Should the fresh water station always operate at a target temperature of 60 degrees? Progress?

Good day. Can someone please provide me with a regulation or ordinance that states that a fresh water station in a multi-family house (built in 2016) in combination with a buffer tank must always be operated at 60 degrees setpoint? So then buffer supply with 65 degrees. I have found several pieces of information indicating that this does NOT apply to fresh water stations, since no warm water is stored here. 45 degrees should also be sufficient here. Legionella should not be a problem since it is also additionally thermally disinfected weekly at 75 degrees. Limescale is also not a problem between 45 degrees and 60 degrees, and there is no risk of scalding. (On the contrary, at 60 degrees setpoint). However, I cannot find the regulation stating that a fresh water station is allowed to be operated below 60 degrees (e.g., 55 degrees). Private multi-family house with 5 units. Thank you very much.

The trick will be that no drinking water is stored. The water in the buffer is heating water. The fresh water constantly produces fresh warm water like a continuous flow heater. Therefore, you don't need to worry about the temperature. By the way, you also don't need a legionella program there.

He will need proof to convince the homeowners' association. That should be found in the [Trinkwasserverordnung].

In this context, also directly check whether the Legionella test required every few years is necessary or not. That also costs a three-digit amount.

He will need proof to convince the household community. That should be found in the Drinking Water Ordinance. In this context, also directly check whether the legionella test required every few years is necessary or not. That also costs three digits.

Hello. Yes, exactly. I would need to know the regulation for that. I also understand that the fresh water is practically a kind of tankless water heater. But I can't find a regulation in the DVGW. Only about commercial or public. But not for a normal small apartment building with 5 units. The branch line from the circulation line is also very short.

For me, a multi-family house with 5 units is a commercial property.

...and whether the system is a small or large installation. I assume a large installation in the sense of the DVGW...