Trouble is that if it's a fairly modern radiator (i.e. not like the old fashioned iron ones like we used to have in school classrooms) there is probably so little weight in it you'd be better off just taking it to the local skips. Certainly no weight in a barbeque and a microwave. Now if it was a couple of tons of RSJ's or similar they'd be fighting to get at it.
That was the radiator we had. It was farking heavy!!