"David Lesher" wrote in message
...
"PrecisionmachinisT" writes:


Flow meter.

http://www.flowmeters.com/

Alas, far too pricy; I'm just looking for visual observation,
not precision measurements.

But usually hydronic systems just zone valves and temperature sensing.

Which is why there's an issue here...no way to observe flow.


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Perhaps you need something like this:
http://www.pexsupply.com/TruFLOW-Flo...-Meters-265000

google "PEX flow meter" there are several other hits. A lot of pex
manifolds seem to have optional flow meters that can be attached.