How to heat pork back ribs?

Hey guys! I have tony romas pork back ribs. The ones that's already cooked you just have to heat it. My mom did it last time with a crock pot which is really the only way I can do it. It's causes the least amount of noise since it is 11:00 PM on the east coast and I'm just craving some ribs. IS it as simple as putting it in on high until it seems hot enough or what. I can do this for up to like 5 hours, I don't care I want these ribs. Thanks guys!