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Nonetheless, this energy source is mostly overlooked in European cities, as portraying and making this potential is no urban standard yet. During its participation in the REFLOW project, Berlin developed a web application that allows urban planners, real estate developers, and architects to identify the locations with the greatest potential for capturing heat from wastewater. \u003C/p>","\u003Cp>Contributing to Berlin’s aim of reducing 70% of its Co2 emission by 2030, the Berliner Wasserbetriebe (BWB), as the largest water supply and wastewater drainage company in Germany, developed in collaboration with further partners, a web application. The app allows users to obtain and manage data relevant for matching the supply and demand of wastewater heat (WWH). The wastewater heat radar is especially interesting for cities, real estate developers, and industrial companies in need of production of wastewater heat. The solution focuses on the increasing interest among European cities to reduce their energy consumption and to implement more sustainable and circular energy sources, which waste water heat is counted as. As data acquisition and visualisation is the first step to achieve this transition and very few cities have developed such maps, simply offering this work to municipalities is in demand. The agency can also offer an integrated solution to realise the city’s WWH potential in line with its carbon and sustainability targets. In addition to developing the map, this would include setting up a team of technical partners, identify potential demand and accompany these in the full process to capture WWH. City planners together with climate and energy departments will be the specific customers of such a solution. \u003C/p>\u003Cp>\u003Cbr>\u003C/p>\u003Cp>The key functions of the application allow the user to either search for a specific address or apply a filter on the estimated heat usage of a property. Through both options, the app checks for a potential match between supply and demand. The user can then see how much potential heat capacity is available at the particular location. The app portrays the overall wastewater heat potential of the building as well as the estimated heat demand of the property and shows how much of this demand could be covered by the wastewater heat potential. Users can show their interest in the building and the more users show their interest in one building, the more likely it is that a heat pump is installed, to facilitate the wastewater heat recovery. 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