thomas rubino wrote:The slab will warm up some BUT the earth will never warm up and it will continue to steal heat from your core. Your firebox can be build on a perlite/clay base. Your mass can be simply built over several inches/MM thick of cob, with plenty of straw mixed in to make it insulating. Your horizontal pipes lay on top of this.
Thomas Holm wrote:ISA is to spec, approx 7,7sqm.
Mass is approx 2000 kg in bricks alone. Add to that cob/clay/stone filling.
Thomas Holm wrote:Also, it should be ok with normal bricks in the manifold area? No need for firebrick there?