can I use one t-stat to control 2 zones

heatingFun

My new zone t-stat is not available yet. I am wondering can I use the existing t-stat to control the new zone as well by branching the wire to the new zone pole?

hot_rod

So one thermostat to operate 2 zone valves?

You need to determine the current draw of the valves and make sure the thermostat has the capacity to switch that load. That info should be labeled on the zone valves, and on the I&O manual for the thermostat.

Another method is to tie the stat to a relay control, then to the zones.

HDE_2

Or easier yet, manually open one zone valve, letting flow happen when other operates

heatingFun

I am using circulators, not the zone valves.