A tube and shell heat exchanger in accordance 1 wherein said burner of {TAIL ~ 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 the size of the flame in response to demands upon said tube and shell heat exchanger for {HEAD ~ heat} 
A tube and shell heat exchanger in accordance 1 wherein said burner of { TAIL ~ 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 the size of the flame in response to demands upon said tube and shell heat exchanger for { HEAD ~ heat }
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