I noticed that the dense steel boiler and solid fuel steel burning box match up in terms of HU at 128 HU/t each.
However the dense Chromium boiler and the dense Titanium boilers match each others burning boxes. Don’t remember the figures off-hand but the dense chromium boiler fits the titanium burning box and vice versa.
Is this a bug or a feature?
Numerical error about the combustion chamber
Feature, they arent supposed to fit, was a bad decision back then but not fixable anymore XD