I have the Kenmore 41003 4.5 cu. ft. Front-Load Combo Washer/Dryer. Sadly, it is still waiting for me to hook it up. It is my understanding these two machines are very similar, maybe even made by the same company (or that was the case with one of the LG machines - can't remember the exact model). That said, I am far from an expert and it is has been many months since I purchased mine so most of my research is probably lost due to low quality brain storage cells.
The research I did convinced me that these residential machines operate on a much higher level than the RV ventless dryers. I believe the term is Condenser Dryer. Basically, the dryer air is cooled in a heat exchanger to condense the moisture which is then dumped out the water drain hose. It must work pretty well as it seems these dryers are the norm in Europe and becoming much more common here in the USA.
An important bit for many of us is a washer/dryer that operates on 110VAC (versus 220AC). These do.