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I have a blockage in my system so I'm thinking of using a flushing agent. The bottle says to drain the system after flushing. The problem is my ground floor rads are each supplied individually from the 1st floor and don't all have drain cocks, so my question is this: If I drain the system...

Hi, I don't think this has been dealt with elsewhere but I'm new to this forum so please forgive me if it has. I have a newish (less than 5 years old) radiator that just doesn't heat up, although it used to! It only has standard valves and the entry valve gets hot (sometimes). I've tried...