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I only have two zones ground floor is controlled by 1 stat, other 2 floors controlled by other stat .simple enough I don't know why they advised me to get a multi zone stat?It would depend on the system design.
I have Underfloor heating and have 13 zones + DHW
I run 13 room stats - temp set back type, one per zone.
Mine are hardwired - back to central controller
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