ᐅ Retrofitting Underfloor Heating?

Hello,

we would like to install underfloor heating in the lower living area. Currently, there are radiators installed.

Which system would you recommend?
I have heard of a thin-bed underfloor heating system that can be connected to the existing heating circuit. Do the radiators need to remain in place for this, or can the supply be connected directly to the underfloor heating?

Best regards

I once saw something like this on the Rotex website. They mill into the screed and then lay the pipes in it.