My two cents worth on Ceili's affection for the radiator would be to keep her away. I have found that ferrets are not very heat sensitive. On the list we have heard many a story of ferrets almost crawling into fireplaces while in use, which included my dear sweet ferret Hun-Hun. So I would pile some bricks under the radiator maybe so Ceili can not crawl under it. Or fashion a wire fence around it so she can't get near it. Maybe spray some "Bitter Apple" under and around the radiator to deter her. Anything to keep her safe. I hope this helps. From Judy in Kansas the land of Ahhhs, And Weezul and Tbone too. [Posted in FML issue 0665]