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    Vaillant VCW Sine 18 T3 Overheating & Tepid Hot Water

    I have a VCW Sine 18 T3, which apart from problems with the diaphram and diverter valve (both replaced in last year) has functioned pretty reliably for the last 6 years. I recently had a system leak due to the failure of a section of plastic pipework (peeled open like a banana skin)...