yes well, theres the dillema.. even your design will have a hot spot near the rear of the furnace.. that fire brick will absorb alot of the heat, and the entry (front) will be a considerable ammount cooler. really, you need more than one burner to disperse the heat more evenly. As you've said, you do not want to heat with the flame, but it is nearly un-avoidable with this sort of system. If you had a seperate air heating furnace that circulated the heat through the box at high temps, thats different.. but highly un-efficient, and you could just as easily be using salts..
seriously check out Don foggs.. I'll root around for the picture.
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Deep poetry-
A monk told Joshu: "I have just entered the monastery. Please teach me."
Joshu said: "Pull my finger."
At that moment the monk was enlightened.
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