The Alpha domestic hot water heat exchanger is Primary and secondary heat exchangers are the two types of heat exchangers that can be placed. Almost all boilers have a primary, which is a heat transfer device that enables heat to move from the burner to the system's water. The secondary heat exchanger, which may transmit heat between two closed systems, is only found in combination boilers.
Fits the Alpha CD28C and CD28X
Technical specification
TypeHeat ExchangerCompatible WithAlpha CD 28 C and Alpha CD 28 XManufacturer Model No1.022221Brand NameAlpha