Nest dual zone installation - how to install 2 Nest thermostats on a heating system 

This video was amazingly useful!!! It helped me save a couple of hundred quid for the installation. Many thanks! My dual zone nests work perfectly!

I love your videos. They break everything down so clearly. I actually feel confident trying it myself now instead of leaving it to my sparky.

Awesome video, thank you. I fully installed myself, followed each step and no issues thanks to you

Best video on dual heating system I’ve found. Thank you.

Thank you for this video! Your clear instructions enabled me to fit 2 Nests which I've been putting off for months because I had no idea how my new home/boiler was setup. Wish I'd found your video earlier 😄

Excellent video & very clear. Thank you 👍🏻

Thanks for the video, mine has 2 thermostat controls (Danfoss TP5000) with 4 wires each. 1 Earth 1 Live 1 Neutral 1 Switched. The switched went from terminal 3 on the nest to Brown on the valve like you said. Thanks. 👍🏻

fantastic video. thanks. I'm a heating engineer and never installed a nest. they look good quality products. very well explained. Good job.

Awesome video mate, thank you

Great video, clear and concise.....well done and thanks!! One point to note for those doing this for the first time: I had an issue with the hot water always being on and after research found that the Bacterial Prevention setting was on, which turns the hot water on if it hasn’t been on for a while. Obviously on a new install it thinks it hasn’t been on for a while. I turned this off and it works fine now!! A note to anyone having the same issue!!

I did it without this video but this video is so comprehensive. I understand what I did now!

Excellent very clear and useful guide, thanks

So easy and perfectly explained. Subscribed to your channel.

Installing my dual zone heating set up was so easy thanks to your vide. Thanks buddy it would have been a lot more stressful without this.

Great video well done 👍

Absolutely fantastic video. Very clear and looks easy to follow. I've switched Combi boiler single zone thermostats before but I'm buying a house with a system boiler and 2 zone. Thanks for explaining clearly. It'll save me a lot of working out

Hi ur videos r very helpful i learn a lot form ur videos thanks u r doing a great job

now I know I'd definitely get someone competent in to do a Nest!

Enjoyed learnt happy thanks

Can the secondary nest control the boiler through the first one, without connecting them both throug wire?

Thanks for explaining the jumper links from active to common. I had assumed that that link would be made inside the unit. No matter. My question concerns inslab wired heating. Will I use connections 2 and 3? I explain to myself that the nest thermostat will stop and start the power via the heat link's relay. So many questions.

Brilliant video! Everything was explained perfectly. I do have 1 question though, I have a combi boiler with no water tank and a dual heating system. The boiler has a black and a grey wire which I have traced back to the zone 1 controller. Do I completely disconnect these 2 wires and put a link wire between the terminals? They are labelled on the boiler as ‘room stat/timer’. I have read the manual for the boiler and it looks like there is a link wire between the terminals from the factory.

Great video, very informative. When using a nest on a three zone system ie, downstairs, upstairs and Hot water , can you control Hot water from both of the thermostats or only one of them.

thanks for this video and both S and Y videos, I am trying to figure out installation of nest 3rd gen with District heating, I have two thermostats for heating (one upstairs and one downstairs), the District Heating boiler in the garage with froststrat, and upstair a wiring board with two valves in the airring cupboard, would be great to get some advice or which video to follow

Simon what knowledge ❤

thanks for this video! managed to get my 2 zone nest system set up and running in a few hours, it would have been faster if the terminals weren't so small!!!

Brilliant, thanks.

Great video with a follow up question: How to best to connect a Nest 3rd gen to Zone 1 (boiler) and A/C system (furnace in house is used exlusively for cooling). Seems somewhat obvious, however, just wanted to verify that I am not over looking a potential problem.

Thanks great tutorial saved me 80 quite.

Hi, brilliant video! If using a combi boiler and wanted to zone just the towel rail could I use the hot water as the zone for the towel rail and just have no thermostat on it? Meaning I’d just need the one nest.

Thank you for a video. Which valves would you recommend for multi-zone Nest heating setup?

Hello. Many thanks for the video and the explanation. Tell me. Is it possible to have two nest thermostats connected to a a single heatlink on a combination boiler. ?

Fantastic thanks a lot 🙏 you save my life Wished you would have put both nest thermostat on to see if the light came on If it was combi boiler then it would have been bingo

Thank you so much for this video, ive liked and subscribed - really helpful. Just one quick question - if ive mixed up the Nest with the valves is it just a case of swapping the wires from terminal 3 to the brown wires in the wiring system? thanks again

thanks,very helpful

Excellent video. Could you please tell me what make/model of wiring centre that is? Thank you

Great video. Thanks. 1 question. I have this set up but the thermostat that controls heating and water is also connecting wirelessly to the second heat link and is therefore activating both heating zones. Is there a way of stopping it connecting to the 2nd heat link?

What skill ❤

Hi I followed your tutorial on a 2 zone and cylinder system boiler and I get error code e4 on nest thermostat,any ideas? Thanks

Hello, great video! I have 3 wirless thermostats for three zoned floors - am i correct in thinking that I could add an extra heat link for the 3rd zone and use thermostat stand to satisfy my requirements - do you see any issues with this?

Great video, thank you, I have a 2 zone combi boiler, I’ve looked in my wiring panel and I have the live - neutral - earth from both valves, but I only seem to have 1 live and neutral coming in for the programmers ? Is this normal? I can’t seem to add a photo to show it. Thanks in advance, Carl

HI, great video. Im looking to do a fresh install, would you know where I can get a diagram to start from scratch?

Great video, thank yoi

Thank you for dual zones wiring installation videos, I would appreciate it if you could upload a video for an underfloor wiring center and nest thermostat installation for radiators to combi boiler.

hi, could you please explain if i have a system boiler with 4 zones, how do i set it up. Which thermostate would be setup as system and which as combi? Thanks.

Would it be easier to wire a 5 core flex to the heat link from the wiring centre? Then you’d a neutral connection, L connection, 2 can be joined with permanent live in the wiring centre, 3 can be joined to the brown of zone valve & earth connection connected up. Would that be an easier option instead of installing a link between L & terminal 2? The cable connection points are so small it’s difficult to get two cables in

Hi great video and very easy to follow! I’ve one question can the hot water circuit be wired without the cylinder stat in place ..as in just open and close the hot water valve? Getting cables to the cylinder is near impossible for a cylinder stat…thanks again for such a great video

Nice vid. Question: my hot water is totally separate system. So can I use the 4/5/6 outputs to control second heating zone with temperature read from room sensor? So I will then only need to buy one nest/heatlink to control two heating zones?

Great video! Is it possible to utilise 2 nests and heatlinks with opentherm?

Hi I have a two zone system with system boiler but I have two system programmers only one wireless thermostat the other rads in zone 1 run off thermostatic valves presumably I'll remove both programmers and replace with two heat links as long as I set one up as combi boiler and the other with the hot water as a system boiler going through the cylinder thermostat that would work?

1st class content

great video , thanks . I have 3 to fit in a biiiig house one for hot water and downstairs one for the second floor and one for the gym..... .is it the same principal for 2 or 3 nest ?

Hi great video. If I have a two zone heating + HW and I only want to replace the downstairs zone with a nest I would have to leave the existing programmer in place for the other zone? HW could either stay or be moved to the nest?

hi, what happens to the HOT WATER OFF cable from cylinder stat? thanks

If we have two zone programmable thermostats and a combi boiler (new build) Do we need to install 2x Nest heat-links or can we simply remove old programmable thermostats and fit 2 new Nest thermostats using the same wiring?

Little confused by last step in wiring process with regards to switch from water tank, can you advise further with clarity please.

Good video mate.. really excellent presentation. Can you do a video of how you set up your test rig please.. that would be so cool. Thank you

Brilliant video, I have done my best to follow it but am struggling with the power supply to the boiler. Does the boiler get a permanent power supply? Not sure how the nest controls the boiler??

Hi, is there a wiring diagram for this entire setup? Can someone send me a link to it if there is please? Thank you🙂

Very good

Great video, my system has 2 standard thermostats which control each zone, I get that these are replaced by the nest thermostat. But I also have a programmer thermostat that can control both zones and the hot water. Does anything need to be down with this programmer ?

I have 2 air handlers and 3 thermostats.... do I need 3 nest thermostats

Thanks for video. Explained in all details how to wire up and make that work. I just wanted to ask, does Nest prioritises hot water first? For example if there is call for DHW on 2nd Nest, and call for heat on Nest nr1, will both zone valves be open, or Nest's communicate together and prioritises hot water first until it is satisfied And only then opens zone valve for heating? I am going to install the system with unvented cylinder and 2 zones, (radiators and underfloor heating), and I have chosen Nest over Evo Home from Honeywell as it looks more modern and user friendly, but I am afraid that heating will work same time with DHW and will take ages to heat up the water. Thank you

Hello, very good video.I have a question, can you control the 2 zone heating (downstairs and upstairs) and External hot water tank without having installed 2port zone?instead I have a Dab pump on each zone which has only 3 wires. Can the nest thermostat control the pumps independently and tell the boiler when to stop? What diagram should I follow form the booklet nest thermostat? Thank you!

Has anyone had problems adding 2 stats ( Nest gen 3 and Nest thermostat E) to the same home account. Mine just comes up with a fault code, only way to do it is open second home account on the app and add second stat. Not ideal but only way I could get it to work.

Thank you for the video. I am currently studying ACS. I created a board like yours. I managed to wire S plan. And Y plan. Do you have wiring diagram for the two heating zones and hot water? Thank you again for your video

Hi Can you have multi zone open therm if you boiler is compatible If so would both heat links run wires from OT 1 and 2 up into the boiler and connect to the same place Thanks

Hi great video I am in the process of sourcing a system boiler and hot water cylinder tank for a zoned system of 2 heating zones underfloor heating i believe its two zone In the video you mention open therm doesn't work with system boilers I was looking at opentherm in particular as I understand this would allow better control of the hot water cylinder ? And boiler Is this definitely not possible so wouldn recommend not searching for an open therm boiler and cylinder Or would it make sense to get an opentherm cylinder and connect the ot terminals from one of the heat links to this in addition to whatever heating zone its controlling seems honeywell evo therm is the one solution but quick glance that has limitations too

Thank you for all the videos ive watched a few of them, i have a very similar setup however im having trouble getting the second thermostat to fire the boiler up. Its an S Plan Plus setup with 3 vales, Water, Zone1 (downstairs), Zone2 (upstairs) Zone 1 & Water are controlled by a Nest 3rd gen, its wired exactly as you example with the jumpers from L to 2 and 2 to 5, it works perfectly for heating and Water. Zone2 was controlled by a Danfoss Tp5000 and the upstairs radiators only got warm if Zone1 was also on, regardless of the upstairs temp. I have just replaced Danfoss that controls Zone2 with a Nest Thermostat E, as i thought this would be fine for heat only. However im still having the same issue, the boiler doesnt fire up unless Zone1 is activated... then the whole house is heated up. Any thoughts greatly welcome :)

Hello, great video. I have a two zone (up/down stairs) combi boiler set up. I have two Nest thermostats which I’d like to install. Can I have downstairs (zone 1) wired to opentherm and upstairs (zone 2) wired to standard on/off? Also if you know, why can you not have a two zone opentherm set up? Many thanks in advance.

I have a single programmer that currently can turn on upstairs, downstairs and hot water independently. Is it possible to mimic this with a single nest link or will I need two?

A note of sincere thanks for this video, I installed 2 x Nests in a heat-only system / boiler dual zone home (done several Gen1's with Combi's in the past w/o issue - system boilers are more involved). 1st main stat was a doddle thanks to the video, with 2nd zone one, though technically simpler than the 1st, taking longer as the 2nd clock was battery operated (no mains) so I needed to rethink the heatsink locale (where I'd pre-planned & agreed it) - just as per one of the examples in the video but needed to utilise 2 wires therein for the 12v nest p/s & which were not in terminals that I expected (expected common to be live and switched to be o/c but it was the other way around - but this didn't really make any difference to the install once I'd traced them in the wiring junction box to re-purpose & then took wires off from there to the new heatsink locale. Of course, I discovered other unrelated issues with the system (no pressure, rad's that needed bleeding - but without pressure, they didn't bleed well of course; loss of pressure was 2 poss 3 rads which had leaked in the past & so didn't want to normalise pressure until the rads leaks had been resolved (as under higher/normal pressure, the rad's would continue to leak - they may well do when they warm up anyway. The system also needs balancing too as at one point when pressure was normal & apparently no bleeding required then, 2 rads remained cold on full tilt / try's open etc & in the same zone. Anyway, the Nests are working a treat and this video helped me get it straight in my head before I opened the nest boxes - so a million thanks. I have my own home to do soon - which I think is a similar set-up so again thanks for that too!

Great instruction. Thank you. Two question I have. In this setup when there be a demand for heat from both nests how two volves will open and the will be double signal to turn on the boiler. Will that hurt my boiler? 2nd Question. You said that OT will not work with 2 zone system. Ok. But what do I lose without OT functionality? Thank you for your answers.

It’s crazy that nest still doesn’t have a dual zone (ground & 1st floor) plus hot water. 3 output units yet.

Can someone reply to this comment with a link to the wiring diagram for this setup please? Thank You

Hi , would u wire up the same on hive dual zone but without the 12v feed going to the thermostats , thanks

If you had a dedicated pump for each heating zone, say a under floor heating circuit on the ground floor and a radiator circuit up stairs, would you connect the feed to turn on the pump to the orange of the motorized valve for that heating circuit? So as the zone valve opened and power was sent on the orange wire to bring on the boiler it would also turn on the pump for that circuit.

So if the current thermostat is in a bad position just above a radiator then what options do I have if buying a Nest one. Can it be moved? What happens to the old wires?

Hi, one question is it as simple with a pre wired unvented cylinder?

Great video! One question.. if I have a programmer, what do I do with the wires, or can I just leave the programmer on permanently on??

What’s the best smart system to control Underfloor , rads 1st floor and hot water

So to heat two zones u need two receiver and 2 thermostat?

Do you need to link, or could you take another spare live feed from the wiring centre to terminal com 2 and terminal com 5 or does the link from Nest L communicate with com2 and com5

In this setup is it necessary to have a cylinder stat? Isn't that something that can be controlled by/with the Nest?

Hi there, I have a dual zone heating system with a hot water cylinder. I have hot water and zone 1 wired to thermostat1 and zone 2 wired to thermostat2. Is there anyway of controlling water from both thermostats ? Or jsut thermostat 1 ?

Hi mate, I have a job where there is 2 heating zones but they only want to control 1 zone via nest (s plan) would the wiring in the wiring centre stay the same for the heating zone they don’t want the nest on?

Hello We have managed to set up our two nests on an on/off combi boiler and when we tested them, we’ve confirmed that each heat link is connected to the correct thermostat and that the correct valve operates for each heat link respectively. However, when we had the upstairs thermostat set to 15deg (eco) and downstairs set to 23deg, all of the radiators in the house were on and upstairs heated up to 23 degrees as well as downstairs. Any suggestions on what might be happening please?

How do i get in contact with you for hire to install the Nest ?

Can this work with OpenTherm compatible Combi?

What size cable are you using ?

Hello my smart is show yellow drop want that mean ???

Can I just wire both heating zones in to one nest?

If you have 2 zones on a Y-Plan is one Nest compatible?

You say you don't need to wire the earth next to T1/T2 because these are class II appliances, but that is not what the installation instructions say.

not being able to use open therm on 2 zones really does suck..

All fine....BUT.....While all this is all correct and proper the fact that Opentherm cannot be used is an important issue that needs to be addressed properly. The presenter is clearly aware of the problem and immediately goes to the hard contacts. However, this means that the benefits of Opentherm cannot be realised and that the system is bound to be of low efficiency by design. Not his fault because it's a flawed interface. What we really need to minimise the likelihood of multiple OT connetions calling for different water temperatures is a link box that design that can allow daisy-chaing of the boxes so that the last box calls for the highest temperature from the set of boxes. It's not rocket science but are there any manufacturers producing such devices? Apparently not. So, we're left to use inefficient systems because of a lazy supplier industry possibly also hampered by the need to train plumbers on a newer approach to their job. They won't like that, will they?

So there is no way to have both thermostats control the domestic hot water in an S plan +?