Air-water heat pump flow temperatures

I am currently experimenting with my heating curve and would be interested to know what supply temperatures you are currently running with your air-to-water heat pump in combination with underfloor heating?

Max 31.5°C. Indoor temperature remains relatively constant around 23.5°C

Outside temperature currently 5.1 degrees, return flow 24.2, supply flow 24.4. Room temperature 22-24 degrees

Yes OK my interpretation also allows a maximum of 30°C flow temperature...

What interests me is the relationship between flow temperature l, room temperature in relation to outside temperature.

If I need a temperature difference so that the room, for example, warms up to 20-21°C, then the flow temperature must (regardless of the outside temperature) be at least x degrees higher.

That's why I wonder if, for example, at 5-10 degrees outside temperature, the flow temperature must already be at least 24°C in order for the room to reach 20-21°C?

But then there are only 6°C left until the max. flow temperature of 30°C is reached, although the difference between the standard outside temperature and the example of 5-10°C is 15°C (difference from 10°C to -15°C).

I hope I was able to express myself half reasonably clearly and didn't make it too complicated?

That depends solely on your house or the insulation values; you can't give any general values for that.

Outside temperature currently 5.1 degrees, return flow 24.2, supply flow 24.4. Room temperature 22-24 degrees

Because it is not standing during a cycle.