I have a T5 Classic being installed at the very moment I'm typing this. (Very exciting, but also a bit nerve-wracking too, hoping all goes smoothly.) Interestingly, it says it's a Series D (3.4g/hr), yet the manufacturer date is listed as 01/2019. There'd been a post from somebody in Nova Scotia (?) who has an EPA2020 version (Series LE) purchased last fall. I wonder if they were manufacturing both models simultaneously for a while and everything heading off towards Montreal was made EPA2020?