WWHR (Waste water heat recov.)

Proposed method for calculation of system energy requirements and system efficiencies

Geographical scope:
(EP) Calculation procedures
Published date:
May 12, 2023
Updated date:
Sept. 22, 2023
  • Heating systems
  • Domestic hot water systems
EPB Center


This proposed calculation method covers the required input data and calculation procedures to assess the energy performance of a system to recover the heat from the waste water of a domestic hot water system.

In the context of reduced heating needs due to the increasing level of building insulation, the energy use for domestic hot water has an increasing role. Waste water heat recovery (WWHR) is a technology that allows to cover a significant part of the domestic hot water energy use with heat recovered from the shower drain.

Download proposal: How to evaluate the energy performance of Waste Water Heat Recovery - Calculation module related to instantaneous WWHR 1011.9 KB

Acknowledgement: This proposal has been developed by the EPB Center with the support of the European Copper Institute (ECI) and the European Association for Wastewater Heat Recovery (WWHR Europe). 

More information