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Hello again, I just checked, and there seems to be a device that looks like a gate valve joining 2 pieces of pipe that comes from the top of the radiator and joins onto the pipe at the bottom of the radiator. There isn't any handle on it - but there is a bolt that looks like it could be...

Hello Oilman, Of the 16 radiators on the system, approx 1/4 can be controlled with these thermostatic valves. The two radiators in question do not have them - but I have noticed that this part of the house seems to be an area where (I think) the Central Heating may have been added to or...

Hello, There is a banging/tapping/knocking noise coming from one section of my Central Heating System (ie. in the pipe between 2 radiators). It seems to only happen when the heating system is active. Can anyone suggest what might be causing it, and how I can fix it - it is driving me mad...