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Identification plate. The identification plate of your Vaillant ecoTEC pro boiler is attached at the factory to the underside of your boiler. Vaillant Boiler Manuals. Shown below are boiler manuals. You can use the search box to speed up finding your particular boiler manualListed below are all the manuals for Vaillant. Just click on the model or the Gas council number and the manual will download at the bottom of the page. Listed below are all the Vaillant USER manuals. Just click on the model or the Gas council number and the manual will download at the bottom of the page,