Daox
I wonder if a spacing of tube 6" placed in a plywood groove with a ceramic or porcelin tile thin-set down would conduct heat well enough without an aluminum spreader. I know that a floor-cover of tongue and groove wood would be useless or god forbid carpet but I would bet that a hard surface such as for-mentioned tile would act more like the Cadilac concrete slab.
Maybe some one could try an experiment with a small section to see how well the heat would propagate through the tile.
Randen
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