Once the stock turbulators were removed I saw a 3c drop in temps while using my Eheim 1250 pump. The block was run as an open channel block. I then decided to add my copper coils to add turbulance within the block. The coils are small enough not to restrict the flow but to drop the temps another 1c. Over the open channel block I only saw a drop of 1c.
Now I doubt that if another smaller pump is used anyone would see a difference. I have always based this info. while using a 1250 pump with it's 28 watts.
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