A more energy-efficient district heating system

In new apartment buildings, the purchase energy of the district heating system can be reduced by up to 50% when wastewater heat is recycled back into the property’s heating and hot water systems. The Ecowec® hybrid exchanger is connected to the heat pump in a district-heated property, reducing the peak power of district heating and the need for purchased energy.

Ecowec wasteHEAT - kaukolämpöjärjestelmä ja jäteveden lämmöntalteenotto
Ecowec Save Energy

With the help of the Ecowec hybrid exchanger, the need for peak power of district heating can be substituted with wastewater heat during winter and almost entirely replaced during summer. This results in reduced energy costs for the property and processes.

Optimize Heat Sources

The Ecowec hybrid exchanger allows for the simultaneous use of multiple heat sources. This way, the heating system can be controlled cost-optimally by choosing either wastewater heat or district heating in desired usage ratios.

Connection Model and Principle

By connecting the Ecowec hybrid exchanger to the district heating system with the help of a heat pump, district heating can be replaced with the heat from wastewater. The energy costs of the property and processes are reduced when most of the heating is substituted with waste heat from wastewater.


The Ecowec hybrid exchanger can also be connected to a partial-load heat pump. The sizing and investment of the heat pump system can be significantly reduced since district heating remains as the primary heating system for the property. Ecowec also allows for the simultaneous use of multiple heat sources. With the heat pump, only part of the building, domestic water, or industrial process heating can be done, leaving the highest temperature levels to be handled by district heating.


The hybrid exchanger and the district heating system’s heat pump are interconnected as depicted in an illustration.