In our rental apartment, the heating and hot water tank are also in the attic, and this week we had a very unpleasant experience. My boyfriend went to the toilet at night, and water came through the ceiling. Behind the heating, a connection in the water pipe had come loose, and it ran for about an hour before we noticed it. Approximately 6 cubic meters flowed through, and now three apartments have to be renovated. The plumber said he also doesn't understand why so many people want to have this in the attic, because there are always serious problems when something happens. Maybe that's something to consider as well. Of course, you always hope that something like this won't happen.