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Challenge / Goal

The main objective of Cologne’s Demonstrator is to recover heat from sewage water and use it in decentralized local heating networks by supplying heat and DHW to local school buildings.


The CO1 demonstrator consists of three different operation sites; Wahn, Mülheim and Nippes. In all sites, sewage source heat pumps recover heat from sewage water. The main components of the system are: heat exchangers, water-to-water heat pumps, gas boilers and heat buffer tanks. One innovative part of the demonstrator is the heat exchanger, which is installed inside the sewage pipe. This indirect heat extraction technique is used in two of the demonstrator sites (Wahn and Mülheim). In the third site, a direct heat extraction technique is used. This means, part of the sewage water is by passed and pumped direct to the evaporator of the heat pumps.


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Time period

Planning time: 2 to 5 years

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