Home DIY

Thanks so much for the reply. So I can set the general house temperature on the vaillant control/thermostat that comes with the boiler, and use the tado smart radiator controller to set a different temperature in the baby room?

It might be possible to do it that way but the radiator controller will not have the ability to 'call' the boiler for heat as the home wide thermostat is controlling when the boiler fires and I'm not sure the Tado rad controller will talk to it or not. A 'dumb' TRV valve will achieve the same thing, with less spend.

If you replace your existing controller with the Tado smart thermostat, and fit a smart radiator valve in baby's room, the smart radiator valve will overrule the thermostat and make the boiler fire if baby's room gets too cold.

This will have the side effect of heating the rest of the house too, so make sure you have TRVs or smart radiator valves on other radiators too. Towl and bathroom rads get a free pass, obvs.

This stuff is weirdly complex; there's loads of ways of achieving roughly the same thing. I just gave in and put Tado valves on everything so every room has its own zone and can be controlled independently of all the rest, it's own schedule, heat level, settings etc.