Considering that They are really smaller, they also don’t have to have a pump for automatic drainage. As for other desiccant dehumidifiers, they do not require a reservoir tank or drain hose for the gathered humidity. However, commercial desiccant models do have to be ducted outside the house or as https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/