Seems like J tubes may not be the most in-things anymore, but I had a go at one for my cabin anyway.
Riser is just over 10 cm diameter. Should be 10 cm because of the 15 cm diameter pipe plus 2,5 cm ceramic fiber blanket, but the blanket seems to have squashed a bit when I pushed it flat inside the pipe.
Burn chamber CSA is slightly bigger than the riser CSA. This was an accident because I made a few mistakes with sizing when constructing the mold for the core. But the unit works brilliantly and I'm glad I accidentally oversized the mouth.
Gap between riser and top of drum is 3 cm.
The core is 45:40:15 clay:perlite:furnace-cement. Furnace cement was at least two years old. I had some glass rope lying around. I unraveled it into smaller strands and added these for structural integrity - seems to have worked really well.
10 cm flue pipe chimney throughout, with 3 elbows in the system: 1 out the drum, 1 near the ceiling (second pic), and thereafter a 2m horizontal pipe ends with the final elbow to a 1.7m vertical section.
Last Edit: Mar 30, 2021 1:30:27 GMT -8 by whazzatt
Nice build ! What did you use exactly for the metal bell ? Looks like 2 steel trash bins clamped together ? Where did you procure them and found a clamp of the exact right size ? Thanks
I found the steel bins/drums at a scrap yard. I bought about ten of them because I liked their size, and they each come with a clamp that seals a lid to the bin. I used one of the clamps to secure the two bins together.
The bins were initially used for some kind of industrial chemical, I think. When I found them at the scrappy's, they were open and pretty clean from weathering. I burnt the bins on a fire-pit fire, and scrubbed them clean thereafter.
You should be able to find a supplier of variously sized drums in most cities. Ask for one with a lid and a clamp.
TexasGonzo: Sooooo glad I found this site! Its always rewarding to find such a super group of folks! To any and all, feel free to PM me anytime. Thanks for having me!
Mar 11, 2019 18:56:41 GMT -8
jlmtech: GADGET: CONSIDER USING A JET PUMP INSTEAD OF A BLOWER FAN TO INDUCE DRAFT; NO CLOGGING.
Mar 26, 2019 8:19:28 GMT -8
michaelegan: i am unable to open the sketchup files on my mac. I used sketchup a few years back but apparently the company now requires a subscription. does anyone have any advice/instructions on how to use the program or how to view pictures without spending money?
Aug 20, 2019 18:41:48 GMT -8
mannytheseacow: michaelegan: download AutoCAD student version for free... import .SKP
Aug 23, 2019 13:33:44 GMT -8
topbaza: hi everyone, been searching all over net and this is were i need to be i think!!
Sept 28, 2019 6:16:25 GMT -8
anounaki: Hi, why I cant upload photos when I make new tread to this forum?
Feb 28, 2020 2:09:40 GMT -8
ahansen: photos under 1 mb not possible?
Jun 4, 2020 0:09:21 GMT -8
belgiangulch: Photo's are possible. They must be downloaded elsewhere and the image url (adress) is copyied.
Sept 14, 2020 7:26:15 GMT -8
belgiangulch: While creating a thread click on the small picture in the banner above the reply. A box pops up, paste the image url in the box. Pay no attention to the huge list of numbers and such.When you finish and hit reply your post with pictures will come up.
Sept 14, 2020 7:29:27 GMT -8
deadstarsstillburn: Hi there. I was directed this way by folks on the Permies.com website and am hoping I can get some information on how a total newbie can get started designing, siting, building, and not-dying-in-a-horrible-house-fire with a new RMH in a 160-year old home
Oct 21, 2020 6:52:10 GMT -8
deadstarsstillburn: The people over there recommended either a 6" batchbox or an 8" J-tube. I don't know what those are but am going to try to figure that out. What I need is a blueprint that I can scale to fit the need for my house. I have something likne 5000 square feet
Oct 21, 2020 6:53:00 GMT -8
deadstarsstillburn: but I do not need to heat all of it by any means. probably only need to heat half of that, maybe less.
Oct 21, 2020 6:53:15 GMT -8
deadstarsstillburn: moreover, the house has 3 storeys (large attic) so I assume if I get very efficient heating on the ground floor, that will go a long way toward heating the upstairs as well, no?
Oct 21, 2020 6:53:59 GMT -8
BenAlexanderT: Happy new year everybody. I wish you the best
Dec 31, 2020 15:06:14 GMT -8
Solomon: Anybody in Southern Oregon, in Jackson or Josephine counties?
Jan 16, 2021 21:54:43 GMT -8
gnomedome: i realsie this is from 2009
Apr 14, 2021 8:30:44 GMT -8
gnomedome: i realize this is from 2009 id love to see the photos from this ..as im looking to build a sauna soon similar to this .... if anyody sees this post email@example.com..... the photos in this post did not show up
Apr 14, 2021 8:32:00 GMT -8