The reason I ask is that:-
My boiler heat exchanger failed (leak) after 14 months of use!
I contacted Heat Team (Baxi aftersales), they said I would have to pay £170 std charge for them to come out and diagnose the problem (even though I'd told them what was wrong, as my plumber had had a look).
I was told this visit by the Heat team would repair any parts and include labour on everything except the heat exchanger! I made the point that the heat exchanger should not have failed so soon!
3 and a bit weeks later they finally replace the exchanger! (after hassling them most days to get this speeded up) as we have a 8 month old baby.
Then came the BS!
They said possible causes for failure are:-
Scaling found in the exchanger - I was then told that it had to be descaled every 12 months (Baxi technical confirmed this is not true!).
Water turning acidic and attacking exchanger, because of lack of flushing to remove flux after istallation! (I saw commissioning flushing + addition of correct inhibitor with my own eyes. I took water sample and PH tested as I work in a powerstation and it was 7.9, so no probs there.)
Then the relevant bit........ The Heat team 'engineer' stated that the 28mm fitting exiting the boiler would indicate that the 22mm pipe would be too small, and that this would cause overheating in the exchanger due to the heat not being able to get away quick enough!
So I need to prepare a argument that this would not cause the heat exchanger to fail!
They have 'let me off' the £275 cost for the new exchanger, but I am still £170 out of pocket (which they will not refund), due to the initial investigation/fix.
I feel that the exchanger has failed for a reason that is not down to the installation, and could possibly be a manufacturing fault. Surely 2 months out of warranty this should not occur and i should not be £170 worse off for the convenience!