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Still don’t get it very badly illustrated 🥵🥵

So, i think the jist is, doors open = higher peak temp, but more heat washed away up the chimney Controlled burn = slightly lower peak temp but more heat for longer Does the increased temp of the open doors 'efficient burn''mean less nasties overall in the flue gases?

Fascinating, thankyou for the insight into these beautiful stoves, here in Wales im wondering what the next stove i build will look like.

The section views at 13:15 and following of the old style heater resemble the shape of the cross sections in G. E. Asp's "Salia ja kahta viereista kamaria lammittava patterilitteinen uuni" of circa 1938, found in Figure 72 of his book "Uuninmuuraaja". Similar to the heater seen at 14:04 and following, it has a pre-heated secondary air supply, but omits the sand battery. I spotted Asp's heater in David Lyle's book, and would like (eventually) to build it, though to heat just two rooms (back to back) rather than three, as Asp shows and describes. See here: drive.google.com/file/d/1e2OGWP0SXFBenM2W0bBYRyl7k64Gwy_-/view?usp=sharing

Great subject. Few issues, however. Please lose the music. It is not necessary and it is cripplingly annoying. Also you have sound problems. Most of the time I could not hear what you were saying, even at max sound settings

Bugs Bunny approved. 😂

Interesting problem solving.

I had no idea those could store so long! Good stuff. Thanks for sharing.

Adding a sand battery is genius.

I remmember that when i grew up and we go visit grandpa then he had a house buid in 1865 from natural stones and wall thickness about 80cm - he had also this type (round and tall) he had to burn it every second dat when outside was -25C id was about 1m in diMETER nd from that gases was also going true a brick heat battery/wall wat was heated from both sides - from kithsen stove and from the "rocket" one... - they are good and efficient I heard that that was masons secret how to make them and at it was been used local stones for heat acumulation - can not confirm if the stones was used - I'm 43 now and they still going fine......

The name sounds and spells Finnish, they are popular in Sweden, I lived in a house in Sweden with five rooms and one of those in every room. Although mine where white in colour.

You know in Spain they have a great old heating system.

Well done.

I presume you were born in England. I agree we should be taking inspiration from the old way's before piped gas. I'm old enough to of seen the the before and after of the modernisation of the 2 up 2 down 100+ year old homes here in the NW England and having 4 open fires obviously wasn't a good idea but blanking them off and using gas central heating and mod cons like upstairs bathrooms etc can result in condensation and mold if the original design of air flow is dismissed. I've recently started work in a small ish work shop and energy bills are a strain on the business for my boss I've noticed outside at a corner of the building there's a red brick chimney that is in very good condition I'm not sure if it was for a steam engine or heating

I love this subject! When I was on vacation in Sirkka in northern Finland we had two big fireplaces. The one upstairs didn't work that well, it had glass doors that apparently needed to stay open when burning. But I found out about the chimney being connected to the underside and was really surprised by that. At first I just thought it wasn't a working fireplace. But very interesting to see they are specially build to slowly release heat. Which is to be expected in a climate where -30 isn't uncommon.

FYI in Russia this kind of stoves is called "голландка" (a holland stove), the round metal cased subtype frequently called "стояк" (a riser)

14:36 so part of the secret is the sand battery..? Can you heat water and put it in the ground?

Hell, that is boring.

Fantastic video. I think this is the only video on TH-cam that explains the system of heating an entire house rather than just a single room. You should expand on this concept and explain more in depth the whole house chimney system (Talon Sydän as you called it).

Kiitos videosta!

Just discovered your channel. Great content! Would love to see more info on the modern versions as well.

Brilliant…🔥🥳

Fascinating to see this. I used to build these in Norfolk (UK) with a friend, back in the 1980’s.

My best guess as to why the bricks heat faster is that the fire might still be burning hotter. Reducing air flow will lead to an inefficient burn IF there isn't enough oxygen to complete combustion, but if you have EXCESS air, reducing air flow can get you closer to the stoichiometric optimum and reduces the amount of air mass you have to heat.

Man, the more you want to geek out on these masonry heaters, the happier you’d make me! (I’ve been experimenting with the ash-corrosion resistance of aluminosilicate/zirconia-mullite refractory materials myself for masonry heater fireboxs - and I would love to see your idea of building a new/optimized version of one of these!) Very happy to be newly subscribed to your channel. Cheers!

Brilliantly done!

Thank you so very, very much for taking the time to actually film this whole process and edit it into a hands-on example of how these stove/ovens behave on a practical, daily level. It’s quite difficult to find good info on these heaters, and you’ve done a wonderful job. Can I ask where one might find the types of Finnish stove drawings you briefly showed examples of at the end? I’ve found some Russian and Ukrainian brick stove flue channel drawings, and the German/Austrian Kachelofen/Grundofen types… but have struggled to turn up any Finnish ones. Can’t seem to locate any of Heikki Hyytiainen‘s published research papers either... Any book titles or websites you’re aware of would be *immensely* appreciated. Again, thank you-thank you for these video uploads!

Thank you for this. I'm going to try it by leaving the freezer in an unhealed insulated shed and see if that can keep them just above freezing. Can't hurt to try.

Can we assume all temperatures referenced are in centigrade?

Very interesting comparison . The reason why on the left with full burn all the time surface temperature was lower may be because the speed of flue gases was too high. I am going also to build masonry heater. Do you have experience with rocket masonry heater - batchrocket with heat riser, vortex? Could be big difference between "classic" fireplace with afterburn chamber and any rocket stove? In terms of clean burning , flue temperature and total amount of heat from the same amount of wood.

As Winter is coming again, Will you Be making More masonry Heater videos. I think interesting video topic would Be to explain secondary Burn and how it is utilized in different heaters. I do know its something to do with re introducing oxygen to The Burn gasses or something but More indepth explanation would Be nice

So interesting. Thank you.

hey whats your main channel if i may ask?

Correct, the current batch of Canadian politicians are ridiculous. The heat pump fallacy is but one.

I wonder how this would work on potatoes?

I’m not familiar with your oven heater but have you tried partially shutting those baffles while it’s burning hot to see if it slows down your draft instead of choking down the air? This may help the heat soak into the bricks faster without a dirty burn? Anyway to monitor flue temps? This would be a good way to monitor what’s going on as well.

Nice video! Do you ever take temps from the outside of the bricks with an IR thermometer?

Thanks for geeking out - please continue...and kindly do a review of that interesting looking masonry heater wall

Great video, love the side by side test, and would love to see a comparison between new and an old sand trapped stove!

Thank you for making these fantastic and thorough videos! I’d love to see more examples of old Finnish and Swedish masonry heater/stoves. I’m building an off grid cabin in Swedish Lapland and was planning on building a classic Swedish kakelugn or rörspis. Do you have and recommendations on books or schematics for building your own stove?

good job

Smoke Fromm the chimney Is not good indicator. When is wood glasses combustion ok smoke must completly gone....

Your infrared themometer is seeing a reflective metal surface, which includes cooler images lowering your overall reading. The wall is much less reflective surfac e giving a more accurate reading

Thank you very much, and yes, I did find your clip very very interesting. Five stars and two thumbs up!

Thanks for the update! These experiments are fantastic, they're giving me ideas for how I'd like to build a "root cellar" into the foundation of our home. As always, I greatly appreciate you putting out these videos!

I'm curious whether the exhaust is as clean on the 2nd burn as the first, what the temperatures are on the exhaust and whether they're using the same amount of wood (I apologize if you said this last and I just didn't catch it). Part of the point of the rocket mass heater is to have a very clean burn. It would also be interesting seeing a head to head of a this against the same amount of wood in a well designed rocket mass heater (could be someone else's) as a comparison. How heavy is this? The small footprint is appealing for certain situations. I suspect like other masonry heaters it would require some remodeling for support to add to an existing home.

very helpful. Thank you.

Thanks again for taking the time to make this video! I will be incorporating this idea into my round house design for our Alaskan winters.

You need to bury the refrigerator the dirt

Very interesting but how well does it heat the space and how large of space does it heat? Just seems like those temps aren’t very hot?