Here’s another one. I know someone who’s upstairs neighbours radiator pipes ran through their apartment. The pipes are scalding hot when the neighbour’s heatin

Here’s another one. I know someone who’s upstairs neighbours radiator pipes ran through their apartment. The pipes are scalding hot when the neighbour’s heating is on. What is the legality of slapping a big honking heat sink on the pipes? He never did it but we discussed it, from both technical and ethical points of view.