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