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Hi there, can someone please tell what is this, its name and purpose? It seems that is clogged up, if I bring magnet to it - it sticks! Thanks

We have a conventional system with 10 radiators (30+ years old, the boiler is 4 years old). The radiators are not getting hot water, although they are all bled. When all radiators are open, it takes couple of hours for the first couple get hot, next two get worm, then next two luke...

Last November, we had a loss of heat to the ground floor radiators and British Gas engineer suggested a power flush. Then we called the local plumbers (who originally installed us a brand new Worcester Bosch boiler two years previously). So after reporting the problem last year the local...