If you don't have enough space for a washing machine and tumble dryer, then a washer dryer is just what you need. When choosing a washer dryer you need to look at the wash performance grade and the energy efficiency grade. These are graded on a scale of A-G, where A is the best. A more efficient appliance may cost a little more to buy, but will probably be cheaper to run, so you could end up saving money.
The maximum spin speed is important because the faster the spin speed, the more water that is removed from your clothes. The maximum wash load, the drying capacity, and whether the machine has a specific half or light load option may be of interest to you if you do not generally have standard loads of washing.
You may want to make sure your chosen machine is capable of hand wash, delicate wash, quick wash, wool programme, silk wash, cotton wash and pre-wash. Other features to look out for are a wide opening door, automatic water level control, hot or cold fill, easy iron programme, water consumption, out of balance spin protection and a time remaining indicator.