“you can change it without opening the cover (this is useful if you want to leave things on top of the radiator).”
Dumb question, but understand I’ve never lived in a house with a radiator… doesn’t the top of the radiator get very hot? When we were moving in, I told my son that cover over the radiator was likely to get hot and he probably shouldn’t put anything there in case it melts. Not true? Can you leave things there without expecting any damage?