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noisy optimax25c?

my ferroli optimax 25c is noisy when hot water tap opened and when central heating fires up
joel, May 2007
hopefuly this is not the case as it is new! any other ideas?
noise comes and goes depending on temp setting.

joel, May 2007
could be the pump on its last legs ?

hi-spec plumbing, May 2007
link Click here to see other fixes for Ferroli.