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Special Heat Riser Core

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So in the KickStarter I have heard about the special heat riser core that is performing better than the old styles.
In the limited video and pictures I have seen what seems to be a taller medium sized barrel (2 welded together and inverted)
Questions: In the portable / 1hour build unit
What is so special about the special heat riser core?
How do you make it, I am building units now and cannot wait months for the DVDs. Paul! I will pay for the unedited footage now!
What is the diameter of the heat riser, it seems it couldn't be 6" because the barrels are so thin and there wouldn't be enough insulation. so less insulation or using a 4" or 5" pipe?

Question: Boom Squish
What is it, and what is the most efficient and easiest way to heat water with a rocket mass heater?
In the video I saw non-copper tubing (looked like 1" diamter flexible - what is this called?) wrapped around the horizontal exhaust and insulated(with what?)
are they using a recirc pump or thermosyphon.

If anyone has any help here(links to videos or other answers, clues on the forum, SO MUCH APPRECIATED THANKYOU@!!!

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I have the same question for the "better core". I'm wanting to start getting supplies together to put a rocket stove in my barn that has my greenhouse attached. Just like Organdy, I'm wanting to use the "boom swish" method to use a 12v recirculating pump to heat the concrete slab in the barn. Help us out Paul... Thank you in advance...
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We are getting ready to release our new rocket heater cores. They are based on Peter Van den Bergs J tube design and provide a very sophisticated burn tunnel. The site is not fully functional, but there are a few pictures. The link is here.

Sandy Mathieu
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We did a test of the 6" core today with only one barrel. I clocked the outside top of the barrel temp about every 5 min. Here were the results. All temps in F

Mins/Barrel Temp
50/+1000 - probably 1020 (based on -20 degree reading)

The bottom of the barrel ranged from 350-412

fuel was dried oak

Previous test with two barrels where the top of the barrel was over 3ft from the top of the heat riser. The max top of the barrel was around 650F.
There's a city wide manhunt for this tiny ad:
Rocket Mass Heater Manual - now free for a while
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