The appliance is either Energy Star Certified, or has an EU energy efficiency rating of A++ or A+++. This means it consumes around 20-30% less energy than is required by the minimum local standards for energy efficiency.
A hot water connection means that you can provide the machine with hot water from your main hot water supply. This can be faster than an internal heater and can save money if you have a cheap and efficient water heater.
The more power per year a device consumes, the less energy efficient it is, making it more costly over time.
Aqua stop machines have a special mechanical system which cuts off the water flow into the tub if a fault occurs with the inlet pipe.
Front loading machines are good as you can use the space above and sometimes stack a dryer on top. In general front loading machines use less energy, using less water by only partly filling the drum and obtaining higher spin speeds which clean without requiring as much heat.
With a transparent door you can look inside the machine and see what laundry is inside.
Dot matrix displays can show important text or graphics using a matrix of lights or mechanical indicators like the display on a calculator.
An interior light helps you to see inside the machine.
You can adjust the height of the machine which means that if the floor is uneven you can level it out.
Top loading machines are good because you can load and unload without bending down. In general they have less problems with mold accumulating and on average a wash takes less time. In general they are cheaper to buy and are a good space saving option.
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 faster spin speed means you can get things cleaner with a lower temperature of the water. Using a fast spin also extracts water, meaning that the clothes come out nearly dry. Generally, anything over 1,000 rpm is very good.
Machines with a load sensor can weigh the load and adjust settings accordingly. This means you don't have to feel as guilty about doing a smaller load as the machine will use less water.
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.
During a spin, machines can get quite noisy. With less noise the machine is not as distracting and you won't be restricted to using it at certain times.
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.
The detergent drawer is washed automatically to prevent a build up of old detergent.
A child lock enables adults to prevent or restrict children’s use of the device.
Any faults with your machine can be detected and diagnosed at an early stage with a smartphone. The machine will send a signal indicating what is wrong and how to fix it, without you having to call for help.
The machine is linked up to a monitoring center using Wi-Fi. If the machine has any faults the center will respond by contacting you and helping you to fix the problem.
The machine will let you know when it is finished with an alarm or even by playing a tune.