Steam boiler idea?

[Prairiepiss]

I posted about it in my wood fire steam thread. But I figured this should have its own thread.

I’ve seen both steam injection and Steam jacketed Boilers mentioned. What about a steam coil inside the boiler. A coil or two of stainless or copper tubing positioned on the inside of the boiler. Much like a flake stand. Where the still charge liquid is in contact with the whole tube. Unlike the jacketed boilers where the outside is loosing heat to the surrounding air?