Vaillant domestic hot water 19 plate heat exchanger is compatible with eco TEC VUW (condensing) and Guernsey/Jersey only (condensing) boilers and is supplied with gaskets and screws for fitting. The heat exchanger transfers heat from a boiler's burner to water. A primary heat exchanger is found in all boilers, using heat from a burner to raise the temperature of the water in the system, while a secondary heat exchanger is present only in combis and allows the heat to be transferred between close

Brand Name	Vaillant