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Hissing and banging?

Potterton Puma 100E combi wall hung, Heating works fine no problem, on hot water start up boiler hisses then bangs, this happens for 20-30 seconds then settles down water then heats up no problem, is it a problem with expansion vessel.

Joe Harwood
November 2006
sounds like heat exchanger scaled up.

hi-spec plumbing
November 2006

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