Window With Radiator Curtains . Heavy curtains are more resilient to heat and can be allowed to touch the radiator. The patio doors opposite have long curtains. Curved Radiator for a bay window. White shutters living room, Bay from www.pinterest.com As explained above, it depends on the type of cover you have and some are better at radiating heat than others. Ripplewear window coverings are custom made for mercedes sprinter vans, from years 2007 to present. If the radiator is old water or steam radiator, then curtains hanging over the radiator will burn but not catch on fire.