Hydraulic balancing underfloor heating

So you haven't received a design calculation for your underfloor heating? And is the 7K differential now in the problem room or the others? Which room is the problem room? Living room? Bathroom? Guest room?

ouch, 15kw heat pump... is that a new building?

Yes, she wrote that the house is new..... well, that alone doesn't mean much, we also have a 14kw heat pump, but we also have 285m² to heat.....

Yes, the house has 300m2... The 7k have the normal rooms, the problem room feels significantly larger... it is a guest room with about 20m2

Yes, then just increase the flow rate as a test so that it reaches a reasonable temperature difference. Important for the temperature difference would also be the information about the supply temperature your system is running at and how the heating curve is set. Unfortunately, with your bits of information, there’s not much to work with besides a crystal ball.......

Sorry, I am a layperson and do not necessarily know what the relevant information is. The supply temperature is approximately 35 degrees. Unfortunately, I do not know the heating curve.