Hmtdotty55

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Obviously you might be in search of leaks generally however the condensate produced by condensing pure fuel boilers is slightly corrosive.
If a condensate entice leaks onto some metallic it's going to corrode it.

I typically come across boilers and installations the place a condensate entice or its pipework is leaking.
This is particularly dangerous when it is leaking onto a fuel pipe for instance.