I have been practicing controling heat on my chargriller. I wanted to control heat on my propane grill to 250 using indirect heat. I turned the two outside burners on and left the middle one off. I placed my oven thermometer over the unlite burner.I turned the outside burners all the way to low, thinking when the grill heated up the temp would be below 250 and all I would have to do was to ajust the burners to reach 250. WRONG. The temp kept climbing till it was above 400. How can I get the temp to 250 and hold if The burners were at their lowest setting? Just trying to learn my grill so I can eat as good as you guys. THANKS.