Hydor ETH 200 Flow Rate?

DarkSoul

Mad Scientist
Mar 12, 2007
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London, Ontario
What would be the suggested flow rate for optimum performance of these heaters?

I intend on moving about 200gph through one, will it still be able to heat the water for my 50 gallon effeciently... or should i invest in another just to be safe?
 
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