Air-water heat pump current consumption and data

I need your collective intelligence, .... Is a differential of 2-3K in the underfloor heating desirable or simply too low? Do you perhaps have an idea? Does it make sense to increase the pressure in the secondary pump and throttle all heating circuits so that they have a flow rate of 5K?

You should balance the volume flows against each other and have equal volume flow in both circuits. Only in this way can you prevent turbulence in the buffer. Because that costs efficiency and thus a higher heating curve will be required. However, I do not know your buffer and cannot say whether turbulence-free flow is possible at all. There are buffers that have baffle plates installed at the inlet. If you have such a model, turbulence-free flow will be difficult. The differential is then only of secondary interest. The mixer must, of course, not mix. Depending on the power of the heat pump, I have a differential of 2-4.5K during the heating cycle and it gets warm.

yes, I understand that.
But if the differential temperature in the underfloor heating is lower than that of the heat pump and the flow rate of the secondary pump is fixed while the heat pump is modulating, the flow rate of the heat pump will always be lower than that of the underfloor heating.
Optimal would be the exact opposite: flow rate of the heat pump slightly higher (100-200l/min) than that in the underfloor heating.

If the secondary pump runs at level 1 with constant pressure, I have heat pump flow = underfloor heating flow without losses and an exact differential temperature of 5K in the underfloor heating!
However, it then only has 900l/min, 1.8m and approx. 12W



Is it possible that a medium temperature eventually establishes itself in the buffer when all the water is completely mixed?

or should I set the spread of the heat pump to 3K as well?

Doesn't the heat pump regulate the spread independently?

I'm not a pro, I haven't understood your setUp yet. How big is the buffer? Is it a pure heating buffer? So hot water separate? To what temperature do you heat the buffer?

yes I understand that. But if the spread in the underfloor heating is smaller than that of the heat pump and the flow of the secondary pump is fixed and the heat pump modulating, the flow of the heat pump will always be lower than that through the underfloor heating. It would be optimal the other way around: flow of the heat pump a little higher (100-200l/min) than that in the floor. If the secondary pump runs at level 1 with constant pressure, I have heat pump supply = underfloor heating supply without losses and an exact spread of 5K in the underfloor heating! But then it only has 900l/min, 1.8m and about 12W

I already told you that in the other thread. With a modulating heat pump this mixer/buffer construction is really bad precisely because of the modulating flow volume in the primary circuit and fixed flow volume in the secondary circuit.