Noisy Bubbling Glow.Worm Micron 50ff?

Many thanks for the advice - I will give your suggestion a go.......

Paul
August 2007

sounds like your boiler is kettleing which is what happens when your heat exchanger is scaled up and the boiler gets hot.
it's caused by condensate water dripping on to a hot heat exchanger

you can buy a chemical for this that you add to the system and just leave it in and it cures it.

hi-spec plumbing
August 2007