Pellets... yeah, you need a fireproof room for that, right? This should then be near the heating system and of course the chimney. Ideally, the room should be street-facing, so that they can easily reach it with the car and the hose. Should that stuff go into the [Technikraum]? I would swap [Hobby] and [Technik], that way you have the chimney right there. But it then needs to be a bit thicker, because you need 2 flues. One for the fireplace, one for the heating.