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    Vaillant VCW-sine 18 T3 W GC Code 47 044 01

    Vaillant VCW-sine 18 T3 W GC Code 47 044 01 I have had this now for about 20 years but recently when I draw Hot Water the system is heating the radiators at the same time. The Hot Water is not very hot. I read somewhere divertor valve, can anyone tell me the part number and how easy it is to...
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