Underfloor heating air-water heat pump. House too warm when the sun shines

How do these values come about? Or are we talking about liters per hour? For me, the pump usually decides that 35l/min is enough. Below 26l/min it complains because the defrosting doesn't proceed quickly enough. I can hardly imagine how you’re supposed to get 50 times that through the pipes...

I meant l/h. But your values are very high

Depends also on the size of the house.

Old building with 260 sqm underfloor heating, spread of 5°.

I came across this thread by chance. If I understood correctly, a poor hydraulic balancing results in 2 problems:

[*]inefficient operation and thus higher consumption
[*]shorter lifespan due to increased compressor starts

Does point 2 also apply to modulating heat pumps?
We are getting a Nibe F2120-8, which according to my research is supposed to be modulating. Is there a technical term I should look for to find out the minimum power?

The questions are still of a theoretical nature, as we are moving in next year.

Modulating heat pumps can also be cycled. You can probably read the modulation range in the datasheet. Just google it.

It's crazy; people are sold a heat pump as a cure for CO2, but they are left alone with the settings and the high consumption just the same. But no problem, after 10 years they can buy a new one. Or replace the compressor for expensive money.