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Tying together 3 hydronic zones to be switched by one thermostat
We have a small house we recently purchased and there are three zones upstairs (and one in the basement). I installed an Ecobee thermostat on the main upstairs zone. There are two other 'dumb' thermostats upstairs. I'd like to tie together all three upstairs zones so that when the Ecobee calls for heat it opens the valves for all three upstairs zones.
My boiler uses a Taco ZVC 404 controller.
Can I just tie together in parallel the sets of T/T wires like this?
Thanks in advance for any assistance / recommendations.