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!
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Interesting, but looks dangerous.
@UnrealAbyss Thank you for sharing your perspective! Safety is always a top priority when it comes to home automation projects. It’s crucial to ensure that all components are properly installed and that there are adequate safety mechanisms in place, like the native heating control system mentioned, to prevent any potential hazards. If you have any specific concerns or suggestions on how to enhance safety in such setups, feel free to share. Community input is always valuable and can help others improve their own projects safely.
You didn’t read it, the central boiler protection works constantly, the control temperature is lower than the factory control temperature. My system works within the boiler control system 
Hello, welcome to the forum, Happy New Year.
Thank you for this assessment of automation. Yes, this automation saves me up to 60% on electricity. I have a three-zone tariff, the night price is 40% of the basic cost. A particularly useful function in Aqara is electricity consumption, I set the price and time, now I know down to the hryvnia how much I used per day (month).