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Potterton 80 EL Heat Exchangers Kettelling noise?

Is it common for the heat exchanger to cause the fault known as kettelling? Also is the only answer a new exchanger?
John Dean, June 2007
if it's blocked yes.

you can have it powerflushed.

we do alot of heat exchanger's due to blockage of muck or limescale.

hi-spec plumbing, June 2007
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