My hunch is that there was possibly an endothermic process taking place, plus water cooling. Try to falsify that.
I cannot completely falsify it but it seems to be physically impossible and it makes absolutely no sense at all. That is close to falsifying!
It is physically impossible because you cannot get that much water service in Florida at a small commercial warehouse like this, as I explained elsewhere.
It makes absolutely no sense because why would Rossi go to the trouble of hiding the waste heat? It would be simpler, easier and far cheaper to use air cooling. So why would not he simply air cool the machine? He claims he has to hide the secret J.M. endothermic machine because it is protected by IP, and of course anyone can use x-ray vision to look inside the machine and read the IP. Okay that makes no sense, but there is nothing remotely secret about air cooling. So rather than hide the air cooling equipment, it makes sense that he would show it to visitors and thus prove he is actually producing 1 WM.
He would definitely need this cooling equipment, because he claims the reactor produces 1 MW all the time, even on days when he said it was turned off. It is not possible the magical factory produces twenty-four hours a day even on weekdays and holidays.
Equipment large enough to cool down 1 MW with air cooling is cheaper than water cooling I think. The equipment is about the size of two automobiles. I suppose the landlord might allow it outside the building. One thing is certain: no such equipment was installed at Rossi's site. No air or water cooling, and no large ventilation system such as you see in a commercial kitchen or bakery. There is nothing like that.