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RMH in Small Space?  RSS feed

 
Posts: 13
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Currently I just have a woodstove for my house, I use it for heating and cooking. It works great for cooking, but if the fire has been out for fifteen minutes it already starts to get cold again...so waking up in the morning is never fun...
The dimensions of the house are 10'x12', and I have this corner with wall space of 5' on one side and 4' in the other.
My questions are:
Is this too small of a space for an efficient cob style RMH?
Can you do all your cooking on a rocket mass heater?
I think I'll just move my current woodstove outside for when its hot out so I can just cook out there in the summer.
(If this is already covered somewhere, feel free to delete this post)
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gardener
Posts: 2581
Location: Upstate NY, zone 5
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Looking at your dedicated woodstove space, I would say it is totally doable to replace it with an RMH. The one possible issue would be weight - a viable RMH would have to weigh around a ton at minimum, to hold enough heat to coast overnight. What is the foundation like for your house? How practical would it be to beef up the footings or add new in that corner?

To start the layout discussion, I would suggest putting the RMH feed and barrel about where the woodstove is now, with a bench extending to the wall behind it and wrapping around to the 5' side. This would actually give you a nice seat to relax and keep warm on, where there is little usability of that corner now.

I would think a 6" system would be the right size. This can use a 35 gallon barrel instead of 55 gallon, saving space. It would have a smaller cooktop, 15" diameter vs. 22" for the 55 gallon. You could put in a back shelf for warming/simmering if you wanted.
 
pollinator
Posts: 1114
Location: RRV of da Nort
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I agree with Glenn that you could probably squeeze a small (and more cozy!) RMH in that space.  Glenn and others, one thing I was pondering recently which may have been addressed before is running the heat-exchanging pipe (with heat-holding mass) under the floor of structures where one wishes to preserve usable space.  The crude depiction below shows what I mean.  Clearly, the downward "pull" needed in order to have the exhaust travel below floor-line would be a concern, but with the right height of stack, might this work?  One could then have a strip of brick-work as part of the interior floor that was heated and helping to heat the building as well, even as it appears one would be losing additional heat at the sides and bottom of the heat exchanger. Thoughts?
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Glenn Herbert
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Posts: 2581
Location: Upstate NY, zone 5
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People have done things like this before. It would obviously be easiest in new construction.
rocket mass floor heater -- finally completed and it works!
 
Braden Pickard
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Thanks for the responses and info!
I didn't think about the weight. Yeah, I would definitely want to put something extra under that space, it's definitely not suitable currently for a lot of weight.

Thanks again!
 
Posts: 568
Location: ontario, canada
fungi tiny house transportation
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You should have a metal protection sheet under your wood stove so embers don't damage your wooden floor, or worse, should any embers escape somehow. 

You can add a small amount of bricks around your existing stove to create a small hearth which can act as a tiny thermal mass battery to slightly increase efficiency and safety.
 
Why does your bag say "bombs"? The reason I ask is that my bag says "tiny ads" and it has stuff like this:
What would you cook first in a rocket oven?
https://permies.com/t/89866/cook-rocket-oven
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