On the ground stone floor heating

Im thinking about doing this but with an "on the ground" stone floor, using stone instead of pipe for the channels. Would love some ideas thrown at me for the design.

Hey Lara,
can you specify what you mean by "on the ground"?

You want to build a rocket mass heater and use your floor as the mass? And you want to build the ducts from stone?

If the stone is laid directly on the ground, most of the heat will go there via conduction. In a mild climate this might work, but anywhere that has cold winters will probably produce disappointing results. Getting a layer of insulation under the floor would be the way to go. I know a natural builder who has used a layer of biochar to do this, and put an earth floor on top of it. If you ran your heating tubes through the earth layer and put stone on top, you might have a solution.