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  1. J

    ITS THAT GEM AGEN!!

    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...
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