Glenn Herbert wrote:It's early yet for details of your third system, but you need to keep in mind that there is a limit to the length of horizontal flue you can run through the mass benches. For an 8" system, that is about 50', minus 5' for every 90 degree bend. You will not have enough length to run even halfway around any but the smallest of houses. I would suggest identifying the main gathering space and put your bench there, while keeping it open to the rest of the space for radiant and convective heat flow. The RMH generally wants to be near the center of the whole house, unless there is a zone that benefits from staying cooler.
I attempted to post a reply to this yesterday but for some reason it didn't show up .. initial plan was central RMH with a bench around the entire building but your comment about the limit to length has me re-thinking the "plan". this will be a small 2-4 person weekend hunting cabin. Cord construction, Hex building, 8 feet per side, with entrance on one side. Now thinking to place the RMH on opposite wall from the door and SPLIT the flue under the bell through TWO benches on either side of the Hex. If i keep the total CSA of both benches' flue same as the combined riser it should work right? something like this:
and i had another question .. you said "length of horizontal flue" .. what qualifies as horizontal .. I was thinking if the first section from the bell is under the bench and the two 90 degree elbows also raise the second half of the flue about 10 inches above the level of the first it might help with draft .. again still brainstorming till i play with smaller versions