Really a pity I did not have my camera....
The bench is several meters long.
This stove has no barrel but the rest is like a rocket stove!
How can it be? There is little rise and no push from the up and down of the smoke in the internal chimney + barrel...
The mouth feed is horizontal and the elbow reaches an iron plate which is for cooking.
So the smoke is automatically directed to a pipe starting from the side, and going along in the bench.
The pipe is made of used olive oil cans that have been welded. So it is rectangular.
I put my hand in the mouth feed and felt this pipe directly there.
At the end of the bench, there is an elbow and a chimney, that I did not looked at for diameter.
All this is outside and just under a roof with walls on 2 sides, and the gases are not going much higher than the roof.
It has been used regularly, though they do not remember is it was smoking at the start (because it does not matter so much).
The bench is warm after 2 hours no more, and even too hot near the fire.
This man also makes cubes with the L shape inside, just for cooking, and I was familiar with this.
But he uses the same the a bench and for heating, not only cooking!
Xisca - pics! Dry subtropical Mediterranean - My project However loud I tell it, this is never a truth, only my experience...
The draft is likely due to the semi-normal vertical chiminey near the far end of the bench, as described. It's not possible that this setup is nearly as efficient as a RMH though, and the build up of creosote in the bench will eventually be a hazard or a draft restriction, or both.
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
Xisca : Based on the amount of information you have given us so far it sounds like the Ancient Roman in floor heating system, the hypocaust! Which reached its height between
Julius Caesar's invasion of the British Isles and the fall of the Roman Empire, and mostly used in those Northern most outposts !
The Indigenous people of the Korean Peninsula ( and parts of China , Siberia, and Japan ) also had in floor heat from such a system.
As Creighton says there was always the problems of potential creosote fires, and of course leaks of odorless carbon monoxide !
Some times the mighty and highly exalted Ninja would block up the exit flue, and take care of however managed to escape the building ! Any Pictures ? Big AL !
Success has a Thousand Fathers , Failure is an Orphan
a build we did with no barrel. We did test the exhaust with a gas analyzer and used an 8 channel data logger for all the temperatures. The efficiency was very high and emissions were very low. It removed all the heat without a barrel. it does use a standard rocket heater style j-tube combustion system. It does need a chimney.