How far down can this heater be controlled? Can it be set to 5°C, for example? (frost protection)
Does the heating switch off again after the temperature is reached or does the fan continue to run?

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Answer

Hello, it's a heater that stops either after a certain time, or after the room temperature has reached the desired temperature. 
For the minimum temperature, you can't set it to 5 degrees. It's better to set it to 20 degrees and run it intermittently for a few hours a day.

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Question about Xiaomi Smartmi Fan Heater

How far down can this heater be controlled? Can it be set to 5°C, for example? (frost protection) Does the heating switch off again after the temperature is reached or does the fan continue to run?