Having had four different dryers and combos in my scuba diving
shop I can explain some different.
First off here in Norway
we have all big brands but don´t remember brand name on them.
The "ventless" combo, uses water
as somebody explain beforehand for drying and very little heat and absolutely no humidity in the room.
The "normal" combo, uses air to dry and gives very much heat but little humidity do to the fact that they have plates that the collect water
In my experience the "ventless" combo give much dryer clothes and also dry at lower temperatures for the clothes.
For both types the max washing
was 6 kg (dry clothes) and drying 3-4 kg.
As to water and power consumptions as I said this was at work and never a problem.