Mark,
You raise a good point - US washers run on 110V.
For decades, European Dishwashers and Washers on the high-end offered the option of running either at 10 or 16 amps (I should say running 'on' those fused circuits) at 220/230/240 Volts or running at 3φ.
Given how widespread 208/220/240 circuits are in laundry rooms in the US, I wonder if we shouldn't make that an option. It would enable real water heating in reasonable time-frames. As Laundress has reminded us many times over the year, you can trade (to some extent) heat for time, water volume for detergent efficacy, agitation for soaking, etc. to achieve the same results. Within limits.
I still can't help but feel all the HE TL problems are insurmountable. If we want to talk about low water and energy use, then TLs in the traditional style just don't come close to good HE FLs.