I would recommend the vented model. I have not had a ventless model but comments indicate they take longer to dry. The vented models use heated air just like a home unit. The ventless models heat the clothes causing the moisture to turn to vapor, then use cold water to condense the water vapor to condense back to water, then drain it out the discharge drain. I can't imagine that being as efficient as heated air.
In spite of frequent comments about humidity, the unit is sealed, the water goes out the drain, and it does not put additional humidity in the RV. Read about it on the Splendide web site.
The WDC7100XC's condenser dryer system requires 2.5 gallons of water per hour during the dry cycle. This is a sealed system that will not add heat or humidity to the surrounding area.
But with the combo you can set it to wash AND dry, put the load in, start it, and go about your business including sightseeing, and come back later to a clean dry load of laundry.
