Polly says:
The heat level of chillies is measured in Scoville Heat Units or SHU. Some are so hot they should come with a Government Health Warning – if you handle these peppers wear gloves and eye protection. So handle with care, proceed with caution.
Carolina Reaper 2,200,000 SHU. (Scoville Heat Units)
Trinidad Moruga Scorpion, 2,009,231 SHU.
7 Pot Douglah, 1,853,936 SHU
7 Pot Primo, 1,469,000 SHU.
Trinidad Scorpion “Butch T” 1,463,700 SHU.
Naga Viper, 1,349,000 SHU.
Bhut Jolokia (Ghost Pepper), 1,041,427 SHU.
7 Pot Barrackpore, 1,000,000 SHU
7 Pot Red (Giant), 1,000,000 SHU
Red Savina Habanero, 500,000 SHU