www.pmmag.com/articles/89071-turboflue-advanced-heat-exchanger
        
        
        Turboflue Advanced Heat Exchanger
January 1, 2005
        Turboflue(r) advanced heat exchangers minimize waste heat and transfer more than twice as much heat as a bare tube with baffle. Its design makes the unit extremely strong. Turboflue technology is used in every Bock Water Heaters Inc. gas and oil water heater manufactured since 1960.
          
        
      Circle 56