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Thanks every body, all noted

Thanks I was wrong, one tank overflow (c/w) is actually piped into the other tank (c/h) and then just one pipe from that to the outside. Does this change anything, if not can you tell me why they should be separate.

I have two tanks in loft, central heating and cold water headers. The overflows from each is combined into one pipe going to the outside Is this normal/correct regards Greaves