I was curious for those of you with a rocket mass heater, how much wood do you burn per year in cords? I’ve read before people saying they burn 1-2 cords per year, but I’m curious on those numbers. For instance how big is your home? Also is that cord number an I split wood cord, you is that your wood split to size for the rocket mass heater and then stacked and called a cord, because those two numbers will be a vast difference in wood split vs unsplit.
I use about one cord a year to heat my approximately 900 sf house (main floor and lofts) in upstate New York, USDA zone 5. I split the wood (mostly oak, ash, black cherry and maple) myself but not to kindling size, much of it around 4" x 4" equivalent.
Glenn Herbert wrote:I use about one cord a year to heat my approximately 900 sf house (main floor and lofts) in upstate New York, USDA zone 5. I split the wood (mostly oak, ash, black cherry and maple) myself but not to kindling size, much of it around 4" x 4" equivalent.
Hi Glenn, so that’s one cord of (roughly) 4”x4” split? Not one unsplit cord subsequently split into 4”x4” correct?
That number has many variables.
Home size and design, how well insulated it is. Personal preferences on how warm you keep your house.
I can tell you that in my uninsulated greenhouse/studio. We were using 12+ full cords to keep it above freezing.
After building an 8" J tube with piped mass, we used less than five cords.
That is burning all day from 7 am or so until 9-10 at night.
They work as stated but each family is different, some prefer it cool some prefer it hot.
Correct. I have sometimes started with a cord's worth (measured by the size of my woodshed) of commercial-sized firewood, sometimes with all properly-sized wood for my RMH, usually a combination. I haven't seen a noticeable difference.
65F through the day and 60F by morning is comfortable for us. If the sun is shining we don't need to make a fire all day in average winter weather, just in the evening. I have a lot of windows, mostly on the south side, and the house is supposed to be superinsulated (10" fiberglass in walls) but the carpenters I hired did a very sloppy job and it is fairly leaky at present.