vaillant distillate pressure drop

  1. R

    Vaillant boiler pressure loss - correct diagnosis?

    Hi All, I have a Vaillant Ecotec Plus 637 with an unvented hot water tank that was installed about 2 1/2 years ago. Not under warranty as missed the first service and then Covid... There was always a small leak from the hot water tank PRV but I recently had this replaced and now no leak from...
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