Depending on the curve, they may not need it to be ambient temperature... it may just need to be below the melting point of say aluminum - 660.3°C.
I’m curious how this single device handles that kind of temperature differential. Granted it’s not a glass dish that cracks under boiling water, but wow.
Common metals and alloys could not handle that kind of thermal stress. They must be using some exotic material to that kind of rapid temperature gradient.
I work in the electric power industry and we have strict heat up and cool down rates to prevent exceeding thermal stress limits.
That kind of cool down rate wouldnt even be possible in our condenser. But of course, we dont have liquid hydrogen or oxygen flowing through our tubes.