Experiences with brine heat pump

You haven't even done a hydraulic balancing, you're fiddling with the heating "somehow" - what do you expect?

To be honest, my consumption values are not bad. I'm curious about your values when the heating is on. Saruss consumption is simply extremely low.

I somehow apparently also have a relatively warm brine. Then it is effectively possible to achieve the lift to 25° flow temperature or so in April. Apart from that, I used 2000 kWh in the first year, but only 1400 kWh in the last 12 months. Apparently, new construction + residual moisture also seem to play a role. I have to look at the degree day figures, but the winter was not much warmer than the one before.

I still have to wait because tiles were laid - so there will be no heating for 4 weeks.

Anyway, these values are not meaningful yet, because I can only properly perform the hydraulic balancing and fine-tuning next winter.

Last time during normal operation, I had a performance factor of 6.3 ...Of course without hot water. But I don't see that as realistically sustainable...

But do tell. I'm very interested. We are now at 5.6 for heating in April. In winter, that is certainly not sustainable.

My heat pump also only has a coefficient of performance of 4.8 at B0W35... at B5W35 it's already 5.4 (which for me as the brine inlet is already quite the lower limit) and I would have the 35° flow temperature at -18° or so, but especially in the transitional period the brine is a bit warmer again and the flow temperature is about 25°C, there coefficients of performance over 6 are normal. For domestic hot water it goes down, but since overall more heating energy than hot water energy is needed over the year, that’s not a big deal. In summer the brine inlet temperature is rather around 10°, and if you only make hot water once a day then, the coefficient of performance doesn't drop that much.