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 lower noise level for drying there is less disruption and you could use the dryer at night.
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 an anti crease spin the machine gently rotates to shake out creases.
Some things are too delicate for mechanical drying, so with this shelf you can dry things like sports shoes.
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 sanitize option the machine uses high temperatures in order to kill bacteria.
Machines with auto finish will switch off automatically when the laundry is dry. This will prevent overdrying and save on running costs.
A two way tumbler spins in two directions. This is good for efficient drying and for untangling the load.