1,400,000 - 2,00,000 SHU with a median of 1,800,000 SHU
Carolina Reaper is currently the record holder for the hottest pepper in the world. There likely is hotter peppers but they haven't been tested and so, are not officially confirmed.
Carolina Reaper was developed by Ed Currie of Puckerbutt company. It is fruity and I've read that it is the sweetest of Superhots. It has an intoxicating aroma that fills a room.