As mentioned, the city controls the utilities to apartment buildings, including hot water. We were warned that in summer months they conserve. Our heat has been turned off for a couple of months, which hasn't been a problem.
However, yesterday morning NO HOT WATER! We think we could hear a man in a neighboring apartment expressing his displeasure at the discovery.
Now we heat water on the stove so Elder Mac can shave. : )
EDIT: It turns out all sections of the city get the hot water turned off while they check/clean the pipes. If yours are OK, you get your hot water back. If pipes are bad, they have to dig them up and you're out in the cold for a month or two. We have our hot water back already! Some missionaries have gone without for eight weeks or more.