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How To Bleed A Radiator

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  • Uploaded 3 years ago in the category Favorited Videos

    James the plumber explains in this handy and informative video from Trade Radiators, how to bleed
    a radiator, as well as the reasons for it and ways to hopefully prevent it happening again.

    You can tell if you need to bleed a radiator by feeling the heat of the radiator; if it is warm at the
    bottom but cold at the top, then it means that air is trapped at the top.

    There are various reasons for
    this air accumulating, the most common being that Inhibitor fluid hasn’t been added to the system
    water causing it to react to the components inside the radiator and producing hydrogen.

    reasons for the trapped air is that the pump speed could be set too high so the water is caveating
    (the molecules are splitting) which produces air, or that work has been recently been undertaken on
    the system letting air get in.

    Having ensured that the heating system is completely switched off, check that your radiator valve
    key actually fits the valve.

    If it doesn’t then a flathead screwdriver should fit.

    Open both of the valves
    at the bottom of the radiator, then slacken off the top valve slightly and let the air escape.

    water starts to come out of this valve, then you can tighten it back up.

    James shows you how simple
    it is to bleed your radiator yourself, although he does caution to keep a cloth handy just in case you
    need to mop up any water that leaks out.

    Once you have bled your radiator, don’t forget to close the
    bottom valves too.

    Having shown you how to do this, James also goes through reasons and solutions for if no air and no
    water come out.

    One of the first things that you can check is the pressure vessel for the system as
    this could have dropped.

    To resolve this, you will need to find the filling loop inside your boiler or
    airing cupboard and open it up until the pressure reads as 1 bar again.

    If you have a gravity fed
    system, then this issue could be caused by a blockage in the pipe from the loft or the ball valve being

    If it is a blockage, you are best to get a professional in.

    If you find that you are having to frequently bleed a radiator (or radiators) and it’s a chronic problem
    with your heating system, then the best thing to do is to call in the plumber who originally fitted it
    who should be able to solve the problem for you.

    The radiator featured in this video can be viewed and purchased here:

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