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I have three rads all with metal o valves that squirt out water through the screw surround.This is the slotted screw gets turned 180 degrees to adjust the heat.The main problem is that the rads that have them are barely lukewarm but are hot one end,where the thermostatic valve is but cold...

Having a lot of rust come out of my hot and cold tap and wc, the system was drained repeatedly and on filling eventually ,I realised I needed to put in additive so drained off about 3 litres in order to accomodate the additive.The needled didn't move at all and the rads when bled,didn't have any...