How Hot is a Thai Pepper? Because of the wide variety, Thai peppers typically range from 50,000 to 100,000 Scoville Heat Units. Compare this to a typical jalapeno pepper, which ranges from 2,500 to 8,000 Scoville Heat Units, making the average Thai pepper about 15 times hotter than the average jalapeno.
 
The Thai chili has a very similar taste to the Serrano, just with a higher heat level. It has that berry-like flavor without the sweetness, and if you bite directly into one of these it definitely delivers an explosion of heat. I tend to use these in place of a Serrano if I want to amp up the spice a bit.