Why does my central heating makes a thump when I turn on a hot water tap?


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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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