The hotter the water, the faster pipe will develope pin holes. Is the water from this water heater hotter than the other's in the complex? In one building I oversee now, there are 5 separate boiler rooms feeding 5 areas of the building. In only one area, every copper hot water pipe was springing leaks. Only in one area.
The other four areas delivered water at 105º and this area delivered water at 150º
And if it's just one length of pipe or a couple of lengths, it may not be the same pipe used elsewhere. Sometimes plumbers run short on material and buy whatever's available locally too. If the whole building's done in K ir L type pipe and they ran out and put in a couple of lengths of M, that will leak first.
