What kind of temps to you get with the blower off? Last night I loaded mine up for the night with 2 large splits and one 4" round of Ash. Had the air almost closed. After about 1/2 the tea pot whistle was really blowing so got up and stove top was 700 and climbing. With the blower on high it sill stayed at 600. After about 3/4 hour it was down to 500 so got to go back to bed. You should have no trouble hitting 600 to 700 with the blower off.