I assume the flow ratings are correct on the Tunze website, but just in case I thought I would ask.
Flow rate at 18 V: 900 to 2,200 l/h (237.7 to 581 USgal./h)
Flow rate at 24 V: 1,100 to 3,000 l/h (290.5 to 792.5 USgal./h)
http://www.tunze.com/details.html?&L=1&C=FR&user_tunzeprod_pi1[prodid]=1073.050
however Marine depot has these specs
Flow rate at 15 V: 800 to 1,800 l/h (211 to 475.5 USgal./h)
Flow rate at 24 V: 1,100 to 3,000 l/h (290.5 to 475.5 USgal./h)
http://www.marinedepot.com/Tunze_Si...uarium_Powerheads-Tunze-TZ1741-FIPHAD-vi.html
Flow rate at 18 V: 900 to 2,200 l/h (237.7 to 581 USgal./h)
Flow rate at 24 V: 1,100 to 3,000 l/h (290.5 to 792.5 USgal./h)
http://www.tunze.com/details.html?&L=1&C=FR&user_tunzeprod_pi1[prodid]=1073.050
however Marine depot has these specs
Flow rate at 15 V: 800 to 1,800 l/h (211 to 475.5 USgal./h)
Flow rate at 24 V: 1,100 to 3,000 l/h (290.5 to 475.5 USgal./h)
http://www.marinedepot.com/Tunze_Si...uarium_Powerheads-Tunze-TZ1741-FIPHAD-vi.html