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Plate heat exchanger keeps clogging up

Discussion in 'Plumbing and Central Heating' started by Moluskman, 15 Jan 2020.

  1. Moluskman

    Moluskman

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    Hi all,
    my radiators work fine but every 6 months or so my water starts running cold (Halstead Ace High Gas combi). I get the heat exchanger changed and it's great again for another 6 months. When I drain the radiators the water that comes out is a little dark but not sludgy as such but there is visible black particles in the heat exchangers that are taken out. Incidentally, the system is always filled with inhibitor and a few years ago I got the system flushed but it didn't seem the have any lasting effect; there is a magnetic filter too.

    My question is, what is causing this?, is one of the radiators disintegrating some how?, if so how can I ascertain which one?, I've considered getting a new boiler but am concerned that the problem may still be there and that will clog up too.

    Any advice would be much appreciated.

    Thanks.
     
  2. Madrab

    Madrab

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    Is it clogging up on the Ch side or the mains water side, are you in a hard water area? How old are the radiators?
     
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  4. Moluskman

    Moluskman

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    Hi, thanks for the reply.
    So I guess your asking which side of the heat exchanger is clogging up, truth is I don't know, until I looked at an unblocking video today I didn't realise the 2 sides had separate flows. I'm in a hard water area.
     
  5. Moluskman

    Moluskman

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    PS. most radiators are of a newish type- double wall with vent thing over the top edge, there are a few which are the older type but nothing ancient.
     
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  7. ianmcd

    ianmcd

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    Suppose you could try installing a magnetic filter on the return to the boiler, but to have to fit a new plate heat exchanger every six months would indicate a very dirty system which you dont seem to have
     
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  8. DIYnot Local

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