We do not have any operating instructions ourselves. You would have to request this directly from the manufacturer: https://avatto-smart.com/contact-us/

If you have not already done so, please clarify this via https://www.galaxus.it/help : a solution will be proposed accordingly. :)

I can't answer this question as I don't know the devices. In any case, the manufacturer says the following: "It is perfectly suited for water and gas boilers. This battery-operated thermostat offers easy installation without a separate AC power supply. So enjoy convenient remote control via the Smart Life/Tuya app from anywhere, complemented by voice control with Alexa and Google Home. And Yandex Alice. So choose between "Automatic" and "Manual" modes."

Unfortunately, we could not find the Italian manual in the documentation provided by the manufacturer. You can find the brand's contact details at the following link: https://avatto-smart.com/contact-us/

We found the manual in Italian here: https://www.raffaellopoint.com/wp-content/uploads/2019/10/istruzioni-termostato-Rwall-wifi-hy-ITA.pdf