1. YOUR DISHWASHER USES LESS WATER THAN HANDWASHING. Your sink uses 4 gallons of water every 2 minutes, while your dishwasher only uses 4 gallons for one cycle. That means you'd have to wash all your dishes in under 2 minutes to be more efficient than an ENERGY STAR certified dishwasher.

What uses less water dishwasher or by hand?

It may feel more virtuous to wash by hand, but it's actually more wasteful: You use up to 27 gallons of water per load by hand versus as little as 3 gallons with an ENERGY STAR-rated dishwasher.

Is it cheaper to use a dishwasher or wash by hand?

Conclusion. The evidence is clear—a dishwasher is far more efficient than hand washing dishes. It's safer, faster, and cheaper than even the most frugal method of hand washing.