It’s got a permanent drain plumbed in. However I wanted to make sure the dehumidifier was working (visible level in the bucket) before routing it to the drain (which is currently full of veggie oil to keep sewer gas out.I would think you'd need to have a dehumidifier in there with a permanent drain so that it can run as needed without having to get emptied.
I’m starting to think I should have put in some fire rated ventilation system, though. Would have been easier than electric heat, but I would still definitely need the dehumidifier in the summer.
I had 43% RH on the new gauge this morning. I don’t recall if I turned the dehumidifier on or off... I’ll find out when I get home how much difference either way it makes.