Experiences with brine heat pump

Thank you very much for your feedback. So the opinions differ here as well. I will first work without night setback. The error resulted from a faulty sensor.

: you are talking about adjusting the heating curve to the house. How do I do that most effectively?

It would be nice if you start arguing first!

The argument was in #308. I emphasize again, since you apparently overlooked this in your defensive reflex, that this is not my argumentation. In this respect, you can keep dancing around the issue, I will not elaborate further.

just google Heizkurve or heating curve. I find it quite well explained on the bosy online site (he likes to explain things in detail, I think) and I also found a good description on the Viessmann page. And then you have to experiment a bit...

The heating curve is not set just like that. It requires at least one winter plus transitional period. Always adjust only one parameter at a time and then wait 1-2 days. On days when, for example, there is heat input from outside through the sun, no changes should be made.

In short: lower the level and slope so far that on cold and dark days the coldest room is still just warm enough.

Ideally, all individual room thermostats are constantly open (then they are basically pointless) and the rooms always have the desired temperature thanks to a suitable flow.

In short: Lower the level and slope so far that it is just warm enough in the coldest room on cold + dark days.

Misunderstanding on my part or did you formulate it incorrectly?

Doesn't the heating curve need to be lowered so far that the warmest room is just warm enough? You then regulate the colder ones via the flow rate.

By the way, it took me about 3 years for that.
In the first and second year I adjusted the heating curve using the ERR.

At first, it was too cold for me during the transitional period (so level too high) and in winter it was too warm (so slope down). What you set in the transitional period does not necessarily have to fit in winter and vice versa. So in the next transitional period you check how the settings from winter perform and adjust again.
One winter and one transitional period are therefore not really sufficient or you would have to keep records not only of heating data and settings but also of weather and personal feeling of warmth.

In the third year I gradually adjusted the flow rates and when I no longer had to change anything, I deactivated the valves to get rid of the electricity consumption of the constantly open valve.

If all rooms are turned up fully and the heating curve is set correctly, one room will reach the target temperature (e.g. 22°) while all others will be warmer. Those rooms then need to be throttled. Therefore, the coldest room is already correctly defined. Of course, it is optimal if the heating system is properly designed and all rooms become equally warm (or warmer if desired, like the bathroom).