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Many thanks for replying Agile-in fact reading your excellent answers to questions was one reason I havejoined DIYnot! First -although I am at present living in Hungary my home -house -is in England and its there my GEM lives. I did wonder however if you could give any answers to my...

I have 14 year old GEM combi-dont laugh-its in good shape except DHW supply on off etc-cause (BGH) scaling of secondary heatex- BGH will descale using sonic method but I can have it descaled using chemicals-its taken out and put in a chemical bath-BUT it may leak-drip when refitted -What should...