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Now, now chaps, calm down. Vaillant called me back today to confirm that their weather compensator did actually enable interlock and Simon your right that it is in some way done by some algorithms that measure outside temp, flow and return temp and your set temp. How it actually works I dont...

Thanks for the replies everyone. Thought that the whole point of this controller would be to INCREASE overall efficiency over a standard room stat, especially as vaillant told me it could increase efficiency by a further 5%. The room stat is automatically switched off when it is installed...

I've recently fit a Vaillant 838 with VRC430 weather compensator and after speaking to Vaillant had been informed that the efficiency could be improved 5% with this device. When the controller is in the boiler it is not a room stat but becomes one when placed remotely of the boiler by means of 2...