[Joshinator99]

Originally Posted by JSH

I agree with carrying the 1" dia. throughout the system, which mine doesn't do now. I would like to take credit for the reducer idea, but that came from Mont MS. The velocity of water increases while flowing from the 1.5" pipe to a 1" pipe through the concentric reducer I'm proposing because the area available for the water to flow through is reduced. As the area decreases, the water is forced to flow at a faster pace to be able to pass through the smaller pipe.

The reducer idea should also work on the pump discharge.

FYI I’m an HVAC Engineer by trade, so trust me when I tell you your pump selection and pipe sizing will have way more impact on system velocity than a short piece of reducer. Focus on supply and return differential not “velocity”, which technically does nothing for you. As long as the flow is turbulent and not laminar, you’re good. I’d shoot for 10-20 degrees off temperature differential between supply and return.