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Underfloor heating question


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I want to implement a multizone thermostat with shelly. I will have 4 zones controlled by an H&T thermostat each, the actuators will be controlled by a Shelly 4P Pro relay for each zone, and the start-up of the gas boiler unit and the mixing pump will be done with the help of a Shelly 1 plus relay. My problem is when two zones demand heat simultaneously, and then one of them reaches the set temperature. How to proceed so that the relay that controls the gas boiler unit and the mixing pump does not stop until the last zone that requested heat reaches the desired temperature.
Thank you.

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