Natural draft gassification units?

[maple1]

So I've found info on some Varmebaronen units that do it naturally.

And also Greenwood, but sounds like maybe should stay away from that unit from recent postings.

Are there others?

 

[2.beans]

seton boiler. bunch of them out there. when there run right i don't think there too bad if thats the route you want to go.

 

[woodsmaster]

seton boiler. bunch of them out there. when there run right i don't think there too bad if thats the route you want to go.

I thought seton and greenwood were the same ?