I have Tado thermostats on my radiators but I also have a non-smart thermostat in the basement, controlling the heat exhancher for the radiators. I can save a lot on my heating bill by adjusting the exchanger thermostat for the seasons and closing during summer. I do this manually, but would like to do it automatically and instead use a smart themostate for heat exchanger, but I struggle to see how it could work.
Setting a temperature will not work since I probably cannot influence the outside temperature ;), and using heating or off states is too rough. I would instead like to be able to set fixed levels instead and disregard temperature regulation. For instance levels of heating from 1-5. Is that currently possible?