ᐅ Air-to-water heat pump supply temperatures

I have that one too 😀. I just reduced the parallel shift by 0.5 degrees. Let’s see. At minus 15°C (5°F) it shows me a calculated return temperature of 28.5°C (83°F). That should correspond to about 31 to 32°C (88 to 90°F) supply temperature. But it never actually gets that cold.

Okay, if your house actually only has a 2.8 kW heating load, it's no surprise that it can't get rid of the heat and cycles frequently.

However, 2.8 kW doesn't match with KfW 55 standards and the flow temperature.

Has anything else been done additionally?

Yes, there is an 18-liter (5-gallon) mini buffer tank installed in the return line, which is supposed to provide the minimum defrost energy... Unfortunately, I couldn’t avoid this because of the general contractor.

Although I can adjust the power consumption of the compressor in the control system, as a layperson, I’m hesitant to do so (also due to warranty and guarantee concerns).

Do you also have a buffer? How did you solve this ordeal, @Bookstar?

Based on the cold outside temperatures, I’ve been running the system since last night with a 0.10 heating curve (can’t go any lower) and a flow temperature of 25°C (77°F). The only interruption was for domestic hot water preparation. Currently, the indoor temperatures are around 20°C (68°F) to 21°C (70°F). I have now adjusted the heating circuits again and hope the bathroom will get warmer.

Additionally, I’m hoping that when I take a closer look at the heating circuit pump tomorrow, it is set to variable flow rate rather than constant flow rate. If I can switch it, I expect to get more flow in the heating circuits.