Question: how many kwh does a dishwasher use?
Answer: For starters, dishwashers run on electricity. This report estimates that a dishwasher unit uses somewhere around 1.5 kWh on average to run a load of dishes, excluding the costs of the incoming water. That's a cost of about $0.17 or so in the average American home. There's also the startup cost of owning a dishwasher.