Is the hot water tank sufficient?

Anyone who produces 62°C with a heat pump in a hot water storage tank either has not understood the principle of a heat pump or has too much money, making the consumption costs rather negligible!

v.g.

Then probably the former. I got the data from the info sheet of Vaillant and the site manager also mentioned the 62°C for the water. What exactly is wrong with that?

A heat pump cannot produce 62 degrees without generating high electricity consumption, unless you live in Dubai. Heat pumps usually operate with a flow temperature of 30-35 degrees. Here, the heat pump has a good efficiency. If you want 60 degrees, the electricity consumption unfortunately increases not linearly, but exponentially. This means your heat pump becomes uneconomical.

A heat pump cannot produce 62 degrees without generating high electricity consumption, unless you live in Dubai

Correct!

....Heat pumps usually operate with 30-35 degrees supply temperature. Here the heat pump has a good efficiency. If you want 60 degrees, the electricity consumption unfortunately does not increase linearly, but exponentially. This means your heat pump becomes uneconomical.

Correct, however the supply temperatures for domestic hot water are somewhat higher (50...55°C). Therefore, sensible hot water storage tanks for heat pump operation look significantly different (volume, heat exchanger surface) compared to, for example, gas condensing boilers! Combi boilers mostly fail here! In my planning, I rather use external, "heat pump friendly" suppliers for this! Best regards.

A heat pump cannot produce 62 degrees without generating high electricity consumption, unless you live in Dubai

Nobody says that.

Heat pumps usually operate with a flow temperature of 30-35 degrees. Here, the heat pumps have a good efficiency. If you want 60 degrees, the electricity consumption unfortunately does not increase linearly, but exponentially. That means your heat pump becomes uneconomical.

We’re talking about the water for the shower here, right? Because I definitely don’t shower at 30°. I need 40°C. That has nothing to do with the underfloor heating, which will have a flow temperature of around 30°C, if I understood that correctly.

Hi
this is about the sizing of the heat pump and its favorable operating range.
The main job of the heat pump is space heating. It can do this cost-effectively with low supply temperatures and that is what it is designed for.
The secondary job is hot water preparation. This requires higher temperatures, which represent unfavorable conditions for the heat pump. Therefore, the hot water storage tanks for heat pumps are only heated to a temperature that represents a compromise between comfort and cost. And here 62°C is far beyond what represents a favorable compromise. Often such temperatures can only be achieved by an electric heating element. If the heat pump can achieve it directly, then with such a poor efficiency that the electricity costs incurred are in a very unfavorable ratio to the achieved performance.
Then the higher investment costs for the heat pump compared to e.g. gas condensing boilers would no longer be amortized, which is already difficult enough in reality.
Better to have more storage optimized for this type of use at lower temperatures than a standard storage tank with high temperatures.

Sorry, explosive:

You really don't know much yet?!

The storage tank for hot water (€ I would say user requirement) is not simply chosen larger even with a heat pump.
And the hot water consumption of a heat pump is a joke compared to heating (unless you bathe in the whirlpool every day).
The geothermal heat pump easily achieves temps of 70 degrees WITHOUT an electric heater.

How do I know this? Because I have one, there is a legionella protection once a week, and I see the summer/winter months compared on the display.