Normal invar b.boxes + boilers, bronze engine and bronze crusher with a random ore inside (16KU/t required). I’m using large invar pipes to put distilled water in, normal invar pipes to get the steam out. The setup is symmetrical, with the engine in the middle.
EDIT: I’m gonna try a tin alloy engine, since that can take slightly more steam than the bronze one I’m hoping that it can keep up with 3 invar boilers without overheating