Viessmann vitodens 100w system boiler

Hello. I’ve had my old ideal boiler replaced with the above. It is an unvented system with S plan wiring. I have the tado smart thermostat as well as extension kit adjacent to the boiler. I’ve been advised that I cannot use opentherm with this boiler when on S plan system. I went to be able to maximise the use of boiler modulation through Tado. Does anyone have any experience of this boiler with tado?


  • Good afternoon, did you resolve your problem?

    I am have the same issues.