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Greenstar CDI heat exchanger holed?

View the thread, titled "Greenstar CDI heat exchanger holed?" which is posted in Boiler Advice Forum on UK Plumbers Forums.

Quick question folks please. Could this be anything other than a cracked/holed primary heat exchanger on this Worcester Greenstar CDI? No apparent leak with system pressured until heat is called for. Many thanks for replies.
 

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