This page is about "whats up right now".
The newest will be on top, so if you read from buttom up, you get a history like in a blog.

8. 2014
So how did it go with our condensate experiment ?
Well - its rather predicable, that not everything goes the way you expect it in an experiment.
If it did there was reason to make it ;-)

Here you se the "set-up" in our lab.
The Gymse-stove was build at last years work-shop, but at the other end of the room, so it could be connected to the chimney.
This year we toke it down, and rebuilded it here, since we didnīt needed the chimney.
The "chimney" is now the blue bucket you se behind my good colleg and friend Jens.
In between you se a steelpibe, where we hoped to release enough heat to get to condensationtemperature.
That the first part of it is very dirty shows, that we didnīt quit got to that, and therefor tried to cool with wet claymortar.
In the bucket we have water in the buttom, and burned claynuts (Leca) above.
A little pump moves the water to the top and spray it over the Lecanuts, so they are constantly wet.

The vertical tube is turning around when the pump is running spraying the water all over.
(I had a litlle film showing this, but cannot make it work on this iMac :-(((

The smoke is going in near the buttom, and have to go through this wet environment with a very big surface.
It makes some resistance of course, but not much. Gymse could allmost pressure the smoke through by itself, but only allmost.
So a lid and a little ventilator helped.

As you can se here, a little steam evaporated, so the condensation was not complete, but since the stove was new and very wet, it might increase by time.

When we started to fire the stove, you could smell something like a mildly smoked sussage if you put your nose in the steam. Not unpleasent at all :-)
Later, when the fire burned clean, we could smell allmost nothing. (The door was open, because we wanted to cool down the pibe as much as possibel, not because of the smell).

Messuring was a serius problem.
If it was Jensī equipment (same as my own, that just was in Catalonia), or just too strange input for the equipment, is hard to say, but the results was not reliable.
Temperature on the output we could trust, and that was going from 20 to 40 degrees Celcius during 2 hours of firing. Cooling the recirculated water would surely help.
Co was extremely low (expected), but since the oxygencell seemes to fail, we could not calculate the efficiency.
Particles we could not messure, but honestly - how much do you think will pass through this very wet environment with water going downwards ?
So i have to repeat the experiment, and only make the changes we could se would be appropiate (better cooling).

Never the less -
We had fire in the stove for 2 evenings, just for the cosiness, and we let out the "smoke" in the same room where we where. No problem at all :-))
Of course this is not recomendable in a tight house, but this is not the goal either. Only to reduce the pollutant of PAH and particles as much as possibel, and that part of it im sure we got very close to.

We allso had a lot of fun.
Who can make the biggest arch in brickwork with claymortar only with "living support" ;-)))
The participants + the kitchenstaff, was devided into 3 groups with this challenge, and allmost no guidance.

This was the most ambisius team, but when they moved the knees, it didnīt last.

This did, even though it was so much out of shape it could be.

Remark, that Roberts head is still above the arch, so no helmet needed ;-)

3 happy teatchers. L->R Steen Moeller, Jens Andersen, Lars Helbro

Next work-shop might be in Catalonia (northeast Spain), but its not scheduled yet.
Keep updated here, or send me an email on

Of course we will have work-shop on Drejoe next year, and maybe in Australia too.
Hope to see you.


International Work-Shop in Denmark 2014
21-28 of june at Nygaarden Drejoe as usual.
This year we begin with a party :-)
One of the participants bring his band, so be sure to arrive in good time saturday.

Besides learning about - and building stoves, we will try out a new tecnic, to make these stoves work without a chimney.
We will condensate the smoke, wash it, and only let out pure Co2.
At the same time this process will bring up the overall efficiency to about 120%
To do so, we will need a little electricity, but we will let the stove itself produce this by a thermogenerator.
Sten Moeller from Freeland will be the co-teatcher at this project.

A good friend and a colleg of mine, Jens Andersen, will bring a stove of his own kind.
He build stoves very different from me, so this is a chance to se how they look inside.

So we will have a lot of activities this year, and we still have room for more participants.
Price: 1000euros all incl.
More info or sign up:
Send me an email:

September 29. 2013
Winter is coming up in Denmark, but here in Catalonia its still what i would call a really good summer.
I begin to miss a good fire though.
My girlfriend and i are moving from a flat in town to a big old house in a village called Vilopriu.
For most locals here, its just an old house, but to me its amazing, and for several reasons.

First of all, i look very much forward to build some stoves for myself again, and i will have plenty of uppertunities in this house.
800m2 (8600sqft) in 3 floors. Separation between the floors, and all staircases are made in catalan vaults, so its very strong, and i can build my stoves whereever i want to.
Catalan vault, whats that ?
Take a look at this: