Nest ... What replaces what

[Atif Javed]

Complete and utter noob here

I want to replace my programmer and thermostat with nest 3rd Gen

My programmer is right next to my boiler and the thermostat is in the other room

Am I right in thinking the heat link connects to where my programmer is and the actual nest thermostat replaces the thermostat

It should be a straight swap considering all the wires are there but just making sure it's the right way round

 

[muggles]

Mostly correct. The existing thermostat wires need connecting to T1 & T2 inside the Heat Link. If you leave them connected where they are you'll fry your new Nest

 

[Atif Javed]

Mostly correct. The existing thermostat wires need connecting to T1 & T2 inside the Heat Link. If you leave them connected where they are you'll fry your new Nest

Thanks

If I already have a thermostat wired to the programmer, can the same wires be used to connect the heatlink and thermostat together ? I have the programmer in my utility room and the thermostat in another room

If not wireless would be an option

I don't want to have another wire connecting the heatlink and thermostat together

 

[RandomGrinch]

If I already have a thermostat wired to the programmer, can the same wires be used to connect the heatlink and thermostat together ?

As has been said above, you may be able to use the same cable to power the Nest thermostat - however, the thermostat cable is likely to be connected within the wiring centre (the plastic box below the programmer).
Some wiring changes will be needed in the wiring centre and possibly an extension cable run from the old thermostat cable to the Heatlink.

If you are happy to (with the power off), post some good photos of the wiring within the wiring cente, behind the programmer, and behind the thermostat, and we may be able to help you work out what goes where!

Alternatively, the Nest thermostat can be run from a USB power supply. The old thermostat would then need to be turned up to maximum, or if you wanted to remove it completely, the cable would still need to be linked out in the wiring centre.

I hope that makes sense!