For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
thomas rubino wrote:
What style of RMH were you thinking of?
Tell us more about your house and where you want your RMH to be.
Do you have an existing chimney?
So many questions and so many choices.
Give us some info and we will help guide you to a successful RMH build.
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
thomas rubino wrote:Hi Robert;
In my opinion, if you are building a J tube then 8" is the way to go.
It burns longer and takes larger wood than a 6" J tube.
If you are building a batch box then a 6" is plenty.
7" and 8" BBs are very high outputs and more suited for large areas.
Not all batch box doors have a window in them. Quite a few have no window at all.
Even when they do it is a smaller window, my doors have a 3" round window.
The "Pisla" cast iron door has the largest window.
Can you source sacks of fire clay? (Masonry supply house)
What about 100# sacks of commercial medium building sand? (home Depot)
You're going to want both.
When you build an RMH you need fireclay/sand mortar in the "core" area as concrete will not hold up.
When building your bell you can "If you must" use concrete. Much better to build with a clay sand mortar.
Now let's move on to your "horizontal transition area"
I'll start by saying that if you build a bell design, there is no transition area.
With a bell, you may or may not even use a barrel. Your riser will vent directly into the bell.
Traditionally with a J tube, the riser barrel sat on top of a half barrel.
The start of your horizontal pipe was attached near the bottom of that barrel.
Much tin snipping and shaping was required. (Pain in the Butt)
When I'm building a J tube design with a piped mass.
I enclose the sides of my firebrick core with red clay brick, my riser barrel sits on those walls, and the back 1/3 hangs open.
I create a mini bell from bricks below the back 1/3 of the riser barrel.
A horizontal pipe is connected to the mini bell and then runs thru the mass.
I have found this to be much easier than the barrel method.
You can use a bell with either design, they are not just for batch boxes.
Converting an 8" J tube to a 6" batch later is easily accomplished.
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