Air-water heat pump current consumption and data

Pellets are just total CO2 nonsense, regardless of the investment/operating cost.

But if that's not a reason, they are actually currently worthwhile.

Pellets are just total CO2 nonsense, regardless of the price for investment/operation. If that is not a reason, they are actually worthwhile right now.

CO2 is not even the main problem, since the pellets are made from renewable wood - fine dust is the problem. Compared to that, every diesel is North Sea air.

I hope the thread will stay alive for some time, as unfortunately I can only connect my two WPs in 4-6 weeks. Then we'll see how it looks with a self-made construction.

I hope the thread will stay alive for some time, as unfortunately I can only connect my two WPs in 4-6 weeks. Then we will see how it looks with a self-made construction.

Certainly.... as long as 18 degrees do not prevail in 6 weeks.

CO2 is not even the main problem, since pellets are made from renewable wood - fine dust is the problem. Compared to that, every diesel is like North Sea air

Why does our government go along with this then? I mean, the CO2 tax since this year does not even apply to pellets. That's pretty crazy.

I need your collective intelligence because I’m already so confused that the other day I adjusted the water level indicator of the houseplant because it looks like a taco setter :p

As you know, I have integrated the buffer tank in parallel to the heat pump and am using ERR more or less.
The be-all and end-all here is adjusting the flow rate and the pressure. Everything is adjusted here at the secondary pump, which supplies the underfloor heating from the buffer.

If I set the flow rate and pressure according to the calculation, the temperature difference in the heating circuits is very low at 2-3K, although 5K was calculated.
The calculation assumes a flow rate of 1300L/min with a pressure of 2m at 5K temperature difference.
Therefore, the heat pump reduces the flow rate to 800-900L/min to maintain the 5K temperature difference.

The system operates most optimally at the lowest level and constant pressure. Here I have a temperature difference of 5K in the underfloor heating and the heat pump runs at about 1000-1200L/min.
However, in the underfloor heating I only have a flow rate of 900L/min.
Here, the secondary pump only consumes 12W and has a flow rate of 900L/min at a 1.8m head. That seems very low to me.

Is a temperature difference of 2-3K in the underfloor heating desirable or simply too low?
Do you have any ideas?
Does it make sense to increase the pressure in the secondary pump and throttle all heating circuits so that they have a 5K temperature difference?