Bomberbaz

I have a valliant ecotec plus 831 and wish to install a hive single channel receiver. I’ve noticed conflicting views on which RT socket is the correct one.

is it the 24V or 230V; can some please shed some light on this matter?

Is the following correct?
https://www.youtube.com/watch?v=1dGOzK_m_kU&feature=share