Hanover, PA fire museum opened not to long ago and I visited the past couple weekends with my son.
It’s steam heated with an unusual system (I think). It is a down feed up feed combination of 1 pipe and 2 pipe air vent. Steam mains are in the ceiling of the first floor (14’ ceilings) and they downfeed the first floor and upfeed the second.
First floor return pipes go into floor and then basement, I have not been into basement, but the one gentlemen claims the boiler is an Iron Fireman.
They are supposedly going to stop using it and change to (my guess) forced hot air. I might try bending the ear of them and see if I can convince them otherwise.
I am including a picture of one of the cool pipe radiators in the garage area. This fire house originally used horses and at one point a steam pumper. They have done a fantastic job with the preservation.
if I can convince them to get an evaluation from a real steam pro, would you be interested?