What should the variance be? I got a new Quad 5700 late last season. Just started it up last week and have Condor Stove pipe gauge with probe and Condor Inferno Stove Top gauge. The pipe runs about 150-200 degrees hotter than the top. At start up this morning it was about 500 degrees hotter at the stove top was at 1200. I bought a 5700 for my camp about 5 years ago and it seems that the old style dampers work a lot better than this new acc system. The old system you saw immediate impact when opening a closing the damper this new ones takes longer to see the impact. Just seems to me I shouldn't have all that extra heat going up the chimney, but until yesterday I never used gauges with it so maybe what I am seeing is normal.