Got a vaillant 831 combi, it has a wired room stat fitted.What sort of job would it be to disconnect it and have a wireless type?.or would this ba corgi job?
Not a Corgi job, and it shouldn't be too difficult. You need to refer to the wiring instructions in the boiler manual and the instructions for the wireless room stat. You can download these from the appropriate manufacturers' web sites. As far as I know the wireless stat will have a base station which will hard wire in to the same connections as the existing room stat, but check this.
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