Vaillant 0020246710 heat exchanger

A Vaillant replacement heat exchanger for the repair of ecoTEC Pro, ecoTEC Sustain and ecoTEC Plus boiler units. The heat exchanger transfers heat from a boiler's burner to water. A primary heat exchanger is found in all boilers, using heat from a burner to raise the temperature of the water in the system while a secondary heat exchanger is present only in combis and allows the heat to be transferred between closed systems.