Wastewater Heat Recovery System Shows Great Potential in Decarbonizing Buildings

Strategic Insights -

Researchers at Rzeszow University of Technology in Poland have found that wastewater heat recovery systems can significantly reduce greenhouse gas emissions and improve energy efficiency in buildings. The study, published in the journal Energies, investigated three different wastewater heat exchanger systems and found that they can reduce energy demand for hot water preparation by up to 64.7%. The research also showed that the tested systems reduced CO2 emissions compared to traditional water heating methods, indicating a great potential for wastewater heat recovery systems in decarbonizing the building sector.

Key Takeaways:

  • The wastewater heat recovery system can reduce energy demand for hot water preparation by up to 64.7% compared to traditional methods.
  • The system can reduce CO2 emissions compared to traditional water heating methods.
  • The study found that the flow rate from the shower head and mixed water temperature have a significant influence on the reduction of energy demand and CO2 emissions.
  • The Life Cycle Cost analysis showed that the traditional water heating method was the least cost-effective solution in all calculation cases.
  • The research concluded that wastewater heat recovery systems have great potential in decarbonizing the building sector.
  • The system's advantages include daily availability, regardless of weather conditions, which makes it a valuable energy source in buildings.

Statistics:

  • Energy demand for hot water preparation can be reduced by up to 64.7% using wastewater heat recovery systems.
  • The tested systems can reduce CO2 emissions compared to traditional water heating methods.
  • The flow rate from the shower head and mixed water temperature have a significant influence on the reduction of energy demand and CO2 emissions (up to 29.6% and 64.7%, respectively).
  • The Life Cycle Cost analysis showed that the traditional water heating method was the least cost-effective solution in all calculation cases (no specific numerical data available).
  • The research concluded that wastewater heat recovery systems have great potential in decarbonizing the building sector (percentage of reduction in CO2 emissions not specified).

Sources:

  • NewsRx. Recent Findings in Climate Change Described by Researchers from Rzeszow University of Technology (A Wastewater Heat Recovery System as a Solution to Improve the Energy Efficiency of Buildings and Reduce Greenhouse Gas Emissions: Technical, ...). Global Warming Focus. October 13, 2025; p 215.
  • A Wastewater Heat Recovery System as a Solution to Improve the Energy Efficiency of Buildings and Reduce Greenhouse Gas Emissions: Technical, Financial, and Environmental Aspects. Energies, 2025,18(18):4818.