... few more properties aren't included.
Some of the Thiele stuff dates back 1987. Designed for compatibility
wrt the Process Control System in project, pocket calculators ...
No matter what you use, providing you can trace.
Accuracy of that stuff is as good as any other source.
Enjoy ... comments welcome.

Jean

Inst_IAPWS region 1.sm (182 KiB) downloaded 67 time(s).

Wrote

... few more properties aren't included.

... add rho to your download.

Inst_IAPWS region 1 [rho].sm (57 KiB) downloaded 58 time(s).