Whether you heat the water in the dishwasher or in an instant water heater, it's still going to be the same amount of electricity for the same cost. I think in

Whether you heat the water in the dishwasher or in an instant water heater, it's still going to be the same amount of electricity for the same cost. I think in the US people might heat water with natural gas, which is cheaper, but that's not really the case in most rental apartments in Germany.