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At this point you need to put up or shut up, i.e. either sue the installers for whatever damages you feel entitled to or get over it and move on.

As someone with some experience of technical disputes I would recommend the second course of action. As lawyers are fond of saying, a bad settlement is better than a good case. Your case is weak unless you commission an expert report that quantifies your hypothetical damage to the heat exchanger. Such a report, assuming you can find someone willing to do the work, will cost considerably more than just replacing the HX on spec. Keep in mind that there's no guarantee that you'll get the costs involved back even if you end up winning the case.
Like I have said...We await Vaillants decision . If they say they are happy to put a warrantee in place as there has been no warrantee in place legally (This is not open to debate its all in their terms ) Then fine . If they say there is an issue then we put all the cards on the table to The heating company and take it across social media if they dont want to step up and make amends . Something the new American owners of the company might not like ! And make people aware and check their installs to see if they have the same issue .As according to a "manager" its very routine to fit them on the flow of Vaillants . I have seen companies act far quicker when a issue is "Made public" than going down the legal path .
 
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Vaillant have confirmed that they will honour the original 10 year warrantee . We will just now see if we can get the heating company to cover the exact period of time the boiler was not fully protected after the warrantee period has finished. This then means The company is confident their mistake wont have affected the boiler . .
 
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Are not Vaillant admitting in a way then that it doesn't matter where the Mag filter is installed?, if the mistake was discovered say 5 years into the warranty period wonder would they still cover the remainder as long as it was changed to the boiler return.
 
Is that a 12 year warranty so?.
No , 10 years Valliant and we plan to settle with the heating company that should the Heat exchanger fail within 20 months after that .They cover it .Due to the Exchanger not been protected fully for that time due to their mistake
 
Are not Vaillant admitting in a way then that it doesn't matter where the Mag filter is installed?, if the mistake was discovered say 5 years into the warranty period wonder would they still cover the remainder as long as it was changed to the boiler return.
Exactly..... Complete joke with whats stated in their terms etc . Might be wrong but could be they dont want to fall out with a huge customer based in a part of LOndon that forms part of their name 🙂
 
Vaillant have confirmed that they will honour the original 10 year warrantee . We will just now see if we can get the heating company to cover the exact period of time the boiler was not fully protected after the warrantee period has finished. This then means The company is confident their mistake wont have affected the boiler . .
Pretty much what I said then 😉
 
Pretty much what I said then 😉
Yep...But shocked Vaillant never binned the warrantee . They could . Would teach people to take care with their work . Imagine you buy a new Ferrari and after 1 year you had "back of the arches Jimmy" do a load of work. Would you think Ferrari would say it would not affect the warrantee etc ? ! But through this event, I got to see the true earning of one of their "engineers" . Not a bad income 🙂
 
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The radiator heating temperature for a contemporary combi boiler should be adjusted for a flow temperature of between 60 and 70°C. If any greater than this, the boiler won't operate at its most effective efficiency and performance level and enter condensing mode.
 

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