Rocket Stove Mass Heater

Introduction: Rocket Stove Mass Heater

Le combustible est exposé à une chaleur très intense.  La chaleur augmente dans la cheminée interne isolée ce qui complète la combustion.  Lorsque le rocket atteint sa chaleur normal de fonctionnement, il n'y a pas de fumée qui s'échappe de la cheminée.  J'ai profité de l'expertise d'autres constructeurs de rocket stove sur internet pour proposer ce modèle que j'ai personnalisé à quelques points.

Step 1: Récupérer Un Chauffe Eau Et Le Séparer En Deux Parties

Step 2: En Forme De J, C'est Le Principe Du Rocket Stove

Step 3: Au Tour De L'isolation

Step 4: Installation Et Peinture



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    29 Discussions

    Hello Seniortrader. Very nice looking build there. Would you mind telling me what size tank you used for the build and some other basic dimensions? Any modifications you wish you would have made? I am planning on building one very similar to this soon.

    2 replies


    The tank is made from a 40 gal water heater tank. The intern chimney is a round 3/16 by 4.5 by 38 inches steel tube. It si welded to a 4X4 inches square tube.  I used a piece of 4 inches diameter diesel truck muffler to connect the tank to the exhaust pipe. The feeding part in front is kept in place by the bracket i made... It is very usefull if you want to use more than one kind of feeder but if not i would recommand to weld the feeder directly on the heat chamber.  If i had to do it all over i would use thicker peice of metal to get as much mass as possible.  And another thing... As i'm not a pro welder, i would graind all the welds before taking pictures of it..:) 

    Hoping to see some pics of your project very soon!!!


    Hi, I hope you are still fabricating? What is the distace between the top of the chimney and the underneath of the top? and is it critical? Could you split the fire box with a plate which would keep the fire on the top and fresh air sucked in below? Terrific project, well done ST

    I like what I see! My dad used to make these out of old kerosene barrels. How long did it take you to make? Have you ever heard of a company called Dragon Heaters? They have cores for sale seems much easier to put together than brick.

    2 replies

    Hi billyj789,

    It takes me one day to cut the parts and about 3 hrs to weld everything.

    I did not know about dragon heaters til now and i like there desings. The rocket stove is well known around the world for it's low operation cost and the effectiveness of it's burner.

    I saved a lot of money by switching to this.


    Absolutely Great!

    I have a fireplace but of course it's not very efficient. I've though about getting a wood stove insert but this looks better to me. Since it seems the exhaust pipe is low it shouldn't be a problem to run it up the chimney.

    I might give this a try if I can get someone to weld for me.

    I see how this is a rocket stove, but I don't see how this is a mass heater. It looks like you run the exhaust outside directly after the combustion barrel. Aren't you losing a lot of heat by not routing the exhaust through a mass?

    How is the paint lasting? What kind of paint is it. Is it a specific heat resistant metal paint?

    The Rocket Mass heater tends to burn really hot I believe.

    This project is a really nicely built one. I like your attention to detail a lot. Thank you for taking the time to do this, especially the drawings etc..

    I hope you home and workshop area is toasty warm now.

    Your english is fine too. We get it... LOL... It's better than my French I can promise you that...

    1 reply

    Hy David, Thank you!

    This is a high heat bbq and stove paint, It still look fine ..( i forgot to light the stove outside the first time, can you imagine the smoke in my garage) The heat is great, I mostly use the gravity pellet burner and keep it at the minimum burning rate ...




    My question is, what is the exhaust pipe temp at peak stove temp?

    Thinking about adding a water jacket to absorb heat from the exhaust pipe.

    What are your thoughts?

    1 reply

    Thank you winefarmer1,

    The exhaust pipe does not get hotter than a cup of coffee... The reason why is that the combustion is almost complete at the end of the inside pipe so there is nothing left to burn inside the exhaust pipe. So i don't know about the water jacket!!!


    The size of the square pipe is it 4" ? also the clamp what is it for? i really like this project.............

    Thanks Rick

    1 reply

    Hi Spiderstones,

    Yes this is a 4 inches square pipe and the clamp is holding the burner in place. I can burn small peices of wood with the burner you see on this page or wood pellets with the gravity feed pellet burner...


    Your English is fine.
    I've been waiting for someone to build a rocket mass heater like this. It will be so much more efficient than a wood stove. And a lot cheaper to build than a kachelofen. Everything looks great, but I wonder about one thing -- do you think you have enough mass to take advantage of the heat it will produce? Did you consider applying a thick layer of cob on the surface to better radiate the heat? I don't understand the need for vermiculite and rock wool if your goal is radiant heat.

    Also, what exactly is this made of? Where did the heat chamber come from and where do you get one? Is it the inside of an old hot water heater? Some further details would be very helpful.

    Thanks for your great work!

    3 replies

    From what I have read on other rocket stove web sites it seems that the insulation around the combustion chamber is to hold the heat so that it can burn more completely. The higher the heat, the more complete the combustion and less smoke. Smoke = incomplete combustion. Once the combustion is complete the hotter gasses then heat up the drum which heat up the house. Regular wood burning stoves are designed to radiate heat into the room which does not allow the fire to burn hot enough to burn completely thus A, you get a lot of smoke and B, you need to burn a lot more wood to make up for the inefficient burning.
    Google "Rocket stove" and you will find a lot of information on it.

    I hope you get a chance to build one

    Love the simplicity of your build. It gives me some ideas ... which can be dangerous sometimes:)


    I could not explain this better myself!

    Thank's for your comments!

    " the wood you would use to start the fire in a regular wood burning stove, i heat my garage all evening with it"!!


    You're welcome. One of the ideas this gives me is a way to simplify the burner assembly by using a wood gas burner arrangement as a sort of after burner thus eliminating the more elaborate insulated burner but still getting complete burning. It is still in the "tin can and bailing wire" stage.And I have no clue as to whether it will work or not, but it will be fun to see how it turns out. Thanks for the ideas.