NEST thermostats
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Caporegime
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What is the heat link unit actually for sorry? I have a combi with an old dial thermostat in the hall, no controls apart from the boiler, and I'm looking to do a straight swap for a Nest unit. Can I just unplug old and wire up the Nest without any extra wires trailing around?
Do not connect the boiler straight to the Nest as you will kill it! The nest uses low voltage (5-12v) and normal thermostats are 230v in this country.
The heat link connects to mains power (230v) and will bridge the call for heat on the boiler when the Nest requests heat. It also has a choice of a 12v wired output to the Nest or a wireless connection.
The heat link connects to mains power (230v) and will bridge the call for heat on the boiler when the Nest requests heat. It also has a choice of a 12v wired output to the Nest or a wireless connection.
Caporegime
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- 13 May 2003
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- Warwickshire
Ah right, thanks, so the heat link is just a step down transformer? They could have made the UK nest 240v! 
Ah right, thanks, so the heat link is just a step down transformer? They could have made the UK nest 240v!
A bit more then that though, you couldn't swap it for a transformer. They could have done but it would have been more expensive. Think of the Nest as a smartphone that controls the heatlink as it essentially is, it even has a little battery in there.
Caporegime
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Ah, OK, cheers.
Just been out to my combi to look for the switched live coming in from the thermostat, and can't see it anywhere. Where should I be looking? There's loads of info about sticking the Nest unit on the wall, but hardly anything about connecting up the heat link :/.
Underneath of my combi looks like this:
Does it come in through the FCU? So do I just need to splice into the white wire on the left? Thanks.
Just been out to my combi to look for the switched live coming in from the thermostat, and can't see it anywhere. Where should I be looking? There's loads of info about sticking the Nest unit on the wall, but hardly anything about connecting up the heat link :/.
Underneath of my combi looks like this:
Does it come in through the FCU? So do I just need to splice into the white wire on the left? Thanks.
No. You'll need to access the wiring inside the boiler by taking off the front cover. You need a permanent live, a neutral and the call for heat (will be a neutral). I suggest getting someone who knows boilers to connect it up.
Had our old Potterton/immersion/tanks etc ripped out and a shiny new Worcester Bosch 29CDi installed over the weekend. Nipped straight out and picked up a nest to control it all.
I've not read the instructions yet. Was getting tired last night and the concentration started to wane!
Am I right in thinking I take the 230v going into the boiler and plug that into the Nest, and then the Nest into the boiler? Effectively putting the Nest in line? Or do I need a seperate supply to each and then just run a call for heat wire?
I've not read the instructions yet. Was getting tired last night and the concentration started to wane!
Am I right in thinking I take the 230v going into the boiler and plug that into the Nest, and then the Nest into the boiler? Effectively putting the Nest in line? Or do I need a seperate supply to each and then just run a call for heat wire?
Nice choice on the boiler, I've had my Nest connected to my new Worcester 38CDi and it's been great. Trifid mentioned above you need to connect the Nest Heatlink Box to the boiler by taking off the front cover and connecting the relevant terminals. Once the Heatlink is powered by the boiler you can then either run a separate power wire from the Heatlink to where the Thermostat is gong to be installed giving it direct power or alternatively power the thermostat with the included wall power plug.
If you are unsure how to wire it then get a professional in to do it, especially if you've just had a new system put in
Thanks, my Dad's a plumber by trade so made the recommendation (and wangled a good deal on it!) in line with what I'd read on here. Was worried the 29 would be a bit down on power, but it's doing an admirable job of heating and supplying hot water. Amazing the amount of stuff we ripped out too!
Right, gotcha. So the Heatlink gets it's 240V from the boiler, just looking at the 29CDi instructions and I can see Ls and Ns (live and neutral supply) going out to an external control option. So that powers it.
Then, coming back from the Nest there's a LR (live return) (3) that goes into LR on the boiler. Then I just do a small bridge from the L to (2) on the Heat Link.
Happy to run the stat wirelessly, the existing stat wiring goes to the kitchen where the boiler used to be. It's now in the loft, where I've only got CAT6 running. That said, it's <12v and CAT6 runs 48v POE... meh, wireless!
Right, gotcha. So the Heatlink gets it's 240V from the boiler, just looking at the 29CDi instructions and I can see Ls and Ns (live and neutral supply) going out to an external control option. So that powers it.
Then, coming back from the Nest there's a LR (live return) (3) that goes into LR on the boiler. Then I just do a small bridge from the L to (2) on the Heat Link.
Happy to run the stat wirelessly, the existing stat wiring goes to the kitchen where the boiler used to be. It's now in the loft, where I've only got CAT6 running. That said, it's <12v and CAT6 runs 48v POE... meh, wireless!
I installed my nest over the weekend and noticed this, this morning it was saying 20.5 but it felt colder than that!
Have you found a solution?
Since the £100 is to leave a contract early I assume there is nothing to stop people moving to a new provider the day after installation?
How are people finding their Nest? I keep looking at one but my biggest issue is I have rooms that get hotter than others. My living room has two big radiators so rooms like the hall way (where I would put the Nest) is much cooler.
Hard to say, weather been so mild. The heating barely been on.
Although the auto-away feature works will, bound to save money. However, that also means the heating off when you come home. Can switch it on remotely....if you remember.
I'm planning to buy a nest in the very near future but don't want a pro to come fix it.
There's not too much info on installing the heatlink to the boiler on the web and i was wondering if any of you guys could give me some advice before i buy it.
I have a gas boiler that is connected to a programmer and have an old mechanical thermostat.
can i install the heatlink near the programmer and if so does anyone have any diagrams to show how it connects with the programmer (which i still will need for the hot water)
the programmer is no where near the boiler, the same with the thermostat.
Cheers guys
There's not too much info on installing the heatlink to the boiler on the web and i was wondering if any of you guys could give me some advice before i buy it.
I have a gas boiler that is connected to a programmer and have an old mechanical thermostat.
can i install the heatlink near the programmer and if so does anyone have any diagrams to show how it connects with the programmer (which i still will need for the hot water)
the programmer is no where near the boiler, the same with the thermostat.
Cheers guys
Damb wish I had seen this earlier! Just moved into a house who were with Npower, but I'm switching to Co-op on the 10th
