My lot just don't seem to 'get' radiators - Smidgen was happily using the radiator bed for months - then I turned on the radiator, and he stopped using it. Esther sits on the lid of the covered litter tray and snuggles up to the radiator - but again, refuses to use the radiator bed when I install it alongside the litter tray lid - you just can't win at mine. Dave, on the other hand, seems to have developed his own particular approach - clever dave!