The machines run perfectly fine with cold water entering them. They just consume more energy to warm the water, compare to for example a heat pump. And same, to

The machines run perfectly fine with cold water entering them. They just consume more energy to warm the water, compare to for example a heat pump. And same, to spin fast to remove the water out of clothes is hundred times less energy consuming than to try to make the water evaporate for hours in a dryer. So I'm not talking about if the machines work or if it is practical, just about what's more energy efficient.