In the United States, dishwashers are typically hooked to the hot water line. It is common that our water is heated with natural gas, which is significantly che

In the United States, dishwashers are typically hooked to the hot water line. It is common that our water is heated with natural gas, which is significantly cheaper than the electric heater in the dish washer. As dishwashers reduced their water consumption, (old ones might be 12 gallons, new ones are about 4 gallons), the amount of fill water which is "cold, before the water gets hot" increases. A dishwasher probably adds water at least twice, so that is two cold flushes in that 4 gallons.