Len Ovens wrote:
Brad Hengen wrote:I have seen barrels used over a barrel stove to steal more heat before it leaves through the flue.
not really the same thing as the ones I have seen exit higher than entrance and of course there is no mass.
I wonder, if a barrel could be adapted onto the flue exit from a standard wood stove, to act as a bell/strat chamber?
Something like Peterburg's three barrel bell, but using a standard UL approved stove vs an unapproved batch rocket heater.
There are two difficulties here. The first is that the flue and how it is run is a part of the "UL approved" part. Certainly the permit inspector
will expect it so. Secondly, without mass, the tin stove will get run at an idle because it will be "too hot". The bell will only make this worse
if it has no mass around it... that is if it is only made out of a barrel.
a bypass could be built in for easy lighting, then close it for the heat cycle.
if a large amount of mass was added to this, a small stove burned HOT could be used to cheat the local bylaws and such.
If you used the permit process either you would install as per stove manual and modify after inspection rendering it no longer inspected or
you install lots of mass and end up with a masonry heater which has different rules and probably gets rejected and you remove it.
Better to get a professionally installed masonry heater with bells and or benches that will pass inspection. A proper steel wood stove
will cost as much as $5000 installed properly and a properly installed masonry heater can be as low as $10000 depending on the available foundation.
Oh ya, foundation. Mass requires a foundation to carry the load. This is not that expensive if it is designed into the original foundation or even fitted
later if access is easy. It could be expensive if your floor falls through. Part of the reason for getting a permit is to get a mortgage... mortgage requires
insurance. If you ever use that insurance with a modified wood burning appliance the insurance is void.
So in my opinion, you either do the whole thing non-permitted or you make sure your inspector is happy with what you are doing. If you are able to do
something in a non-permitted context, a rocket stove or masonry heater from the ground up just makes more sense. A masonry heater can be made with
the same number of fire bricks as the rocket mass heater with the rest being clay or home made adobe. So the price if permits are out of the picture is similar
for both. I would suggest the skill level is not that different either.
I have no opinion on which is better between RMH and masonry heater, but Frankenstein heater... not unless you have more skill than average and just like to tinker.
thomas rubino wrote:Not needed to slope at all . Hot air rises.