Ok guys(hope I can say that without offending), I do understand fire. Heated with a Franklin stove for years. Till my heart problem started, heating with wood warms you up several times(cutting, loading, splitting, stacking, even the clean up) then there's the fire. During an ice storm several years ago, lost power for ten days in this new fangled all electric house. Was able to maintain low fifties using several oil burner candles, family headed for town(I went to town to watch super bowl).

But the idea of intensifying heat with a clay pot still mystifies me. Btu's in Btu's out - conservation of energy, just didn't add up. Better half should me u tube of man calming to have solved energy crisis with candles and clay pots, filed it with perpetual motion(which I know cat claims to have). Quess I must see to believe.

Side note, headquarters(underground), ten days of dark low fifties, like suspended animation no problem.

But I have a good supply of smoke at all times, so my vision can be blurred at times!!:jointsmile: