First - a confession=>
I am a tree lover and given my preferences will not use firewood at all for heating.
That being said - here I be, in a house where burning wood for heat is the only available choice - so getting good heat AND using less wood suits me quite nicely if such is possible...and it IS now truly possible !!!
The odd-looking contraption I made works so wonderfully well that it really amazes me.
This house was built around 1880 from what I've been told - it is not nearly tight and not easy to heat because of it's door placements.
Before today I used the RMH on a cold day and it did a good but not great job owing to the heat's lack of penetration.
I than took a day and a half off from heating due to warmer/sunny weather - and had a chance to dig out the solution - a small, quiet 120V fan.
Mounted it towards the back of that room's doorway, and presto - heat moving problem is now 100% solved.
Here is what I would share with anyone perched on the fence as I had been for some time=>
These things need not be made to exacting specs and I think there is no solidly right vs. wrong way to do it; just make yours to suit your space & needs.
What I made here is using so little wood to make so much heat - for so many hours at a time that it pleases me greatly.
Being on the 2nd floor, I use a 5-gallon bucket to haul up wood.
For the box stove - on a cold day, just to keep the house decently warm would easily take from 2-5 full buckets of wood.
For the RMH - which heats this house more evenly & thoroughly - it takes less than a bucketful to get MUCH better heat which then lasts for hours after the fire is out.
The RMH is also incredibly easy to start.
To get split, thick logs started in the box stove takes the better part of an hour using a load of paper & kindling - and then it takes a couple of hours before the heat spreads out enough for the kitchen & bathroom to be comfortable at all (and the mud room would be closed off as well).
The RMH takes under 10 minutes to be burning small oak splits - warms the mud room instantly - and the rest of the house via the small fan in about 40 minutes altogether.
Here's what I really love about using this:
2 hours after the fire is out & the burn tunnel is capped I go feel it's masonry and it is still giving off a significant amount of heat despite not having a huge amount of thermal mass - and to me that is just...wow...what could be better ?!?
I've known folks who used 9, 10 or more cords of wood per winter - and this method of heating makes that seem like such an obviously sad waste.
In a place like this where there's a woods right behind it - I may now have to totally re-think my personal POV about wood heat.
All I will have to do for there to be enough firewood for a whole heating season here would be to make a walk with grain bags every nice day - fill them with tree drops - and stack them up - heating a whole place with just sticks - wow twice.
This is a huge improvement - amazing to use - and very pleasant.
(This is also the exactly perfect solution for using solid fuel heating for an asthmatic like myself.)
My Sincerest Thanks to all the Good Folks here who pitched in to my various threads while I was getting into this.
This truly is a life changing technology which I highly recommend.