Société wallonne des eaux (SWDE) is pioneering a new approach to water use in Wallonia, Belgium through its Aqwario project. The initiative reimagines existing water infrastructure — including reservoirs, pipes, and wastewater treatment plants — as sources of energy. By recovering heat from these networks, SWDE can supply buildings with heating or cooling, using processes known as aquathermy and riothermy.

The project recovers water heat at a stable temperature and transfers it to water-to-water heat pumps via a heat exchanger. This creates a reliable, local energy source that is less exposed to fluctuations in the energy market and can operate consistently throughout the year. 

Aqwario demonstrates how existing water networks can deliver multiple benefits. It helps reduce carbon emissions, supports the energy transition in Wallonia, and gives added value to public water infrastructure. Buildings located near reservoirs, wastewater treatment plants, or large pipes could be suitable for an Aqwario project, making it a practical step toward sustainable energy solutions.

Read more about Aqwario project here.