secondary burn tube

I haven't found anywhere the thought of using existing 2" walled insulated stainless stove pipe ,Sent--al brand up here in Canada ,6" ID,3' length, 2150 degree rating ,for a hundred bucks,sounds a lot easier than messing around trying to cobble something up.Has anyone tried this ,and if so ,success/failure ? thank you,Bob

bob dunkin wrote: I haven't found anywhere the thought of using existing 2" walled insulated stainless stove pipe ,Sent--al brand up here in Canada ,6" ID,3' length, 2150 degree rating ,for a hundred bucks,sounds a lot easier than messing around trying to cobble something up.Has anyone tried this ,and if so ,success/failure ? thank you,Bob

Bob,
I think the first limitation for some folks is $$$. Putting ALL of the components together can start to add up. They say dirt cheap, they mean it.

Bob Dunkin : Yes you can ! You certainly can use an insulated stainless steel pipe for a heat Riser at $100.CND a pop but be prepared for your Heat Riser to fail at some point
and need replacement ! It will probably be necessary as a final vertical chimney interior or exterior If your chimney will get inspected ! Otherwise with final exhaust temps below
100*C, It might be a place to consider economy, especially as adding enough chimney to go two meters over the roof peak of a 2-story house adds up quickly !

Only because the way you asked the question might confuse future readers, I will mention that you would never want to use any kind of Insulated pipe in your horizontal Thermal
Mass ! For the good of the Craft ! Big AL !

P.S. You may want to review the material on High Temperature Hydrogen attack at Wikipedia to grasp how easily all steels can fail ! A.L.

Thanks guys , I will do some further research for sure, I just had the impression that people were going to steel for their burn tubes ,(not the ducting in the mass) and insulating the steel tube ,,,mayhaps I had some out dated info. my plan is to go horizontal exhaust ,with everything outside (similar to those gawd awful boiler systems but much more efficient,,,heck ,a bonfire would be more efficient),and duct warm air into the house ,as I am working with limited space and moronic inspectors/codes, it's a real issue around here, and I'm not the most subtle negotiator,

Bob Dunkin : Two things, really dumb code enforcement officers are a prize, them you simply tell them its a masonry heater but that you plan on meeting
the higher standards of a wood stove installation !

Yes it is possible to build something like you want to do, but it is a much larger project than building a masonry Heater, in effect you are building that
masonry heater outdoors and then ducting in your warm air supply ducting, and your cold air return line ducts !

Go to your Fossil fueled forced air furnace and count the number of warm air ducts, 6''= 28 sq. inches, 7''=31.5 sq. inches 8''= 50 sq. inches, add them all
up double it to allow for the cold air return pipes, and that will be the size of the Two Holes Hot supply air, and cold return air, you will cut into the side of
your house to allow you to tap into the existing ductwork in your house !

You should go to rocketstoves.com to download a $15.ooU.S. PDF Copy of Ianto Evans' Great Book 'Rocket Mass Heaters', and then experiment
with a much simpler Model to make as a First build ! After you have a working model in your backyard which should not require any permitting see if you can
view the Rocket as a Hand-Sculpted piece of fine Built-in-furnature, something you would be willing to give pride of place to in the very center of your home !

From that location tending your rocket is a simple task done routinely, and with out any more thought than goes into putting the tea pot on and dealing with its
whistle . Any RMH, located at a distant location even still with-in the home becomes an unwelcome distraction, and a drudges task, avoided or shirked giving
you poor heat at best! That becomes like trying to toilet train an intractable child ! though thankfully, not as messy !

Welcomed into your home your rocket becomes like a close member of the family, gathering everyone together!

A Rocket Mass Heater should be like a well endowed Bank Account, receiving regular Deposits of small fine split wood and paying you Regular dividends in the
form of comforting Relaxing Heat !

Come back here often, if there is a Rocket in your home future we will help you find it ! BiG AL !

Yes ,i have been weighing the benefits/disadvantages of different options . i have a shop/garage that I will experiment with ,to get more hands on,and i will be ordering some literature from the site ,probably the dvd set.However,it is currently -25 c outside so it may have to wait a bit,,, Bob