Common sense......
wash all your loads in COLD water, and then run a CleanWasher cycle in HOT......where are my savings...
many of these new machines are already constructed to know if you hook the HOT water to the COLD water side of the valve.....it will shut down on you, and an improper installation is not covered under a warranty...
these machines have already been built and are in use as we speak, just not noted on the control panel, most temps now are so dubbed down, people don't care, they load, push the button and walk away.....
oddly enough for the ones who wash in cold water, most use a dryer, most are electric......again, where are you saving?...
most of my life I washed in WARM, just to get good results as well as save some money......when the Neptune came out, it allowed me to wash in HOT almost all the time, whats 3 gallons of water?....
people complain of longer wash times for these HE machines, that's only built in for COOLER temps to remove stains, it needs a longer activation time, versus if these machines washed in true Warm/Hot temps, the cleaning would happen sooner...
these machines would be great for a Landlord situation...when people aren't paying for it, they will wash in all HOT water....a full tub to wash one piece of clothing....