I dont use hot but I think it's fair to say that cold water alone isn't actually that great at cleaning windows.
Takes ages to remove bird poop, snail trails, bug poop, pollen spots etc, that's if it can remove them at all. I tend to always have a bottle of neat chemical with me to give windows that bit of extra cleaning.
Hot definitely has its benefits but not for 4 or 5k, when 1 spray of neat chemical will do just as good a job as hot but for peanuts really, just adds an extra few seconds to each job. At under 1k though I think this heater is extraordinarily good value for money. Surely if you want to do the best possible job in the quickest possible time, hot is a no brainer, especially at this price point.
Count me in P F..... thanks