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I have a Halstead Finest in an installation that has expanded to 17 radiators during our home extension activities. I suspect I need an extra expansion vessel in this set up. The internal expansion vessel in the boiler is 7 ltr. I have no way of knowing the total system volume but my guess...

Hi, Just joined this forum - excellent info here. I have a 1950's house that the previous owner has 're-arranged' the original downstairs radial circuits into a ring. The other circuits in the property are in PVC and seem to be OK. This 're-arranged' downstairs ring is mainly old VIR, rubber...