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.