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I got the thermostat E, because I can install it myself and don't need to go into the boiler. Would I benefit anything from the 3rd gen? From the looks of it they have similar features. Any idea on wiring, where should each wire go?

Of course the Nest installation wont go smoothly. The naming of my wiring doesn't seem to be part of nest app. So I have no idea which way the wiring should go now. And I can't seem to find similar setup or wiring on this forum or any other. The Ecotek plus 418 is connected with Siemens RWB9...