Heat pump: buffer tank, capacity and modulation

Such "games" should only be played with fresh water tanks/stations because of Legionella.

If the memory is emptied daily, there are no problems.

So you would rather recommend the 290-liter tank, if I understood that correctly?

If the tank is emptied daily, there are no problems.

This is not always guaranteed with 300l. There are always days when more or less is consumed. Above all, it is not verifiable whether the tank has actually become "empty". Although the tanks never really become empty anyway. Water always flows in directly and then mixes with the existing legionella.

That is not always guaranteed with 300l. There are always days when more or less is consumed. Above all, it is also not verifiable whether the tank has really become "empty". Although the tanks never actually become empty. Water always flows in directly and then mixes with the existing legionella.

What would be your recommendation then?

Recommendation would be that you share something about your water consumption. The three of us easily manage with our 180l. I grew up in a family of five with a similarly sized boiler. It worked too, as long as no one wanted to bathe and shower at the same time.