Pepper X's Scoville rating is reported to be about 2.7 million Scoville heat units (SHU) while the Carolina Reaper's rating is ranges from 1.4 million to 2.2 million SHU, with a median heat of 1.8 million SHU. So on paper that math pans out. The Carolina reaper can reach up to 2.2 million on the Scoville heat scale, while the ghost pepper reaches half that heat (around 1 million SHU). What are Carolina Reapers? Holding the Guinness World Record for being the hottest chilli pepper in the world, the Carolina Reaper (also known as HP22B) has an average Scoville Heat Unit (SHU) rating nZYd.