OK like you all, I've been trying to determine the correct burn temperture in my Regency I2400... Stove top temp... Answers range from 200+ to 500 to more... So I wrote Regency and asked them for the word on what a stove top temp should be, with a magnetic thermometer, on my Regency I2400. They responded quickly (great customer service!): Thank you for you for your e-mail and time to visit us on line. There is no good place to locate the thermostat. If you happen to notice the air tubes glowing red constantly, then the insert is being over-fired. They will glow for a little once you start a new fire and possibly when you reload with fresh wood. The I2400M can have a good roaring fire and heat very well, just watch the air tubes, a good sign of a proper burn is after you have reloaded with fresh wood, let it catch for about 15 minutes and then start to damp down, you should notice the air tubes look like several blow torches. Learned 2 new things; 1. glowing air tubes are not a good thing, 2. still no "correct" temperature via thermometer.