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