Download: Rocket Mass Heater Build

By Bill Rust


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This is the first of 2 videos about a Rocket Mass Heater I am building. This is the longer one that describes the steps I took in its construction. A later video will come that shows it in operation. I got ideas from the following videos:

I don't have a construction skill set so I am learning as I go. Made my first concrete on this build. I have done some woodworking and have read up on building molds for concrete counter tops in the past. Certain things would have been easier with a 55 gal oil drum, but this is a learning project and I had a 15 gallon one available for free. I originally thought to do a 4" system, but after much research opted for a 6" since it solved a lot of potential problems for me.

Creating a mold and burn-away channel.

Concrete/vermiculite mix and removing a cylindrical channel insert

Here's a diagram that I used to help with the math and construction details:

A very good thread on castable heater cores:

I just found this, but it has some info about cob that I may try on my own mass heater:

More videos: