High Temp Float Valve - Steam Generator Question

[Salt Must Flow]

I have a 7.5 gal keg that's been converted to a small boiler and I never use it as a boiler. I've been considering installing one of these float valves connected to my home water supply. I'm still searching for other float valves too.

Here's one option rated for 200C/392F
Here's another option rated for 100C/212F

I know that when the water is boiling continuously it creates a disturbance in the water level which means the float will bounce as well. I have this feeling that there would be some equilibrium with the disturbance, the fluctuation of the float valve and not allow the element to be exposed. I imagine the valve will allow some water to enter when it doesn't necessarily need it as well as not allow water to enter when it may need a little. I'm suspecting that during a run, the water level will remain relatively the same.

I know that people often use float switches or float valves in a separate vessel connected to the boiler (two connections) to more precisely regulate the water level as well as to equalize the pressure in the 2nd vessel. I'm just trying to keep things as simple as possible which leads me to desire using a float valve.

Safety pressure relief would also be used.

Has anyone tried just using a high temp float valve before?