Bruce, not many could pull off such a successful repair....congrats (but dry that boiler when done!)
Rog
Thanks Rog.
I tested it for soundness really thoroughly before I spent any significant time repairing it, the remaining shell is quite thick & I bead blasted the inside of the boiler thoroughly as well, I'm not concerned about the rest of it.it now has a 2mm thick copper bottom underneath it slightly larger than the original heater. 275 ml. seems to be the empty fill capacity to keep the water level just below the intake for the cylinder assembly.