On: Heliogen’s new tech could unlock renewable energy ...

[Zenst]

You also tend to have higher air pressure in hot sunny area's needed for this tech and that will also increase the melting point of iron. So whilst a small detail, certain one that would be measurable on running costs/energy needed.

[tlb → Zenst]

The melting point of iron doesn't depend noticeably on pressure with the range of atmospheric pressures, as you can see from the flat lines in the phase diagram at https://en.wikipedia.org/wiki/Iron#/media/File:Pure_iron_pha...