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Last edited 06 Feb 2020
A dead leg is: ‘The length of pipe to the outlet in a hot water system. When the outlet is not in use the hot water in this pipe loses its heat so when next used there is a time delay before fully hot water is again available at the outlet. This represents an inefficiency of the heat system.’
Ref Climate Emergency Design Guide: How new buildings can meet UK climate change targets, published by the London Energy Transformation Initiative (LETI) in January 2020.
 Related articles on Designing Buildings Wiki
- Climate Emergency Design Guide.
- London Energy Transformation Initiative.
- Building heating systems.
- How to prevent frozen pipes.
- Mechanical, electrical and plumbing MEP.
- Pipework defects, ventilation and airflow rates.
- Plumbing drawing.
- Sanitary pipework.
- Underfloor heating.
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