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 {HEAD ~ means} for automatically controlling the size of the flame in response to demands upon said tube and shell heat exchanger for {TAIL ~ 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 { HEAD ~ means } for automatically controlling the size of the flame in response to demands upon said tube and shell heat exchanger for { TAIL ~ heat }
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