Does it have to be made clear that the energy efficiency class of a package in an advertisement is related to a package and not a product?

In the case of a package, both the classes of the heater and of the package have to be indicated. If multiple classes have to be indicated in advertisements, it is necessary to indicate which class refers to what.

^{Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.}