Condenser dryers extract the water from the damp air in the dryer and store it in a container. They are good because they can be put anywhere in the home whereas vented dryers should be next to an outside wall.
With a delay start option you can schedule the machine to begin at a later time. You can also set the machine to wash at night if your electricity is cheaper outside of peak times.
With a bigger drum you can fit in larger items such as duvets, or do a big load at once.
With a lower noise level for drying there is less disruption and you could use the dryer at night.
With an anti crease spin the machine gently rotates to shake out creases.
The machine will analyse how much heat is needed in order to dry each specific load, therefore increasing efficiency and saving energy.
More weight capacity helps if you want to wash something heavy like curtains. A traditional household machine can hold around 6kg, so with a machine much bigger you may waste energy using it when only half full.
With a wider range of programs to choose from you can be more specific and choose the best, most economic program for your needs.
A two way tumbler spins in two directions. This is good for efficient drying and for untangling the load.