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    Oso 20 RI problem

    We have a Oso 20 RI cylinder which is supplied by a Vaillant Turbo Max boiler. The system (CH and HW) has been fine for 8 years with annual maintenance. Just recently we noticed that the HW "fades" after a couple of minutes at every tap in the house. The water then runs stone cold. If the taps...
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