I think KAB is wrong on that one. When I upgraded from my 722k to the HWS, I lost the ability to play back recordings from my EHD when using Dish Anywhere. As far as I know, none of the Hoppers will allow you to play back recordings from your EHD when using Dish Anywhere.
It has been posted on this board that Dish has said that the ability to play back EHD recordings on the 622/722/722k receivers (using Dish Anywhere) was due to a "bug" in the software. That is one "bug" that I wish Dish would reintroduce into their software!