Is a local space heater, which is marketed as an outdoor heater, but which includes information on how to install it indoors in the scope of the Regulation?

Yes. When the installer manual or any other material (online or not) concerning the local space heater indicates that the product can be installed indoors, it is in the scope of the regulation.

_{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.}