I am getting the following error with hot water unit heaters in OpenStudio. The weird thing is that with OS was using E+ 8.1 I would not get this error, but with the updated OS that runs E+ 8.2 I am getting an error. It seems to be from zones that have zero heating load (such as an internal stairwell) that have unit heaters placed in them. Has anyone else had this issue, and does anyone know a way to fix it? I have tried hard sizing the unit heaters, and messing with the plant setting to no avail.