thomas rubino wrote:Hi sonny; Welcome to Permies!
Beautiful tea house you constructed for your brother ! Superb work !
As far as your thoughts on your RMH.
Under your core will heat up too much without insulation of some kind, and eventually destroy the concrete underneath !
Under your mass will not be that hot.
Your dimensions all sound good.
Making a thicker mix of fireclay and clean sand , then spreading it by hand on each brick works better for me than dipping in clay slip.
Making a brick transition area worked better for me. Others like using a barrel, its personal preference. As long as it is large enough!
Now about your bench. Have you considered using half barrels as a stratification chamber bench rather than a piped bench? Faster heat, easier to build and no flow restrictions.
Keep us posted with pictures as you build.
Dillon Nichols wrote:Welcome to permies! Beautiful structure. Do you have a feel for how many work-hours are in it?
Thomas, do you have a reference handy for the suggested half-barrel option? I do not think I am picturing it correctly...
Brad Weber wrote:Hello Sonny and congrats on a cool design for your house. I have concerns with not insulating under the heater. I built one with the same thoughts as you that the floor would also act as mass. Boy was I right. The problem is nothing was done in advance to insulate under the cement. I see you did this also. The Earth is a heat sink and some of your heat will go through and keep going, never to return. Insulation under the mass or even better, elevation off the floor will go a long way at keeping the heat of your mass inside the room. Then the concerns of using building structure for heat. Will it take the expansion and contraction of the high heat and then cool? Was it built for that? In your case it might be fine. You will have to see. I would also like to have the chimney pipe exit higher if not right through the point. The ceiling will be the warmest there and the pipe will draw wonderfully even on cold start. Insulated pipe through the masonry and above.