Congratulations on your purchase
We owned a 2012 2350 Sprinter and did not have any issues with cold weather starting, but probably never started in temperatures when it got down into the teens. There are a lot of commercial Sprinters in our area and I would guess they do not have block heaters.
As much as we enjoy our 2552 I do miss the performance and handling of the Sprinter, I think you made a good choice.
Bob