Energy from Wastewater

Wastewater contains thermal energy, and we can recover some of this energy with heat pumps.

With our HUBER ThermWin system for heat recovery from sewage we withdraw sewage from the sewer, screen it, pump it through above-ground Heat Exchangers, and then return it back into the sewer.

Because we screen and pump the sewage, we can use compact and cost-effective heat exchangers, wherein we generate a well-defined and turbulent flow for efficient heat transfer.

For screening we use a vertical screw screen HUBER Pumping Stations Screen ROTAMAT® RoK4 that is compact and lifts the screening through its vertical auger. Returned sewage flushed the lifted screenings over a chute back into the sewer.




  • Efficient use of renewable and sustainable energy
  • Unlimited availability, secure supply
  • Local and free, decentralized heat source
  • Cost-effective from a dry weather flow of around 10 L/s
  • Negligible effect on wastewater treatment (sewage cooling by 1 – 2 °C only)
  • Independence from sewer size
  • Use of compact, efficient and cost-effective heat exchangers
  • Heat exchangers above ground (easy access for installation and maintenance)
  • Little construction work (narrow manhole beside sewer)
  • Minimal interference of existing sewers (only drilling of two holes)

Case Studies