Tado smartthermostat controlled opening

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I Would like to use my smart radiator thermostat to control my heat exchanger based on the outdoor temperature. I have two ideas.

  1. Can I command it to open to a specific degree, disregarding temperature regulation. Fx command it open to 60% flow in the winter and 40% in spring
  2. Can I use the thermostat to regulate heat exchanger flow based on radiator water temp = 40 degrees Celsius using an extra temperature sensor?

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