Looks like a medium to me too, but pictures can be, well you know...
Does the baffle get red when it's that high.
Ours doesn't say pipe on it, so I figured it may be illegal to put it on the pipe

.
I actually have a security brand double walled pipe that has slits/vents/holes(?) in the top and the bottom of it, I got that to let more of the heat out of the pipe into the house. If you put your hand near the slits on the top of the pipe, you can feel the flow of heat out of there, so I'm guessing it does help. Since our place is a doublewide and code is double walled

, I figured this would be the best route to utilize the heat as a single wall would without breaking code and making the pipe safer for kids.
Yep, ours says about 275-575 for the burn zone. When I first installed it I was trying not to go over that, I learned real quick that it would go over it with a good sized load even with the damper shut down. One time I had it loaded up with a bunch of smaller locust branches that were real crispy dry, man did it get going quick, and hot. Most times when it's below 30 if and I have a nice coal bed, then I fill it with a nice load of locust, let it rip for 12-14min, the stove will be up to 500, then I shut the damper and it will go up to 600, higher if it's colder outside like now.