I think the idea is that you're heating up water anyways [for laundry/dishwashers], you might as well get power out of it. It's kind of the same principle as if

I think the idea is that you're heating up water anyways [for laundry/dishwashers], you might as well get power out of it. It's kind of the same principle as if you're using an electric heater, you might as well run a bunch of bitcoin miners that generate heat to lower the amount the heater has to be on, since they're both resistive loads. And with the miners, you get some coin as well.