The utility generators probably don't worry too much about leaks, since they can just refill with new, abundant hydrogen, too.
It would be amusing to have a hydrogen-cooled hard drive for which you'd have to regularly refill the water tank so that it could generate more hydrogen for itself. :)
Yes, it's the hydrogen that leaks out that's the problem. I was told that the way to find hydrogen leaks in plant piping was to walk the line holding a corn broom over the line. When it bursts into flame you found the leak. In an enclosed space it can form an explosive mix with air if it doesn't ignite before it accumulates.
It would be amusing to have a hydrogen-cooled hard drive for which you'd have to regularly refill the water tank so that it could generate more hydrogen for itself. :)