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    Noisy Glow Worm Ultimate 50FF

    Thanks for the replies. The boiler is only 5 years old in a new house. The cast iron boiler does have 2 drains, one in each lower corner. It seems strange that after the first flush (With water and X400), it went quiet straight away. It is only after flushing again that the noise returned...
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    Noisy Glow Worm Ultimate 50FF

    Recently my boiler started to make loud kettling noies. I flushed the system with clean water. The expansion tank was also full of muck so drained and thorougly cleaned it. I then added X400 to the system. Within a day, there was no noise from the boiler. I left the X400 in for 1 week, then...
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