Unexpected results - higher flow = higher temps

[Hound53]

Don't know about the others. I measure it the dummy way - start the pump and see how much water gets out the other way in the bucket for 5mins. Measure it and divide by 5. This way I know its flowrate with a good approximation.

Hey that works, and is a heck of a lot cheaper than a flowmeter that you would use once in a blue moon.

Hound53 seems to be on to somthing but I dont understand a word of it lol

Centrifugal pump theory and physics 101. In every day terms. Bigger is not necessarily better. Once one of these pumps reaches it's designed maximum head pressure that is the maximum it will flow. It could be rated at 10000 gpm but if the loop only flows 1 gpm at whatever the pumps max head is 9999 gpm 's worth of energy is wasted even though it weill be doiing it's best to move that 10000 gpm somewhere.