Hey, now I'm psyched because last night I got the coal started at about 10pm and it kept burning until I left this morning at 8AM.
I simply added more coal. I also dampened the fire some before going to bed so that it wasn't burning so wicked hot. Wow, this stove will cook you out of the house!
My stack temp, measured with a magnetic stick on thermometer on the stove pipe about a foot above where it leaves the stove is reading 400. That seems hot to me. I called the company and they said that stack temps should not get over 300F. But (of course) I forgot to ask where they measure it.
But I'm still wondering about the bi-metal thermostat which can be bought and put on the back. How does yours work, Grizzly? Do you have to plug it in, or does it work like a baro damper?
bono answered correctly about the bi-metal thermostat. I will elaborat a little bit. On the back of my stove neer the top is a metal box with a length of flat spring steel made of two different aloys, one on the top and one on the bottom. When the spring gets warm, the upper of the two metals in it expands much more that the bottom causing the spring to bend downward. A light bead type chain attatches to the spring and hangs down the back of the stove and attatches to a tin flap about 4"X4" square. As the spring bends down, the chain lowers the flap over a air draft hole in the bottom back of the stove and reduces the flow of combustion air, causing the stove to cool. Cooling causes the spring to bend upward, pulling the chain and the flap upward, exposing more draft hole, causing the stove to burn hotter.
The amazing thing about this simple setup is how evenly the temperature of the stove is maintained. The metal box the spring is in has no bottom, so room air temperature also affects the action of the spring. Ultimately the adjustment is taking into consideration both stove and room air temperature, and maintains greater consistancy than the computerized thermostat on my Toyostove space heater.
I am not sure an add-on would be engineered to work as well as the Hitzer set-up, but I think if you have a draft that can be regulated by this method (most coal stoves don't appear to have) I think it could still keep you in a reasonable range of temp control.