ᐅ Domestic Hot Water Temperature According to DIN 1988 3-L System – New Regulation Planned?
Created on: 9 Dec 2020 09:13
H
Hausi99Good day.
Some energy consultants have informed me that the hot water regulations DIN 1988 are currently being revised.
Many new systems are now planned and installed using the instantaneous water heater principle (e.g., fresh water station) instead of the previously common hot water storage tank.
With a hot water storage tank, hygienic measures (legionella prevention) require reaching at least 60°C (140°F).
However, with modern instantaneous water heater models, this risk no longer exists (provided there are no dead-end pipes).
Currently, this is regulated by the 3-liter rule.
My questions for the experts:
- Is it really confirmed that this regulation is being revised (also for multi-family buildings)?
- Does the current 3-liter rule apply to the volume of the hot water piping, including the circulation line and branch lines?
Example: For a 15mm (0.6 inch) pipe, this would mean approximately 22 meters (72 feet) of piping.
- What measures are currently required to operate a modern new building with a fresh water station in a multi-family building at temperatures below 60°C (140°F)? (With circulation).
There are currently many differing opinions from heating installers, trade associations, and manufacturers. Somehow, there seems to be no clear regulation.
The example always refers to a multi-family building (5 units) with a fresh water station and circulation.
Thank you very much.
Some energy consultants have informed me that the hot water regulations DIN 1988 are currently being revised.
Many new systems are now planned and installed using the instantaneous water heater principle (e.g., fresh water station) instead of the previously common hot water storage tank.
With a hot water storage tank, hygienic measures (legionella prevention) require reaching at least 60°C (140°F).
However, with modern instantaneous water heater models, this risk no longer exists (provided there are no dead-end pipes).
Currently, this is regulated by the 3-liter rule.
My questions for the experts:
- Is it really confirmed that this regulation is being revised (also for multi-family buildings)?
- Does the current 3-liter rule apply to the volume of the hot water piping, including the circulation line and branch lines?
Example: For a 15mm (0.6 inch) pipe, this would mean approximately 22 meters (72 feet) of piping.
- What measures are currently required to operate a modern new building with a fresh water station in a multi-family building at temperatures below 60°C (140°F)? (With circulation).
There are currently many differing opinions from heating installers, trade associations, and manufacturers. Somehow, there seems to be no clear regulation.
The example always refers to a multi-family building (5 units) with a fresh water station and circulation.
Thank you very much.
-Does the current 3-liter rule apply to the volume of the hot water pipework, including the circulation pipe and branch pipe?
For example: For a 15mm (0.6 inch) pipe, this would correspond to approximately 22 meters (72 feet) of piping.
Additional note:
Does the 3-liter rule "from the hot water generator (fresh water heat exchanger) to the last outlet" refer to the circulation pipe from the fresh water source to the last fitting in the most distant apartment, plus the branch pipe to the most distant outlet within that apartment?
Would this be about 22 meters (72 feet) for a 15mm (0.6 inch) pipe?
Or does it include the entire circulation loop plus one branch pipe to the most distant apartment/outlet?
For example: For a 15mm (0.6 inch) pipe, this would correspond to approximately 22 meters (72 feet) of piping.
Additional note:
Does the 3-liter rule "from the hot water generator (fresh water heat exchanger) to the last outlet" refer to the circulation pipe from the fresh water source to the last fitting in the most distant apartment, plus the branch pipe to the most distant outlet within that apartment?
Would this be about 22 meters (72 feet) for a 15mm (0.6 inch) pipe?
Or does it include the entire circulation loop plus one branch pipe to the most distant apartment/outlet?
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