So something like this would be vaporized water:
https://www.castinstyle.co.uk/produc...-iron-radiator
And this a water one?
https://www.castinstyle.co.uk/produc...-iron-radiator
I don't know how good you can see it here, but on continental Europe, one of the pipes is up, the other is on the base:
https://www.regatta.ro/images/w750/m...gt39862-4.jpeg
Those those pumps where good or bad wehn it camed to mantinance?
In Romania there was in use also the thermosyphon principle, so water would go up when got heated, and then camed down by gravitiy to feed the radiators.