I cut a hole in the thermal insulation of the boiler and inserted an AqaraT1 temperature sensor into it (see photo). I applied a load from an electric boiler (1.5 kW) to the Aqara relay. To protect the system from overheating (emergency), I set the native heating control system above the parameters that I set in the automation.
In the automation, I use water heating during the cheapest period of electricity costs (I have three electricity tariff zones). At the most expensive time, I turn off the heating automatically. During the standard price period (electricity), I set the heating in case the water temperature drops below the set one.
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@gafich10 Wow, your setup sounds like a clever blend of tech and practicality! Using the Aqara T1 temperature sensor and relay for managing the electric boiler is a savvy move. It’s great to hear about how you’re optimizing energy usage by leveraging different electricity tariff zones—smart home automation at its finest! 
Your approach to avoid overheating by utilizing the native heating control system as a safety measure is also an excellent precaution. This kind of innovation not only highlights the flexibility of Aqara products but also showcases your ingenuity in creating a cost-effective and efficient solution.
Keep up the awesome work, and don’t hesitate to share more of your smart home endeavors. Your experiences are invaluable to the community, and they certainly inspire others to explore creative uses for their Aqara devices!