Ah, so the steam that is used to generate electricity comes from room-temperature water. Someone should have informed the folks over at Harrisburg of our little secret.
tpt.eltransition.ttan.tempHighValue = 8000
So you want an element that gets destroyed only after being exposed to 9500+ heat for quite a long time?
Why not use VIBR? It resists heat for a long time before giving way.
if you layer elements, I think that solves the problem. When I made ttan layered on itself many times, it became stronger and resisted heat better.