The Worcester Bosch has two different kinds of heat exchangers that can be installed. They are 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 only appears on combination boilers and allows the heat to be transferred between two closed systems.
Supplied with 4 fibre washers
Technical specification
TypeHeat ExchangerCompatible WithWorcester 24I NG FSN COMBI and Worcester 28I NG FSN COMBIManufacturer Model No87161429050Brand NameWorcester Bosch