Simple to see the difference
Firebox Thicknesses Comparisons
This photo shows the thinness of a typical stainless Steel Firebox; just 1/16 of an inch.
The industry standard for a steel firebox is half as thick at 1/4"
Hyprotherm's STANDARD firebox is 50% thicker at 3/8"
Hyprotherm's Heavy Extreme Duty Firebox is a whopping HALF INCH THICK, for only $399 on some models, as demonstrated by the far right drill bit's size!