We just switched to 05.
With regard to the heater, the installer said they would just put a hole in the wall for the metal vent (I am assuming B-vent).
It is a 410,000 BTU gas heater. I have suggested to the HO to get a 90% efficient heater so it could be ducted in PVC. Otherwise, it has to go up to the 2nd floor roof line and will look very ugly. The is a jut out on the garage, so it would penetrate the roof, then be seen all the way up from there.
The installer did say they had never installed one in a garage before.
Also, the LED is 120 volts.
c2500