Aawww, this looks so nice!

I really would want a more clever solution for our heating: district heating that goes int our "legacy" high-temperature old radiators, and also a secondary system with under floor heating but with a limited temperature. The problem is the "secondary" system is much bigger and heats most of the house, but is more or less unable to change its temperature since its always "capped" at the max since its driven from a high-temperature system, the shunt can not lower the temperature, also its a dumb one. So we have bang-bang thermostats everywhere for the floors which works, but is not at all optimal.