The Baxi complete assembly heat exchangers are two different types of heat exchangers that can be installed, the primary heat exchanger and the secondary heat exchanger. The primary, which is found in almost all boilers, enables heat to be transferred from the burner to the water inside the system. The secondary heat exchanger, which is only found in combination boilers, enables the transmission of heat from one closed system to another.

• Compatible with Baxi HE Plus, Solo HE, Main HE and Potterton Promax HE Plus