Riserless Oven and Bell Heater

[fuegos]

I'm looking again at this great build as I'm currently planning something similar -the community I'm working with were inspired when i shared this thread with them. I was wondering if the total ISA includes the oven chamber?
I'm also trying to work out how the bench works from the photos? i assume that the pipe run is later completed or is the oven chamber just venting into the bench ?
What are your thoughts on how easy it would be to rebuild the core? in my limited experience the central part , the soldier course suffers more than any other zone especially the last brick in the line as any cracking can lead to pieces falling out .I think with your layout taking out the door & frame would give you enough access to replace this part of the core.

[mannytheseacow]

Thanks for your interest, Fuegos. The bench was an afterthought; I initially built the oven without calculating ISA and found that it did not provide much space heating. The bench was then added and I included the oven’s ISA along with the bench to reach Peter’s recommendation for total ISA.
The exhaust exits the stove into the chimney at the top of the oven and there is a bypass located there. The oven is open to the bell and the stove pipe goes from the chimney/bypass to the bottom and far end of the bell.
My intention was to surround that stove pipe in the bottom of the bell with some cob mass but I’m having trouble locating a suitable soil for the cob locally. As is, this is my only complaint with the stove’s performance- without two firings a day the bypass is needed to get the draw primed. I think a little mass around that exhaust pipe would provide the needed heat retention to keep the stove primed… just a guess.
As to the core, yes I think if it needed to be rebuilt it would require a total rebuild. I’m very cautious with my wood loading and would recommend a sacrificial liner if I were building this for a client or community. Still, the beauty of the clay/sand mortar is that a total rebuild would really just be a long afternoon or two- not a big deal.

[fuegos]

"The exhaust exits the stove into the chimney at the top of the oven and there is a bypass located there. The oven is open to the bell and the stove pipe goes from the chimney/bypass to the bottom and far end of the bell.
My intention was to surround that stove pipe in the bottom of the bell with some cob mass but I’m having trouble locating a suitable soil for the cob locally"

so your intention was to build a bench with mass covering the pipes and you ended up with a bell ! I don't know about summer temperatures where you live but to bake year round the bypass isn't a bad idea.

"the beauty of the clay/sand mortar is that a total rebuild would really just be a long afternoon or two- not a big deal"

yep agree with that 100%. Construction isn't my trade but i have a fair amount of experience & clay/sand mortar has been a revelation to me. Thanks for replying Manny

[mannytheseacow]

I finally got around to putting the build photos into youtube: