Agree with the temp rise after sealing the ash doors. What is going on (I believe) is that it enables you to lower the exhaust fan speed (because it is doing a better job of pulling air through the burn pot vs through the ash doors) resulting not only in a hotter burn (as evidenced by a number of us seeing less ash build up in the pot), but by turning down the exhaust speed for the same feed rate, you are actually pulling less heated air out of the room. I did not put a temp guage on my stove, but can sure feel the increase in temp. The thermometer I have in the room showed a 3 degree increase at a lower burn rate. My maximum heat I could achieve in my large house went from 67 Degrees to 69 degrees, using just the 5510 and now with no topping off using the propane furnace on a thermostat. So, I'm getting happier by the minute. Still think USSC should figure all of this out for us, vs. us having to play Sherlock Holmes on how to run these things. But, great forum to help solve this. I was getting real disapointed after buying it until I stumbled onto this forum. Thanks for the info to all. Newf27 in the cold Upper Penninsula of Michigan PS: I'm going to go plow some snow with my new BOSS snowplow. Best plow on earth.