Could well be.
Last time I had a plumber round about a leaky radiator connection, his comments about the pipework were unrepeatable. I could only stand there and bleat that I didn't put them in, they were were there when I bought the place. "It wasn't me - honest, guv".
It might help if I could adjust any of my radiators, but the valves have been stuck solid ever since we bought the place over twenty years ago and don't budge.
They also have the tiniest inlet and outlet pipes I have ever seen.