Does that not depend on the cause of the leak in the first place though?
Brian

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The Sofa of Brian Gaff...

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Given that the reconditioned hx is two years older than the original, it
will be interesting to see how long the "new" hx lasts.

I would imagine most gas engineers would take the view that is was more
"economic" to replace the whole boiler considering it is 7 years old than
to replace the hx.