Given that they are scaled-down, they also don’t need a pump for automated drainage. As for other desiccant dehumidifiers, they don't require a reservoir tank or drain hose for that collected moisture. Having said that, commercial desiccant designs do have to be ducted outdoors or by way of multiple rooms https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/