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  1. S

    filling loop for a vaillant combi 637

    Hi Simon. you are absolutely correct I have a heat only system! Now off to B&Q to get a filling loop. Many thanks.
  2. S

    filling loop for a vaillant combi 637

    Hi I need a filling loop kit for my Vaillant ecotec 637 combi boiler. Does anyone know where I can obtain one? :(
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