I dont think it is smart either. One error and water leaks, damaging equipment and is a safety hazard. Dont forget, these things are run 24/7. I juz dont find it smart. The miners are alaays placed closely together. It could be a catastrophe if water leaks everywhere.
However, I am curious, at wat temperatures do they run at?
Your question is similar with a friends above, roll up to have a look.