I never use warm water to defrost the car. If it’s cold enough it’ll either re-freeze on the road/drive where it was parked or re-freeze on the windscreen.
Transit has heated windscreen, by the time I’ve de-frosted the side windows it’s ready to go. Find it very useful with snow too if the bottom layer has frozen. Two minutes sitting in the cab and all the snow brushes off easily 🙂
Jags have them too. Thought I saw it on the spec sheet of the one I bought but realised a few days after buying it there were neither heated front screen or seats. Was completely gutted but a 4.2 V8 doesn’t take too long to heat up! My neighbours love to hear it being rev’d up early morning to build the heat up (I don’t do this as I have mechanical sympathy but what a great way to wake everyone up!!).