User Manual GE GTDS560EF0WS 7.0 cu. ft. Capacity Electric Dryer 

The biggest advantage of a washer-dryer is that it takes less space. However, a separate dryer will be able to dry more than a washer-dryer. A washer-dryer also uses relatively more energy and requires more time.

Appliances that require large amounts of power, like a dryer, can not be connected to all extension cords. See what the power usage of the dryer is, which is indicated in Watt, and check if the extension cord can handle this. There are extension cords with thicker cables that are made to handle larger appliances.

In general it is possible to directly stack a dryer and washing machine directly on top of each other. This only works with front loading models. However, it is advisable to use a fitting accessory to do so. This will prevent the machines from vibrating and falling off and also prevents damage to the bottom machine.