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Wiring please

Hi all, I have a boiler for my central heating which has a simple 2 cables thermostat switch attach to it which I use to control the heating ON/OFF depending on the temperature.

I want to use the Sonoff TH16 (with the temperature probe) instead of my existing thermostat but since the existing thermostat has only 2 cables that comes from my boiler and the sonoff needs its own power supply, I was wondering if anyone can help me please. 

I have attach a diagram and if possible write something on it for me please.

Thank you for your help.


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Hi can anyone help me please. Thank you. 

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