ᐅ Should the potable water station always operate at a target temperature of 60 degrees Celsius? Progress?

Hello,
Could someone please provide a regulation or code specifying that a domestic hot water station in a multi-family building (built in 2016), combined with a buffer tank, must always operate at a setpoint temperature of 60°C (140°F)?
In that case, the buffer supply temperature would be 65°C (149°F).
I have found several sources indicating that this does NOT apply to domestic hot water stations, since no hot water is stored there.
A setpoint of 45°C (113°F) should be sufficient.
Legionella should not be an issue, as thermal disinfection is additionally performed weekly at 75°C (167°F).
Limescale is also not a problem between 45°C (113°F) and 60°C (140°F), and the risk of scalding does not exist (actually less at 60°C).

However, I cannot find the regulation stating that a domestic hot water station may also operate below 60°C (e.g., 55°C (131°F)).
This concerns a private multi-family building with five units.

Many thanks!

The trick is that no drinking water is stored. The water in the buffer tank is heating water. The fresh water system produces warm water continuously, like an instantaneous water heater. Therefore, you don’t need to worry about the temperature. By the way, you also don’t need a legionella prevention program.

He will need evidence to convince the homeowners’ association. This should be found in the drinking water regulations.

In this context, also check directly whether the regularly required legionella test every few years is necessary or not. That test costs three digits as well.

guckuck2 schrieb:

He will need proof to convince the homeowners’ association. That should be covered in the drinking water regulations.

In this context, also check whether the legally required Legionella testing every few years is necessary or not. That test is quite costly.

Hello.
Yes, exactly. I need to know the regulation for this.
I also understand that the fresh water essentially acts like a kind of instantaneous water heater.
But I can’t find any regulation from the DVGW.
Only for commercial or public buildings.
But not for a normal small multi-family house with 5 units.
The branch pipe from the circulation line is also very short.

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

...and whether the system is a small-scale or large-scale installation. I assume it is a large-scale installation according to the definition of the DVGW...