Here in Japan, no dish washer have dedicated cold intake because it's nonsense. Usually hot water on kitchen can't be too high because it's pre mixed. It seems

Here in Japan, no dish washer have dedicated cold intake because it's nonsense. Usually hot water on kitchen can't be too high because it's pre mixed. It seems that some US model has both. Could faucet on kitchen in US supply too hot like 80C water? Hot water supply should be available in nearby dish washer because it's on near kitchen sink (but YMMV). So no complexity added compared to cold water supply. Yes I agree even only electric heater is used, it won't charge much higher electricity bill, but plugging hot water pipe is still efficient.