Its concerning for me as a member of the public that my Gas -Safe Engineer (who`s reg name & member I have checked online) assures me their method of doing this work is safe and will not give any probs. Yet here I have a consensus of Engineers saying this is not the case.
However, I will enlist a couple of other "Engineers" to quote.
Is not just engineers.... It's also a senior member of the technical side of the boiler manufacturer. Can't get much more confirmed than that I'm afraid.
Afraid I am of the same opinion as some others have stated, you would be better putting the cost of having this flue extended towards having a new boiler installed and flued correctly, you have a very poor and very expensive to repair boiler
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