First, let’s review the description of your device! In all cases, buy the quality indicated in it for your device. The Manufacturer has designed its product for that quality, it can only operate really effectively with the designed quality.   In general, pellet burners with movable grate design can operate efficiently with both A1 and A2/mixed pellets. In several cases, it is also possible to choose the quality in the setup parameters. Nevertheless, a trial burn is recommended before long-term use of A2 quality.