We lit one of these:
And it was very hot. Too hot. Something was wrong. The pipe was glowing. It shot an ember out the side onto a highly contentious and flammable object.
The stove pipe is beyond old, and yes, we rent. It looked pretty bad.
But then it turned out to be worse than I thought. Really bad.
The house did not burn down, but this is pretty much how I spent the day when I was not having a panic attack.