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Rocket mass heater with an oven?  RSS feed

 
                          
Posts: 140
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Hi all.  This is my first post here.  Some of you may know me from the Homesteading Today forum.  I'm thinking of building a rocket mass heater.  I'm wondering if anyone has made one with a built in oven.  While I'm at it, could a smoker be incorporated?  I have an old cement stave silo that I am going to tear down.  How could I use the staves in the construction?  I don't plan on installing a water heater at this time, but could I run some tubing through the system that I could hook up to at a later date?

I know, a lot of questions.  Thanks in advance for your suggestions.
 
steward
Posts: 3410
Location: woodland, washington
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I think you could do the oven for sure.  would be a fun challenge to work out how to best regulate the temperature.

a smoker, though, probably wouldn't work with this sort of stove.  as I understand it, low temperatures with a lot of smoke are best for that, and a rocket stove is designed for high temperatures and roughly no smoke.

installing plumbing to be connected at a later date: could work.  if you get it right, you'll be golden when the time comes to hook it up.  but I bet there are an awful lot of ways to get that wrong, and several of them could cause you some serious trouble.  just be real careful.  or wait until the next edition of the rocket mass heater book is published.
 
                          
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Maybe a sliding door on the oven to regulate temp?  Close the door to add heat, partially open it to lower the temp.
 
tel jetson
steward
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Tinknal wrote:
Maybe a sliding door on the oven to regulate temp?  Close the door to add heat, partially open it to lower the temp.



that's the first thing that sprang to mind for me, too.  lots of things need a fair amount of moisture in the oven to cook well, though, and I think all the moisture would escape with an open door.  on the other hand, it might work perfectly.
 
                          
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I probably wouldn't use it for things that needed precision temp control.  I was thinking more like putting a roast and taters in a dutch oven, hot dish, that sort of thing.  If I left the door wide open it might even work for a dehydrator.
 
                        
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I haven't used one (yet) so this is just a best guess, but it seems to me it would be best approached like using a clay pizza oven...get it hot and then use the residual heat to bake things which dont need the extremely high heat.  Opening/closing the oven door will give you wide temp swings I should imagine...make baking stuff an adventure if nothing else

I HAVE used a shepherder's stove and the way to regulate that is with the fire, it can go from zero to 500 degrees and back very fast, but there isn't any mass to hold the heat. That strategy would possibly work as well with this but from what I understand, a little fire goes a long way so it might be a case of getting it up to temp, and then having little sporadic fires to keep the heat up? sounds like experiment time...
 
gardener
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Location: Tonasket washington
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an oven works fine on top of the barrel (A bit on the small side if you dont build a support for the oven walls so the bottom is the bake floor.)  doing a temporary oven you can use aluminum foil or a large terra-cotta flower pot that fits on the barrel. put a layer of cob or tile in the barrel recess so you have a good bake floor. cover the pot with foil and put a stopper in the drain so you have some heat control. the pot will hold a good amount of heat and you can store it in a closet so its not always on the stove. to get more elaborate you could figure out a way to insulate the pot. This however will add weight and make it harder to store.
 
                                        
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I was thinking of two different things along this line. 1. A metal oven insert with a conventional oven door. Doesn't have to be this way but with the insert, it could be placed into the system as some point where it warms up along with everything else but not directly tied into the exhaust.
2. is incorporating a face at the burn pit with a glass fireplace or wood stove door. Still loading the wood from the top but having the glass for a nice look at the fire and it would double as an ash clean out. Never have to worry about cleaning the nasty smoke off the glass because it is all drawn the other direction.
 
Posts: 30
Location: La Bretagne
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I was wondering if the original poster ever did this project and, if so, would you care to share your design and experience? Thank you.
 
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Hi all. Sorry to arrive so late for this topic.

I have built a pretty large oven with a rocket stove as it's heat source. It burns very well but really can't heat the clay oven I built above it sufficiently. I've now added a chimney so that I can burn a fire directly inside the oven body with less smoke than occurs without a chimney. The upshot is that in my experience rocket stoves burn clean but not hot enough to heat a large clay oven, fires inside even large clay ovens heat well but are smokey even with a chimney. Maybe it's all a trade off or maybe I'm just too inexperienced, but it was definitely a worthwhile project.
Good luck all!
 
Posts: 106
Location: Sandpoint, Idaho
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See my build thread for a unit with a large oven that is 14 high x 16 wide and 20 deep.
 
steward
Posts: 1793
Location: Western Kentucky-Climate Unpredictable Zone 6b
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Alan , could you provide a link ?
 
Alan Mikoleit
Posts: 106
Location: Sandpoint, Idaho
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