comes out of the tumble dryer - that's a bonus. Of course I recognise that to some - a tumble dryer might not be affordable. However, the majority of people I know can well afford them but for some reason are determined instead to have their houses full of drying underpants - but then go and spend ?40 on a round of drinks without a thought. They have lost their perspective.