Heat pump: Hot water with potable water storage or instantaneous water heater?

Hello, I am planning a 250 sqm single-family house with two bathrooms and two additional toilets. A heat pump is to be used in combination with photovoltaics and a battery storage system. Heating will be via underfloor heating. What is the state-of-the-art heating technology for drinking water? Should I use a hot water storage tank connected to the heat pump or an instantaneous water heater, i.e., a so-called fresh water station? What would you recommend? Thanks!

What is "state-of-the-art" heating technology for drinking water? Do I use a hot water storage tank connected to the heat pump or a flow heater, i.e. a so-called fresh water station?

Both. Both options have advantages and disadvantages. In use and the end result of "sufficient hot water," both are equal with proper planning. However, fresh water systems are more expensive to purchase.

Both. Both variants have advantages and disadvantages. In use and the end result of "sufficient hot water," both are equal with proper planning. However, fresh water is more expensive to purchase.

Thanks. What would roughly be the advantages and disadvantages? What would you install in my case?

What would roughly be the advantages and disadvantages? what would you install in my case?

Many years ago I read about a third option here in the forum. Whether it makes sense or not, I cannot say. It definitely has not become widespread. Probably because it is simply more expensive and takes up more space. In addition to the (pure) heating heat pump, install another heat pump for hot water generation. For this, the indoor heat of the utility room, which is generated by technical devices (washing machine, dryer, heating, router, etc.), should be used to produce the hot water. In summer, the heating heat pump can be completely switched off and the hot water heat pump also extracts some heat from the house. Both heat pumps could be sized smaller and operate in more economical ranges. Does that work? - No idea

The first part of my post was lost:

The instantaneous water heater is usually installed close to the user, so hot water is immediately available. With the central heat pump, the pipe runs are long until hot water arrives or a circulation line with a pump must be installed additionally. In return, the heat pump uses energy more efficiently.

Often means:
Heat pump: more water consumption
Instantaneous water heater: more energy consumption

What would roughly be the pros and cons?

Advantage of hot water storage: cheap, works well Disadvantage of hot water storage: risk of Legionella (but this is only theoretical) Advantage of fresh water: very hygienic, works well Disadvantage: significantly more expensive