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The more power per year a device consumes, the less energy efficient it is, making it more costly over time.
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Machines which use less water are good for the environment and can save you money in utility bills.
With a transparent door you can look inside the machine and see what laundry is inside.
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.
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.
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.
With a wider range of programs to choose from you can be more specific and choose the best, most economic program for your needs.
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.
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.
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.
The machine will analyse how much heat is needed in order to dry each specific load, therefore increasing efficiency and saving energy.
The machine will let you know when it is finished with an alarm or even by playing a tune.