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I actually measured the difference between a Blueline and a T4 on my systems - with about 160 g of water the temp rose 1-2 deg F with the Velocity. I added a fan and left it on overnight and it plunged the temp down to 71 deg!!! (from 82).
So, now I have it on a Temp controller - the fan comes on once in a while on a hot day, but is mostly off. The pump is not powerful enough, but the Blueline I had was too powerful. The Velocity is by far the quietest pump I have ever come across, but it did add a bit of heat - not too much.
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