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Zone by Zone system run time.

I have three Uponor WT1 thermostats controlling six Uponor MVAs for three zones. The end switches the the MVAs control a TACO SR501 which controls the circulator. A simple hour meter paralleled with the pump shows me the system running time.

I would like to know the running time for each of the three zones. Rather than trying to couple something to the MVAs I thought it might be easier to measure it at the thermostat end.

Does anyone know of a 24VAC 2 wire replacement for the Uponor WT1 that would have a time measurement function? Or am I barking up the wrong tree?

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