Hello,
The mentioned DIN standard is intended to indicate from when, for example, potable water can be operated at a reduced temperature (below 60 degrees Celsius (140°F)).
It is important to know, among other things, whether the system is a large installation or has increased water usage.
However, no one can give a definitive answer. These are probably just guidelines rather than legal requirements.
I would like to know if there is increased water usage in this case.
One potable water system for five residential units in a new building.
Recirculation line:
The longest hot water pipe from the recirculation line to the outlet is max. 6 meters (20 feet)!
Therefore, the requirement of 3 liters (0.8 gallons) between the recirculation line and the outlet is complied with!
The residential complex is continuously occupied, and hot water generation is started about 50 times daily.
To avoid scalding and significant lime scale deposits, but still reduce the residual risk of Legionella (which are only reliably killed at 70 degrees Celsius (158°F) and above), I would like to operate the hot water at a target temperature of 55 degrees Celsius (131°F).
This would have several advantages (no lime scale deposits, less risk of scalding than at 60 degrees Celsius (140°F), potential inhibition of Legionella growth).
However, there is no binding confirmation anywhere that potable water can be operated at 55 degrees Celsius (131°F) instead of 60 degrees Celsius (140°F) in this case...
Thank you very much.
The mentioned DIN standard is intended to indicate from when, for example, potable water can be operated at a reduced temperature (below 60 degrees Celsius (140°F)).
It is important to know, among other things, whether the system is a large installation or has increased water usage.
However, no one can give a definitive answer. These are probably just guidelines rather than legal requirements.
I would like to know if there is increased water usage in this case.
One potable water system for five residential units in a new building.
Recirculation line:
The longest hot water pipe from the recirculation line to the outlet is max. 6 meters (20 feet)!
Therefore, the requirement of 3 liters (0.8 gallons) between the recirculation line and the outlet is complied with!
The residential complex is continuously occupied, and hot water generation is started about 50 times daily.
To avoid scalding and significant lime scale deposits, but still reduce the residual risk of Legionella (which are only reliably killed at 70 degrees Celsius (158°F) and above), I would like to operate the hot water at a target temperature of 55 degrees Celsius (131°F).
This would have several advantages (no lime scale deposits, less risk of scalding than at 60 degrees Celsius (140°F), potential inhibition of Legionella growth).
However, there is no binding confirmation anywhere that potable water can be operated at 55 degrees Celsius (131°F) instead of 60 degrees Celsius (140°F) in this case...
Thank you very much.