Cleaning boiler heat exchanger

Discussion in 'Plumbing and Central Heating' started by DiyNutJob, 30 Aug 2020.

  1. DiyNutJob

    DiyNutJob

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    My gravity fed gas boiler hasn't had a clean for many years. I am thinking of cleaning it indirectly. Here's my idea:

    1. Drain one of the radiators
    2. Put 500ml Fernox F3 in the radiator
    3. Run this for the winter
    4. Do a complete drain and refill for the whole central heating in the spring and add inhibitor

    My goal is to clean the boiler and not the radiators. Will this work?

    Thanks.
     
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  3. muggles

    muggles

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    No, it won't work. If you put cleaner anywhere in the system, it'll circulate around the whole system when you switch it on.

    What makes you think it needs cleaning?
     
  4. DiyNutJob

    DiyNutJob

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    Why do you say it won't work if it gets circulated everywhere including the boiler? I want it to go into the boiler. If it gets into other places too, that's ok.

    I have had plenty of kettling in the past. I imagine that would produce scaling. Also, I am in a hard water area.
     
  5. MrTherm

    MrTherm

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  6. DiyNutJob

    DiyNutJob

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    Thank. Is it ok to run F3 for 3 months - length of the winter?
     
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  8. MrTherm

    MrTherm

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    Can be left in system permanently - as per instructions.
     
  9. DiyNutJob

    DiyNutJob

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    Good stuff. That will be less hassle than calling out a boiler man.
     
  10. muggles

    muggles

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    Well in your first post you said quite specifically that you wanted to clean the boiler and not your radiators, so my response was based on that...
     
  11. DiyNutJob

    DiyNutJob

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    Ok, my intention was that the boiler was the main target. The rest would be collateral damage. At £6.5 a shot from ebay doesn't seem too terrible, assuming it does anything at all.
     
  12. DIYnot Local

    DIYnot Local

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