A tube and shell heat exchanger in accordance 1 wherein said burner of said tube bundle and shell combination is adapted to project a flame in the direction of a burner outlet and further comprises means for automatically controlling {HEAD ~ the size} of {TAIL ~ the flame} in response to demands upon said tube and shell heat exchanger for heat 
A tube and shell heat exchanger in accordance 1 wherein said burner of said tube bundle and shell combination is adapted to project a flame in the direction of a burner outlet and further comprises means for automatically controlling { HEAD ~ the size } of { TAIL ~ the flame } in response to demands upon said tube and shell heat exchanger for heat
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