This part is also known as the primary heat exchanger or heat engine and allows all the heat from the burner to transfer heat to the central heating water safely. It sits at the top of the Ideal boiler in non-condensing boilers and is located in the centre of the Ideal boiler in newer energy efficient boilers.
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Ideal 173240 Mini Europa Heat Exchanger (Main)

Part: 173240

Price: £305.39
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Ideal 172516 Main Exchanger Con.Clip (Bi1172 101)

Part: 172516

Price: £3.96