WORCESTER 87161201220 ES 25-OSV HEAT EXCHANGER SPARE ASSEMBLY.
Heat exchangers can be split into two types, primary and secondary. The primary is present in most boilers and can sometimes be referred to as the main heat exchanger or heat engine. The secondary heat exchanger is only required in combi boilers and can also be known as a plate heat exchanger or hot water heat exchanger. The primary heat exchanger is used for transferring heat from the burner to the water in the system. The secondary heat exchanger allows heat to be transferred between one closed system and another .
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