1. Alliance Laundry Systems seems to offer various models SQ (or Unimac) washer with heating capabilities.
https://alliancelaundrysystems.wide...-1001_SpecSheet_SC70-DAM7_en-EU.pdf?x.share=t
https://www.manualslib.com/manual/3180967/Alliance-Laundry-Systems-Sc70.html#manual
https://www.samstores.com/product-speedqueen-sc30-washer-10349.html
Then there are various commercial washer/extractors both hard and soft mount that can be set up to use steam for heating.
2. "But I still wouldn't want to trade true 140F+ washing for anything - but that might just be my EU bias."
Testing done by independent sources in EU early as 2013 (if not prior) showed good number of domestic washers failed to reach and or hold set temperature. This especially at 140 degrees F and above.
Suppose it falls under "what you don't know doesn't hurt you". Manufacturers of such machines don't believe owners will check or even care.
Older washers from Europe most certainly did reach and hold selected temps. My Miele W1070 will not only get water from near freezing to 200F, but will turn heater on again if detects set temp drops below that level. One knows this because there is a quite audible *thunk* sound when thermostat engages heater, then again when heater is shut down. Miele washer will heat water at any point in cycle (even past heating portion) up until and or just right before washer goes into rinse.
3. Never, ever, ever start washing with hot water. It cooks proteinous soil (that all laundry that has come into contact with a person) is fouled with, making it difficult to remove.
In many ways it was a sad day laundry wise when American households moved over to automatic washing machines. Prior to this whether manually or with semi-automatic washing machines whites/colourfast and other things that required a hot wash were presoaked or prewashed in cool or cold water. That took care of protein based soils before the orgy of hot and boil washing followed.
Yes, some fully automatic washers offered pre-wash or pre-soak cycles, but not everyone used them. People just bunged wash into machine, set it for "hot" wash and that was it. American's love affair with chlorine bleach covered a multitude of wash day sins, and one of them was bleaching out stains or soils that would or could have been removed by doing a cool or cold water prewash or soak.
4. SQ washers at local laundromat have different tub vanes than what one sees in their domestic cousins. They are rather large nearly solid bars that produce rather strong wash action. One can hear (and often feel) washing being lifted and slapped down against tub or itself with great force.
Four pieces of wash day pie are; Mechanical force, chemicals, water temperature and water level. One can move things about to achieve same results as all things being equal. Thus if SQ front loaders have stronger mechanical wash action then that will compensate (to some extent) lack of higher wash temps. Keeping in mind also modern laundry detergents work quite well at temps of 100 to 104 F.