On Feb 18, 10:24*pm, David Lesher wrote:
So I'm working on a multizone hydronic heatpump err coolpump
system.

I have the oft-encountered problem - all I have are pressure
gauges but I need to know volume. What I need are those whirling
flow indicators to put in line.

The lines are ~0.375" PEX so it's not much volume, but some
loops seem to have far less than others.

Suggestions as to sources?

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Maybe a differential pressure gauge across a known flow impedance.
(I don't have any sources.)

George H.