What do you think?
Why use a Dragon Heater Shippable Core in your Rocket Mass Heater?
Using a Dragon Heater Shippable Core for your rocket mass heater makes construction faster, easier, and your heater's performance will be superior to what you can achieve using traditional approaches. A Dragon Burner will outperform a traditional rocket heater, because it is made of superior materials, has an optimized (patent pending) burn tunnel, and utilizes secondary air channels for complete combustion.
Pre-Engineered Rocket Mass Heater
Countless people of have put days of labor into their rocket heater project only to have it fail. This happens because the rules for sizing the various parts in relation to each other have been difficult to understand and unsuitable materials have been substituted for the proper ones. By using a Dragon Heater, you are assured the engineering is right and it will last. You don’t want a heater to fail when you need it most.
I realy like some of the features in the casting
Well, this is the core developed by Peter van Den Berg. You can read the whole story here.
I find the price of the cores very high . But that's just me. The dragonheater people use to come here, just to drag business. And nick other peoples ideas. So you can sense my feeling about them.
In fine, you don't need a cast core to make your own rocket mass heater.
Plus, i would say, i'm an advocate of the higher powered batch rockets.
I completely understand with the cost issue and yes I too like the look of a batch rocket.
What I most liked about the dragon was the insulation around the fire tunnel. That must bring it up to working temperature faster than a clay brick j tube. But there again if a clay brick design breaks I can fix it myself...
Here is where I'm at; I have a pile of old clay bricks (enough for the j tube + a few), a bag of fire clay, a bigger bag of perlite, an oil drum (now without top, burnt out and cleaned up) and a few lengths of 6 inch stainless flue pipe I salvaged. I have good volcanic clay a spade's depth into my garden, so I think all I need now is sand and straw. I'd like to build the rocket mass heater in my workshop which is under my house. As my workshop has concrete floor and walls this should work safely. The trouble I'm having is with the other half. She's worried about the insurance cover with an unpermited stove. So with plans on hold it might end up in a poly tunnel, sigh.
Well, a cast refractory goes up fast in temperature, but not as fast as an insulating firebrick one. That's an example.
Clay and perlite cob might heat up as fast.
Well, regarding the other half issue. Build one outside, a complete one, but that you can dismantle later. And show her how safe it is.
Than again, i advocate the batch, because it is a mass heater. And can be insured as one. If you know the norms, clearances etc. You wouldn't be insured with a dragon heaters core.
Thanks for sharing your set up, I like it so far. It looks hot enough!
I'm leaning towards a 8inch/200mm batch type mass heater too. I'll make one outside. If all goes well I'll then build a poly tunnel over it.
Here's hoping NZ coding comes round to excepting these things.
I'm now leaning towards a 8inch batch mass heater in the garden.
Lots of reading first. I will post results on a new thread when I've got something to show. That may be a wee while as I'm waiting for back surgery.