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A bit of both.

That is certainly correct - they are essentially a couple of switches but then again so is a programmer & a thermostat. The main benefit I gain from having Nest is being able to configure the schedule easily from my phone and make minor adjustments when needed.

Do I detect you're not a fan of these new stats like Nest & Hive? :rolleyes:

It's on page 9 in the document below but I've just seen the URL while posting it here and it's an old version of the manual. I've now found a newer version of this document (which relates to my actual boiler) doesn't show the pump as being connected directly to the boiler so as PullerGas...

It's pretty common to install things like Nest & Hive to replace existing thermostats & programmers - certainly not un-common on our new estate. If anything, their exposure under a warranty is lessened because faults with room stats and the programmer aren't going to be their problem at all.

Thanks Richard. I've just installed a couple of Nest thermostats which is why I've been "poking" around in the wiring centre (to replace the existing room stat connections). General curiosity about how these things worked is what triggered my enquiry about the pump overrun. I thought it was...

Hi there, We recently moved into a new build house with a Logic Heat system boiler and I've just been reading through the various manuals for it to familiarise myself with these things and have noticed something that says that the central heating pump must be connected directly to the boiler or...