Hybrids will commonly have them so they can run climate control independent of the engine (at least until the HV battery gets too low) and also bring coolant temp up faster. It seems like they are usually called the PTC heater or supplemental heater.

Ford also seems to offer them as an option (e.g. as part of the cold weather package)for a number of their straight ICE vehicles like the Bronco sport, Escape, or F-150.