Here are a few pictures of the unit in use:
The top thing is the water gauge, it looks like it should be filled.
The coil lever is for the dampener.
I have just put this new wood on after a 10 hour burn, see how the wood is black.
Can you see underneath where the log is still unburned, it is very efficient.
What to look for in a stove link here.
This is a good link for how it works to heat the house.