Product Information: There are two different types of heat exchanger that can be installed, they are the primary heat exchanger and the secondary heat exchanger. The primary is present in almost all boilers and uses heat from the burner to raise the temperature of water within the system. The secondary heat exchanger only appears on combination boilers and allows the heat to be transferred between 2 closed systems.
This part is listed against 2 boilers on our website, The Worcester CDI 28 FSP COMBI, CDI 28 FSN COMBI.