BrotherBart said:
The thermal conductivity of cast iron and carbon steel are virtually identical.
No doubt, since they are both predominantly iron.
Of course, you also need to look at their specific heat, that is, the amount of energy required
to raise a given mass by a given temperature (
http://en.wikipedia.org/wiki/Specific_heat_capacity),
but I would be astonished if they were very different (between cast-iron and steel) either.
So these reported differences are undoubtably due to differences in the overall mass, as well as
the thickness of the walls, of stoves made using the two materials.
Since my new BK Princess (if it ever arrives) will be almost exactly the same mass as my old
Dutchwest, I have confidence it'll store a similar amount of heat in its mass. Of course, since
its dimensions will be larger, it probably does have thinner walls on average.
