the details of my absence from my ongoing posts are inconsequential ; very well where do I begin....
First, thank you for your patience. My job on the road has prevented me from tinkering with the Mark II during the summer so a retrofit/ autopsy was not attempted as it is still in commission keeping us comfortable in our home. Believe me ! I want to see what is going on in this heater to confirm what is going on with the ceramic riser coating and all but wifey wants a warm house during our cold damp fall and so be it!
Of course that can only mean one thing... Yes I am happy to announce that a Mark III is under construction and over the next few days, fingers crossed, should be completed and replacing the old Mark II which will then be examined under the relentless appetite my grinders cutting wheel.
Secondly, I would like to thank all of you here at Permies for viewing this post over 2200 times! I’m certain that 50 or so can be attributed to me with edits and clarifications, but it does confirm that there is an interest in a pellet fed rocket heater that is a little different than what seems to be norm in rocket heaters on this site.
Finally, I tend not to take as many photos as most people like but please bear with me on this. Construction of a RMH is a personal fabrication and tends to change on a budget, design consideration, material availability and a plethora of other things. So please, don’t nail me to the proverbial cross when you read below and you see something that is incongruous with above design wants and considerations. I am posting all my successes and failures so someone else can look at this and hopefully build a better version of what I have and keep themselves and others warm in their home.
So without further adieu, I introduce the Mark III almost complete .... but first, this tiny ad. Just kidding! Lol always wanted to put that in a post.
A brief explanation of what actually changed from the Mark II and what remains the same
What remains the same....
2 x 100 lb. propane tanks for the low footprint but increased height for more surface area and increased riser height.
The horizontal flame tube (3” heavy wall square iron) remains so the smaller burner tube can easily be removed/ replaced as it does erode under the extreme heat and yes, I’m still working with the original burner assembly from the “Frankenstove “ era (I’m using it for testing and will post the new burner assembly in another post later) I have learned that it is wise to change only a couple of variables at a time.
What has changed in the Mark III construction ...
The Ceramic Tube Risers have finally been used!
The use of high heat refractory material such as perlite, silica sand and home made water glass as the adhesive material. Caution ⚠️ making water glass involves nasty chemicals and extreme caution so be careful; that’s all I’m saying on that.
The shape of the secondary air / ash drop has been changed to a conical shape that allows ash to drop into the base of the stove and yet allow combustion air to travel up the riser at the same time. Two birds ...
Increased riser diameter from 3” to 4” and increased riser height from 33” to 45”
The increases in riser height and diameter is expected to improve ease of lighting and draft within the heater.
Here is the build so far