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Well thanks for that, very revealing. I am not an idiot! Of the two of us, there is only one idiot.

Hi (and a Happy New Year) Just joined the forum. After reading lots and lots on the forum trying to tie down a fault on the above boiler, I have tried the following. History: New house with above about 8 years ago. I don't know a technical term, but the system has 1 tank for both...