Hello and thank you for your question. As far as I could understand, the Netatmo after-sales service never answered me, this product is designed to work with a boiler, the Radio/Wifi relay and possibly the additional intelligent thermostatic valves of the manufacturer. This product was not suitable for my use (rental building with central heating) I returned it to the seller. But according to the videos I could find on the Netatmo website it is designed to be connected with 4 wires (230 volts power supply + boiler control) on the heating system. I'm sorry I can't tell you more