Remember, friends don't let friends ruin unpasteurized cider by sticking it on a stove and spicing the hell out of it. Only do that with pasteurized cider; it was already ruined when you bought it.
Or are you asking about sanitation? I'm using the word "pasteurization" colloquially to mean "heat pasteurization". UV-treated ciders typically still retain the flavor that heat pasteurization destroys, unless the brand just happens to suck regardless.