The water collection bucket may have a hose tap in it. But, in your case the hose drain connection is on the side of the unit. You have to remove the cover of the hose connection, before you can connect the garden hose. Here's where it gets a little tricky, because the Owners Manual says to leave the bucket in place. However, the Troubleshooting Guide says to remove the bucket, if water is not draining thru the hose. Which to me, makes sense, because the unit can't recognize that the hose is connected, if the bucket is still installed, because it has a safety switch.
In case you have misplaced your Owners Manual, here is a link to it, that you can download and print for future reference.
http://www.natlallergy.com/uploads/pdfs/Soleus-Air-30-40-Pint.pdfHope this helps you solve the problem.