• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education experiences global resources the cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • Anne Miller
  • paul wheaton
stewards:
  • Joseph Lofthouse
  • Jocelyn Campbell
  • Mike Jay
garden masters:
  • Steve Thorn
  • Dave Burton
  • Joylynn Hardesty
gardeners:
  • Carla Burke
  • Pearl Sutton
  • Greg Martin

Sauna & rocket stove - j6 or j8 ?

 
Posts: 5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I’ve been lurking for over 5(?) years on this forum ...and the time is finally come to post. I’m building an 8sided sauna in my backyard. I was planning originally on having a rocket mass heater inside (with the feeder box outside  , to keep smoke out), running pipes under the benches on the inside. But... I don’t know what size would be optimal. I want a stove that heats quickly and  absorbs  heat well So the heat from the exhaust pipe is cool...but the actual area of my sauna is so small… Could I get away with a j6 inch system?  I don’t want to build a system that burns too hot if I don’t need to.What are your thoughts ?👍🏼🙏🏼😀
3E228679-1C6A-4376-84F3-43CBD2335D4F.jpeg
[Thumbnail for 3E228679-1C6A-4376-84F3-43CBD2335D4F.jpeg]
Pipe layout
8399EE05-A850-4946-AE85-4A996A80833A.jpeg
[Thumbnail for 8399EE05-A850-4946-AE85-4A996A80833A.jpeg]
20”x20” butt placeholders , pipe, door
 
gardener
Posts: 2212
Location: latitude 47 N.W. montana zone 6A
275
cat pig rocket stoves
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Vince; Welcome to the wonderful world of rocket science!
A 6" J tube will be plenty for your sauna. You may want to cob 50% of your barrel to slow down radiant heat.
If I read your design correctly it appears you are right around the 30' of pipe recommended for a 6" system.
Have you considered "bell" benches in place of piping ?
Take lots of photo's as you build, our happy crew of rocket scientists is eagerly awaiting guiding you on your first build.
thJU1W6X2H.jpg
[Thumbnail for thJU1W6X2H.jpg]
Happy Rocket Scientists
4f18b320d1f95c5265a5c9ae876c38cc.jpg
[Thumbnail for 4f18b320d1f95c5265a5c9ae876c38cc.jpg]
Early prototype
 
Vince Panero
Posts: 5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Thank you Thomas! Actually I was wondering about purchasing (or finding) plans to do a small bell style rocket stove or a 6 inch J tube style rocket stove… I’ve heard of Ernie and Erica’s j-6 plans somewhere on these forums, But I have not heard of another stove plan that is thrifty on wood but also warms up fast. Maybe the cyclone bell rocket is in the running— a stove that was covered in a permies video that I saw a recently.  Is that what you were referring to?  Is there a tried and true trusted plan for a stove like that by chance ?
Lastly, is there a rocket stove version that heats up very quickly?  My sauna is small, will be thoroughly insulated via clay slip or lite straw clay , With 4 to 6 inch wide insulated  roof/walls... should be able to  hold the heat for a couple hours of a sauna session. 150-180° tops target temp in room.

Given the fact the size of the sauna is so small, would a 4inch tunnel design cyclone bell style work? How small could I go ? I feel a 25 gallon barrel would be over kill. Thoughts and opinions welcome 🙏🏼 Thank you all !
 
Posts: 448
Location: Wellington, New Zealand
14
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator


You could ask Matt Walker/Remine how his rocket sauna worked out?
 
Posts: 126
Location: South Australia
7
duck chicken solar
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I have been a part of two wood heater saunas. The second was a small sauna with a 4.5" batch rocket. The thing cranks to 130c with that heater. We find that between 65c and 80c to be a good balance so it is more than enough power.
Yours is a lot larger but I would think even a 5" would do the job.
Adding mass will cause it to take a very long time to heat so I would advise just using a barrel with some rocks on top. That way you can still use water on the heater but get instant heat when you light the fire.
 
rubbery bacon. rubbery tiny ad:
Dave Burton's Boot Adventures at Wheaton Labs and Basecamp
https://permies.com/t/119676/permaculture-projects/Dave-Burton-Boot-Adventures-Wheaton
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!