Air-water heat pump current consumption and data

: quite simple: My heating engineer received a written statement from Brötje that the system must under no circumstances be modified, even though he has already done so. Brötje refers to the warranty, which expires if the buffer is removed from the hydraulics.

Since my hydraulics do not work the same way as yours, it really depends on the flow rates ;-)
Anyway, this is about something else, so BTT:

after 24 hours, consumption of 32kWh at outdoor temperature = -9°C including 1x hot water.
COP 3.3
Heat pump has been running continuously.

just a quick example regarding efficiency and buffer: This one has exactly the same system with the same hydraulics: So it somehow works! It would be quite surprising if everyone advertised with an annual performance factor of 4.5+ and then required a buffer that completely kills the efficiency.

: quite simple: My heating technician received a written statement from Brötje that the system is absolutely not allowed to be converted, although he already did that. Brötje refers to the warranty, which expires if you remove the buffer from the hydraulics.

Since my hydraulics do not work the same way as yours, the flow rates do matter after all ;-) Anyway, this is about something else, so BTT:

after 24 hours, consumption of 32kWh at AT=-9°C including 1x hot water.
COP 3.3
Heat pump was running continuously.

That's not good, my boy! I averaged 28 kWh over the last 3 days. Not great either...

that is not good my boy! I averaged 28 kWh over the last 3 days. Not great...

But his supply temperature is 39 degrees. Right?

It would indeed be quite surprising if everyone advertised with an annual performance factor of 4.5+ and then prescribed a buffer that completely kills the efficiency.

No one claimed it kills the efficiency completely. But if I install a buffer storage tank with energy efficiency class C and the associated standby losses and additional hydraulic tuning, I simply lose efficiency.

That's of course stupid of Brötje to castrate their good heat pump so much with such a shitty mandatory hydraulics....