I heard of one boiler in DV that split open causing a signifiant flood. That was a about 3.5 years ago. Newish but out of warranty.
Something to keep an eye on. I wonder if any preventative maintenance or means of operation might prolong the life of the device?
Also I wonder if we all should be routinely turning of the supply when the leaving the property empty? Otherwise we risk flooding now only our own apartments but those below.