It takes very little energy to run the pump in the dishwasher.
It takes a lot more energy to run the heater.
When in eco mode, the washer isn’t running the heater, and only uses one small volume of water to wash and a small volume to rinse. It just uses it for longer.
When in regular mode, it’s preheating the water and not reusing it, so it wastes electricity and water.
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