Hey guys looking for any ideas and help in monitoring a bunch of Honeywell low voltage water valves. I have my brother's house that has hydronic floor radiant heating. There are 12 zones in all and all the valves are centrally located. Each valve has a simple Honeywell on-off low voltage 12vac thermostat that controls (energizes) the valve to open whenever it gets too cold in the room.
Instead of installing 12 zwave thermostats which would be ideal but that is cost-prohibitive. I was thinking there might be an easy way to simply monitor the valves 12vac power that would at least tell me whether or not there is heating being asked for at one of the zones. Does anyone have any suggestions on monitoring the status (not analog value but binary on whether there is voltage present or not)