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Hi Chris, I can see under the boiler and the only valves are: D.H.W. Isolation valve Gas Cock C.H. Isolation Valves and there is one other that I can see on the diagram in front of me but it's just labelled S and has nothing written about it. The pipe goes up to the safety value and...

Hi, I've recently moved house and noticed that when the heating was on the radiators were only hot at the bottom. I vented the air out of each radiator and they are all warm except for one and I think this is due to there not being enough pressure in the system to fill the radiator fully...