In the Erlenmatt Ost development, the Habitat Foundation is firmly committed to affordable housing and a forward-looking, sustainable energy concept. Between 2016 and 2018, a total of 109 Joulia Inline shower systems (3- and 5-pipe) were installed in several multi-family buildings. In addition to photovoltaics, wind power, power-to-gas, and ice storage, heat recovery directly during showering makes an effective contribution to permanently reduce hot water and energy consumption and significantly minimize the CO₂ emissions of the neighborhood development.