thescruff
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from Which guide.
Water and washing machines
Some washing machines are better than others at saving water.
The average washing machine uses 10 litres of water for every kilogram of cottons it washes on the standard 40oC cotton program. But during our washing machine testing, we found that water usage varied between models, ranging from one that used just 5.5 litres of water per kilogram to another that consumed 13.6 litres of water per kilogram.
Looking at standard 7kg-capacity machines as an example, the most water-efficient 7kg washing machine we’ve tested used just 5.9 litres per kilogram and the worst used 12.8. If you use the standard 40oC washing program four times a week for a year, filling the drum to 80% capacity, the difference in water used amounts to 7,967 litres of water. That’s nearly enough water to fill 100 baths.
The table below shows the best and worst washing machines we've tested in terms of water usage for a 7kg machine, filled to 80% capacity.
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