The time is coming near for us to finish the rest of our home going from 750 to 1500sq.ft. Currently we have a wood stove that I surrounded with rocks and cob. Putting the mass around it cut our wood consumption in half (about a cord now.) So when we finish the home the area the heater will be is centered in the house and from floor to top of roof is 17 feet so the exhaust will go up to 18-20ft so I should have great draft for a rocket mass heater. But I don't want the conventional, some kind of batch box is what we want so we don't have to tend it so much. How is everyone getting their box? I've seen some made of concrete (ish) material built on site and I've seen some metal box styles. I'd like to have a glass door so any links to sites to buy them would be great.
I've got a blank space to build on a L shaped wall (probably 12x12 maybe 16x12) so for the exhaust being 18-20ft in the air how far can I run horizontally and how many 45 or 90's can I do? I know there is a formula but I forget it. I'd love to see everyone's stoves and some thoughts on and ideas.
I know all about installing wood stoves properly and was a home builder for awhile and built this home also. My ceilings are flat, 10ft on the inside with 4/12 gable roof with the stove pipe coming out dead center of the house (right at the peak.) So it will probably be 19-20' from floor to top of stove pipe (considering pipe will be at least 4' above roof.) Up to 10' will be inside, up to to 6' will be through attic space (triple wall pipe) and 4' or more above the roof (triple wall also.) The perfect set up for a good draft. I also plan on building an 8" system.
Since I've got sooooo much height inside it would be best to go up but the wife likes the idea of something to sit on....but the layout might not work out right to have seating. Mostly I want to heat my home with little wood and more even temps which our current stove does but just not as good as RMH. Satamax can you add a couple links with images of the bells you speak of? I've found them on Google in the past but would like to see finished and the interior design also.
I'm in Kentucky, Northern, so I get some cold weather. It can be in the 10's (all temps in Farenheit) for a month and below zero at night for the same period and sometimes hanging around zero for a high for a week or so.
The only reason I want glass is to get an idea of what is going on with the fire without opening the door. Has nothing to do with 'looks' or 'romantic' stuff and I've had glass doors on stoves before I know they get gunked up (spent my whole life with wood stoves.)
I've read the Rocket Mass Heaters book but I'm more interested in folks that have built successful batch boxes stoves (including masonry heaters!!!) I've actually built and been around RMH's that the feed tube goes down but that's too much tending so I'm looking for less tending in mine with longer burn times
Thanks for the replies!!
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
Josh, as you will note in some pictures, it is also possible to build a vertical bell RMH with a bench added (effectively a double bell, the bench being the second). You can have enough length to stretch out on and enjoy without taking up too much floor space.
So instead of going up with the bell you lay it down? I've seen pictures of a nice build the was a bench with chamber instead of pipes. Could I start with a bench (bell) and end with a vertical bell? That would be the best layout.
Location: Southern alps, on the French side of the french /italian border 5000ft elevation
Josh Hatton wrote:So instead of going up with the bell you lay it down? I've seen pictures of a nice build the was a bench with chamber instead of pipes. Could I start with a bench (bell) and end with a vertical bell? That would be the best layout.
You need something highish to house the heat riser so, your construction can't be done. Except using Matt Walker's new riserless core. Myself, i would go brick tower to house the heat riser. Then the bench. And may be a metallic radiator at the end.
The pictures are prety much self explanatory. You can use a bench bell. But only after a tall bell, as it has to house the heat riser. Mind you. You can use a barrel too. But in my recent build. I discovered that i would like a first bell of massonry. As it doesn't release verry high heat at first, and the high heat inside charges the mass better. Due to a greater temperature differential. And the latest bell in line, to be a metal radiator, as the heat released is gentler. So you don't overheat the place before the mass is charged.
Well, you don't need as big as the previous one. Something like this over a 6 inch heat rised could well do.
Ok here's a picture of what I'm planning, rough layout. I've got plenty of room (up to 10') to go up with a heat riser so I can make it however tall it needs to be. And the length can be somewhere between 12-16' on the one wall and 10-12' on the other wall. I've added a quick drawing of that as well.
That looks like it should work quite nicely. What is the structure of the 12-16' wall? If it were masonry, you would have an excellent means to heat the rooms on both sides by using the wall as thermal mass. If you can replace some of it with masonry while keeping heat away from wood, you could get some good effect. What are the uses of the different rooms?
Oh, and what is the floor structure? Is there a basement? What are your plans for supporting the mass? A bell is a more concentrated load than a bench, and does require a real foundation, where a bench can sometimes get away with just a bit of beefed-up support.