Product Information: There are two different types of heat exchanger that can be within your heating unit, the primary heat exchanger and the secondary heat exchanger. The primary is present in almost all boilers and it allows the heat to be transferred from the burner to the water within the system. The secondary heat exchanger is exclusive to combination boilers and allows the heat to be transferred from one closed system to another.
This part is listed against 2 boilers on our website, The Alpha CD 32 , HE CB33 .