It's seemingly becoming increasingly likely you're right - and it certainly wasn't me who thought, let alone claimed, that there is such a regulation. However, as has been said (not the least, by me!) many times before, in a situation like this the absence of proof is not proof of absence.
I absolutely agree. I have had on several occasions needed to replace heating controllers that have fried because the numpty installer has left a 13A fuse in the FCU, rather than the 3A specified in the MIs.
It seems the same confusion and arguments there with no conclusion.
...but is it wrong?
IF they design them so they cannot be used in Europe, then that would appear to be the case.
It's usually others asking this question (or making this point), but (assuming such boilers exist) are you suggesting that manufacturers who do that do not sell the boilers concerned in the rest of Europe, and will include instructions that they must not be installed other than in the UK?
I agree. It's not only speculative but, in my opinion, very unlikely (particularly if it were it a boiler sold for use in other countries, where it would have only 16A external protection).
Who knows? However, I doubt that many PCBs would survive the current required to blow even a 3A fuse if that current were flowing through PCB tracks.
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