How can I get the pressure value inside a solar absorber

[Basimalasi]

so I'm doing a little project in solar thermal energy and I want to do the calculations before I start anything. I am stuck on getting the value of the pressure of the water inside the absorber when the temreture gets to 350 C. Is there a way to calculate it using thermodynamics table or something less complicated or is it only obtained by direct measuring?

 

[insightful]

The vapor pressure of water at 350 C is 2350 psig.

 

[Basimalasi]

Wait is it that simple! ..god**mn it