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Hot water to taps question re vent pipe

  • 31-01-2021 2:23pm
    #1
    micks_address
    Registered Users, Registered Users 2 Posts: 8,819 ✭✭✭


    Hi folks,

    This is probably a dumb question. What prevents water going up the vent pipe in an open vented system? The feed from the cylinder to hot taps splits to vent pipe upwards and downwards to taps.

    Is it the lack of pressure or gravity? Conversely what causes the water to go through the vent pipe?

    Cheers,
    Mick

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Comments

  • #2
    Sleeper12
    Registered Users, Registered Users 2 Posts: 17,157 ✭✭✭✭Sleeper12


    Water does in fact go up the vent/expansion pipe. It's a gravity fed system so the vent pipe & the water inside it is governed by gravity. It's only the last bit of the pipe won't have water unless the temperature of the water gets too hot. The hot water will then expand into the top part of the pipe and out of the end of the pipe and flow /surge into the cold water tank

    A bad plumber might tap into this pipe at floor level in the attic, run it across the floor and drop it down inside the wall & into a shower. This will cause the shower to suck in air on hot at high speed. Running shower at low speed may cut down on the amount of air.


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