If you have an old system, maybe twenty years old or more, my advice would be to inspect the radiators for incipient leaks. You need to use a small mirror and examine the bottom of the radiator surface next to the wall. Not just the seam, but the water bearing channel above it. Look for strange bulges in the paint, or rust marks. Don't poke them or try to seal them, just decide what you're going to do about changing the radiator.
It could avoid a serious problem, for example a leak might develop while you're away !
It could avoid a serious problem, for example a leak might develop while you're away !
