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Cheers, looks like it needs a change then based on efficiency savings alone. The only feature I need from the stat is the control over internet to save 20 mile round trips just to flick a switch.

slight change of subject, could anyone give guidance on the efficiency of this age of boiler vs a modern combi from someone such as Baxi?

From attached I'm going with it being a gravity system as the blue plug is connected (second diagram out of shot shows red plug for 'fully pumped') Turns out both boilers at the same premesis are due service in January anyway so installer contacted to just do it all at the same time. Yeah they...

I have VERY Limited knowledge to be able to answer that but I believe it will be Y Plan as one of the switch positions is 'water and heat' and the other is one of those only. There is a hot water tank connected on the floor above so I believe the hot water system is gravity pressure if that's...

I am looking to Install a nest 3rd Gen onto a Thorn M120 / 150C. The hot water tank is currently not used, just the central heating so only looking to control that (but will set the hot water up if possible) Currently the boiler has a remote room thermostat (to be removed) and a mechanical...