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The bottom of the boiler states 24kw i reckon here is the label...could be wrong as I'm not an expert

Thanks @hertsboilers I called Vaillant who were also mystified when I talked them through the situation and checked settings such as D0 (which they said is correct to set at 18 not 24). Perhaps a simple wiring issue so will call the engineer back.

It was here when we moved in. The wireless thermostat is new. I have tested that and all appears to be reading correctly. Simply a case of the boiler switching the heating on when the demand isn't there... Should I try anything else?

??? I am not sure what you mean here...Vaillant ecotec plus 831

Hi I have an ecotec 831 combi 24kw hooked up to a honeywell wireless thermostat. Seems that the heating kicks in even when I have set it not to, making the house constantly warm and wasting the heating bill. Theres 10 rads in our 4 bed house. Ive set the heating to 60 degrees and water is...