Rob, thanks for the heads up on the paint burning off once I fire up the boiler. I am not sure if it is high temp or not I know it has a primer and the gray paint there is primer only in the base.
The base is one of the older ones and it has been reinforced with extra metal since it looks like it was one that was rusted from a leaking DHW gasket.
I am planning on flushing out the boiler this week since I am not sure if I got all the mouse nest. I am thinking of using a garden hose and flush to the back of the boiler.