central heating


My Vaillant central heating system is fairly new and works ok. No one including the installer knows why it makes a thump if turn on a hot water tap when the heating is on. There is no thump when the heating is off.


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    3 Responses to “Why does my central heating makes a thump when I turn on a hot water tap?”

    • Yandel Kenworthy says:

      Air in the pipes is a common cause

    • Lea Woodward says:

      Dont worry, theres nothing wrong.
      its only making a noise because of the water pressure varying as you turn on the tap. Try bleeding the radiators if its bugging you :)
      (used to do plumbing)

    • Maxim Galbraith says:

      Sounds like you have too high of water pressure entering the home. Any plumber has a gauge that can test the pressure. If it’s over 60 psi or so, you should consider installing a pressure regulator. Once your pressure is moderated, the thumping should go away.

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