System diagram with buffer and solar thermal

Hello

I am rebuilding my heating system. A 1000L hygiene buffer with 6 solar thermal collectors is being added to an existing gas condensing boiler. For this, I have drawn a system diagram and would like to know if you would do it exactly like this. A underfloor heating system is installed.

Regarding the diagram, I still need to explain what I have in mind:

The control should measure return sensor1 and buffer sensor2 and control a 3-way valve. If sensor1 is colder than sensor2, it takes the buffer heat into the gas unit. If it is warmer, the buffer is bypassed.

Better photovoltaic with heating rod than solar thermal. ;-)