Vaillant 0020195461 heat exchanger

A Vaillant replacement heat exchanger for the repair of ecoFIT Pure, ecoFIT Sustain, ecoTEC Plus and Home boilers. 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.