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Hi Thanks for the response. The problem started about eighteen months ago. Before that it was OK, so presumably pipe configuration can be ruled out as this has not been changed. I have tried running pump at both low and high speed. This makes no difference.How would I deal with oxide in cold...

I have an oil-fired vented central heating system. Whenever the heating is on there is a constant overflow of hot water from the inverted J pipe over the expansion tank. A new pump and motorised valve have been fitted. The whole system has twice been treated to remove sludge, drained, flushed...