After getting many suggestions and advices, thank to all of you, I figure that my gauge temp became inefficient I have to say it was 20 years old. It was just not getting higher than 400F. Anyway problem solve . I got a new gauge Imperial that has a different system and is more realistic with the reading. I load yesterday , put the gauge on the top of the insert and after an hour of burning, I got a reading of 625 F. It ran for about one hour at that temp and it cruised at 500 F for 3 hours and then slowed down to 300F after another 3 hours. So , I think all is fine and I am getting more accurate reading. Regency claims a burning period of 8 hours and that is close enough for me. A few pics , back and front of the gauge. Home Depot , $28.99.
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