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Today I drained down my system to add some flush to it because all indicators suggested it was in need...( noisy boiler, kettling etc..not been done for at least 6 years) On start up the upstairs rads are hot .downstairs cold.......switched off all upstairs rads........downstairs still...

Any one any tips for flushing my central heating system out? After start up for winter the boiler is noisy but functions well.... its old but it might just need a flush ... cheaper than a new boiler at any rate. If the exchangers is totaled how easy are they to fit.......its a two pipe...