Hi, I know this is an old post but I am SO fed up with seeing Boilers fitted to Aircrete Blocks. The answer to your question is NO a Boiler should not be fitted to to Aircrete blocks.
You can get Low Density blocks (2.8 N/mm2 to 3.5 N/mm2) Medium Density (4.0 N/mm2) and High Density (7.0...