> The problem as usual is with the users not the system. If anyone in your building turns the valve on their radiator off (because their space is overheated) th

> The problem as usual is with the users not the system. If anyone in your building turns the valve on their radiator off (because their space is overheated) then the water will condense and when they open it again the entire system will hammer, forever, until the building engineer drains it. If that's true, it would definitely be a problem with the system, not the user. A heating system that malfunctions semi-permanently if you turn off one radiator is not a good heating system, and it's not reasonable to demand that residents swelter in their rooms to accommodate the system's failings.