charcoal is the best fuel for indoor heating imo. burns perfectly clean, pressed into balls it has a very even burn, energy density is max.
anthracite coal can be slightly better but i think the price margin is not so great, if you can even find it.
also, i just learned about retort charcoal kilns, they use far less wood because it just basically reaches the right temperature to carbonize everything and the gas that vents off goes back kin to mix with the air and flames and around it goes.
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— Propane tank design
- — Three-cylinder design
- — Commercial plans available
- — Smoker conversion
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— Open-top alternative


Instructables
Charcoal Retort
Charcoal Retort: I have had a couple of attempts making charcoal using 44 gallon drums and they have worked okay, but needing a new project after b...
Charcoal Retort V.2.0 – Crossed Heart Forge
Hookway Retort | Charcoal Making – Has James Hookway made the best charcoal retort in the world? Information on how to build a charcoal retort and make charcoal. Buy 100% pure local charcoal, retort plans and more.
Retort Build From Smoker (biochar forum at permies)
I have been wanting to build a retort charcoal kiln, to process some of the wood I have that is too large for my chipper into charcoal. Anyway I am...

Beyond Buckthorns
Beyond Buckthorns - From plans to build - a Kontiki kiln for charcoal making
In order to close the loop of my biogas systems outputs I thought of a mixture of shit, piss, effluent and charcoal some years ago. The only missin...


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ᴋɪɴᴅᴀ ᴡɪꜱʜ ɪ'ᴅ ʟᴏᴏᴋᴇᴅ ɪɴᴛᴏ ᴛʜɪꜱ ꜱᴏᴏɴᴇʀ ʙᴇᴄᴀᴜꜱᴇ ᴛʜᴇ ꜱᴇʀᴠᴇʀ ɪꜱ ꜰᴀꜱᴛ, ᴀɴᴅ ɴᴏᴡ ᴛʜᴀᴛ ᴍʏ ʀᴇʟᴀʏ ᴄᴀɴ ʜᴏꜱᴛ ᴍᴇᴅɪᴀ, ʜᴀᴠɪɴɢ ᴛʜᴀᴛ ʜᴇᴀᴅʀᴏᴏᴍ ᴡᴏᴜʟᴅ ʙᴇ ɴɪᴄᴇ, ᴏɴ ᴛᴏᴘ ᴏꜰ ʙᴇɪɴɢ ᴀʙʟᴇ ᴛᴏ ᴜꜱᴇ ɪᴛ ꜰᴏʀ ᴡᴏʀᴋɪɴɢ ᴏɴ ᴄᴏᴅᴇ ᴛʜᴀᴛ ᴡɪʟʟ ɴᴇᴇᴅ ᴀᴛ ʟᴇᴀꜱᴛ, ɪᴅᴋ, ᴍᴀʏʙᴇ 160ɢʙ ᴏꜰ ꜱᴘᴀᴄᴇ ꜰᴏʀ ᴛʜᴇ ᴄʜᴀɪɴ.