I have noticed some water collecting inside the inner tube, but am confident the unit is not leaking. What is happening?
The likely cause of this is condensation. The same effect occurs when you put a cold drink on the table. To keep this condensation from collecting, find the dew-point in your area and set the chiller above this dew-point to prevent condensation. Use this link for dew-point calculations: http://www.decatur.de/javascript/dew/index.