After I wash or rinse the hose, I am able to reconnect it and run the machine with the humidifier tank empty and attached, but the humidifier turned off (under the options menu). The heated airflow dries out the water in about 8 minutes. I asked the respiratory therapist if that was bad for the unit or if putting it to that use was messing up my usage data for her - she said no. Otherwise, I found the hose just did could not dry out if left to hang-dry by itself, and I don't imagine that sort of constant moisture can be a good thing bacteria-wise. I read some folks sharing that they shake or spin water out of theirs - that didn't work for me, though have to say that I was not really aggressive about it, not wanting to damage any of the long, thin heating wire or make cracks in the hose, and the little force that I was willing to use just didn't shake out very much water at all.
When I turned my humidity setting up from 4 to 5 I got bad rainout with my heated hose in a cool room. But adding a cover solved that problem. The hose never felt warm.