Boiler water can damage the pipes in multiple ways, and its treatment is an exact science which should be performed by a professional. If the pH is in the correct range, it is likely that correct regular maintenance has been occurring, and the pipes’ internal surfaces are probably in good condition. If the pH is too high or too low, we must assume that regular maintenance has not been conducted, and the internal surfaces of the pipes are damaged. If your building has a boiler heating system, I always test the pH, and look for evidence that the other critical components, such as the low water cutoff valve (LWCO) have been properly maintained.