Hey Damon looks great!
What size expansion tank do you have on your install? I could not see it from the pic.
I have not added the load of DHW yet but presume it will handle it fine.
I have not heard of any issues. I have the 5GPM coil but I run it into the cold side of my 50 Gal. Rheem Marathon and recharge the Rheem from lower stat signaling of that water heater/storage tank so DHW is plentiful.
No out fires to date (10/23 fire up) and I don’t feel I have hit the dump zone for the past two weeks with my settings....... but I have no way of tracking that unless I'm in the basement. The boiler was sitting around 210F over night with no call for heat (TLC 2K running) and no DHW draw down.
I do like this boiler big time over my Tarm hand-fed boiler. I also run a Harman TLC 2000 nut burner in the family room, this keeps the wife extra toasty/
Enjoy the heat!