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How do I replace Worcester Highflow 3.5 Heat Exchanger?

The heat exchanger is kettling and I have been advised to replace it. Are there any manuals available to show me how to do this as I like to have a go myself. Thanks.
Motty, September 2010
Did you ever manage to do this as I need to do the same job on my boiler and am wondering how difficult a job it is.

John P, December 2010
link Click here to see other fixes for Worcester.