Air-Water Heat Pump - Buffer Storage Yes or No?

I also think is actually talking about a hot water tank and not a buffer for the hydraulics? After all, she is talking about showering. Yet the topic has already been well discussed even though the OP didn't even ask about it.

Oh sorry, I really assumed 300l for the water tank. I never assumed in my life to install a 300l buffer tank for the hydraulics and stuff.

Thank you for the numerous responses and the discussion about a topic I had no questions about :D I realize the topic of buffer storage is very controversial. Maybe I'll just flip a coin for the decision :P

Tell me a bit more about how you plan to use the system. Above all, the handling of the [Einzelraumregelung (ERR)] is decisive.

I have an air-water heat pump + photovoltaic system here. Hot water (180 l in our case) is covered for 4/5 of the year, heating about 1/3. More photovoltaic, more efficient heat pump, etc. are always possible, of course. We also discussed this in the Gas boiler/air-water heat pump thread with some data from a real house. ;) And my large buffer tank is also called "Estrich". We don’t even need to talk about the small 10-liter thing in the GU-installed system.