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Question about RMH stove pipe size

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My current wood stove has a 6 inch pipe running 18 feet up. I have heat sheild on to meet clearances required by code for being near the wall.

I want to build RMH  to be the main heat source for my small 24x24 strawbale house.

With the CSA needing to be consistent I understand that a 6 inch system has to have a smaller feed box. Im a bit worried about this being to small and less practical then the bigger feed with an 8 inch system.  Also, since this will eventually be primary heat forbthe house I need it to be able to warm up the house very well. I want the option of making the house too warm then needed.

Building an 8 inch rocket stove means changing all my pipes and insulated chimney and new heat shield which adds a lot of costs to the project.

From people with experience using RMH, is an 8 inch system worth it even with additional costs or would a 6 inch RMH using existing chimney be enough ?


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Location: Ashhurst New Zealand
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Hi Joel, and welcome to permies. What part of the world are you located in? How cold are your winters? Is that 24x24 feet or meters?

If you're not in a super cold winter climate and that's feet, a six inch CSA RMH will heat a well-insulated straw bale dwelling brilliantly.
Joel Huppe
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Hi Steve, Thank you for the welcome. Im in Quebec Canada so our winters are pretty cold. The house is 24x24 feet with interior dimensions being  21 x 21 feet with two lofts above and cathedral style ceilings. Even tho it has a small square footage the house has quite a bit of space to it. I have in floor radiant heating and off a propane boiler and plug electric radiant heaters but im trying to move away from those.

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