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boiler venting into small loft tank

Discussion in 'Plumbing and Central Heating' started by Helg, 14 Jan 2020.

  1. Helg

    Helg

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    Have similar problem, water overflows into small f&e tank, about one bucket every 30 mins, is slightly rusty colored, have traditional system, hw cylinder 30+ years, pumped heating, vented system, radiators also mostly quite old (30+ years), heating works well, NOW MY PROBLEM - one plumber says there is a split in hwc, the other one says the system is just jammed up, needs power flushing, which one is right? pointless changing hwc though in course of that job some flushing out needs to be done anyway. Want to mention that tap water (hold and cold) are perfectly clear. I REALLY NEED SOME GOOD ADVICE, THIS DRIVES ME NUTS! Thanks to all who post a reply
     
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  3. denso13

    denso13

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    Better if you start your own thread.
     
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  4. JohnD

    JohnD

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    If dirty water is coming out of the vent pipe into the small tank when the boiler is running, it is more likely a sludge and sediment problem. You can start by giving it a chemical clean with X400 or similar, drain it out and rinse after a couple of weeks. This is likely to help and is cheaper than a powerflush, but not as thorough.

    If you had a split coil, the water level in the tank could rise and overflow, without coming up the vent pipe. Which is not what you are describing.
     
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