HCL to clear blockages central heating

Discussion in 'Plumbing and Central Heating' started by emphasis303, 12 Apr 2015.

  1. emphasis303

    emphasis303

    Joined:
    31 May 2007
    Messages:
    369
    Thanks Received:
    0
    Country:
    United Kingdom
    Evening all,

    Has anyone tried adding Hydrochloric Acid HCL to a central heating system and ran it whilst heating is on? I understand it will react with water especially when hot.

    All copper on the system, just looking at a way round replumbing central heating due to severe pipe blockages.

    Any recomended methods or a big no no?

    Thanks
     
  2. Sponsored Links
  3. DP

    DP

    Joined:
    10 Dec 2003
    Messages:
    15,150
    Thanks Received:
    3,356
    Location:
    Glasgow
    Country:
    United Kingdom
    Unless someone can give you written guarantee that it is ok to use that acid on heating systems, stick with known products. Fernox DS40 is good enough to shift almost anything
     
  4. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,427
    Thanks Received:
    3,104
    Location:
    Daventry
    Country:
    United Kingdom
    Why not use a proper flushing chemical, which is designed to do the job and not react with water?

    If you have no circulation whatsoever then nothing in the world will shift it
     
  5. emphasis303

    emphasis303

    Joined:
    31 May 2007
    Messages:
    369
    Thanks Received:
    0
    Country:
    United Kingdom
    Everything has been tried, including ds40. Plumber mentioned someone using hcl but recommended replumb.
     
  6. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,427
    Thanks Received:
    3,104
    Location:
    Daventry
    Country:
    United Kingdom
    If DS40 hasn't sorted it then it's replumb time
     
  7. Hydrochloric acid will not react with water, it will however react with copper to form copper (2) chloride which is soluble in water. I feel you will potentially do more damage than good.
     
  8. Agile

    Agile

    Joined:
    26 Jun 2004
    Messages:
    64,039
    Thanks Received:
    4,595
    Location:
    London
    Country:
    United Kingdom
    There are two different copper chlorides, one soluble and the other not.

    But that's largely irrelevant.

    The serious reason to NOT to use HCl in a heating system is because the HCl will react with iron and rust from the inside of the steel rads to form ferric chloride.

    Ferric chloride is VERY corrosive to copper and is the traditional etchant used to make copper track printed circuits at home!

    As said, if citric acid ( DS40 ) has not cleared the blockage then its unlikely that anything else will shift it. ( unless its contains a lot of lime compounds in which case sulphonic acid ( DS3 ) just possibly might do something ) But most heating system blockages are caused by iron oxides which are dissolved easily in citric acid.

    Tony
     
  9. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  10. Sponsored Links
Loading...

Share This Page