Google Nest · Thermostats

Google Nest Learning Thermostat (3rd gen) Installation in London

Updated 1 November 2026

The UK and Ireland version of the 3rd gen Nest Learning Thermostat comes in two parts: a round display, and a mains-powered Heat Link that does the switching. Google's UK store lists it as out of stock (checked 1 November 2026), so this page is for owners and for units bought elsewhere. A vetted JACK pro in London fits the Heat Link where your old programmer was, on the wiring already there, and gives you a fixed price in the JACK app before you book.

In short

Yes. A vetted JACK pro in London wires the 3rd gen Heat Link where your programmer or receiver used to be, on the 230 V wiring and fused supply already there, then puts the display on the wall or on a Nest Stand. Google says the UK version should be installed by a professional. JACK treats anything wired at the boiler itself, OpenTherm included, as a job for a Gas Safe engineer.

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Nest Learning Thermostat (3rd gen): key facts

UK and Ireland version: Thermostat model A0001 with Heat Link model A0003 Source: Google: 3rd gen Nest Learning Thermostat installation guide, UK and Ireland (PDF)
Google Store UK: Listed as out of stock, with a 'get notified' button, when checked on 1 November 2026 Source: Google Store UK: Nest Learning Thermostat (3rd gen)
Who Google says should fit it: 'Should be installed by a professional'; the UK guide also carries a high-voltage warning Source: Google: 3rd gen Nest Learning Thermostat installation guide, UK and Ireland (PDF)
Heat Link supply: 230 V AC, 50 Hz to L and N; every wiring diagram in the guide shows a 3 A fuse on that supply Source: Google: 3rd gen Nest Learning Thermostat installation guide, UK and Ireland (PDF)
Heat Link terminals: Heating relay on 1, 2 and 3; hot water relay on 4, 5 and 6, each 3 A resistive, 1 A inductive; OpenTherm on OT1 and OT2, 42 V DC max Source: Google: 3rd gen Nest Learning Thermostat installation guide, UK and Ireland (PDF)
Display power: On the wall, 12 V DC at 0.15 A from the Heat Link's T1 and T2; on the Nest Stand, a plug-in adapter giving 5 V DC, 1.4 A Source: Google: 3rd gen Nest Learning Thermostat installation guide, UK and Ireland (PDF)
Spacing: Heat Link with at least 30 cm of space either side; thermostat no more than 30 m from it Source: Google: 3rd gen Nest Learning Thermostat installation guide, UK and Ireland (PDF)
Systems on Google's UK spec page: Combis; system and heat-only boilers; domestic hot water tanks; wet (hydronic) underfloor; air- and ground-source heat pumps for heating only; zoned systems with a thermostat per zone; OpenTherm Source: Google Store UK: Nest Learning Thermostat (3rd gen) tech specs
Not compatible: High-current systems such as electric radiators or electric underfloor heating, and proprietary bus systems without the maker's converter Source: Google Home Help: Nest thermostat compatibility in Europe

Device facts come from Google Nest Help (UK), the Google Store UK and Google's UK installation guide, linked beside each fact. Several Nest models are out of stock or no longer sold in the UK, so these pages are written for the device you already own: check its name on the box, in the app or on its base, and send it with your request. Last checked 1 November 2026.

How the Nest Learning Thermostat (3rd gen) is powered and mounted

The Heat Link is the wired half of this thermostat. It takes a 230 V supply and switches the boiler, and on a home with a cylinder the hot water too, through its two relays. Google's guide says to fit it first, near the boiler or a junction box, and warns that connecting the display straight to the heating would destroy it with mains voltage. The Heat Link is needed even where the old controls ran at low voltage.

The round display goes on the wall or on a shelf. On the wall it takes 12 V from the Heat Link's T1 and T2 terminals, usually over the two cores that fed your old room thermostat, and talks to the Heat Link by wire and by Thread radio. On the Nest Stand, sold separately, it runs from a plug-in adapter and relies on radio alone, so the pro checks that thick walls between the stand and the Heat Link do not weaken the link.

The diagrams in Google's UK guide cover six set-ups: combis switched at 230 V or by dry contacts, S-plan and Y-plan cylinder systems, OpenTherm boilers and district heating. It lets the Heat Link take its live and neutral from 'the L and N circuit on the boiler or junction box'. A JACK pro uses the junction box, wiring centre or the old programmer's position, never the boiler's own terminal strip.

What the pro checks first

The boiler label: an On/Off or OpenTherm boiler, and not an electric or high-current heating system
Where the programmer, room thermostat and any zone valves connect: at the wall, in a wiring centre, or only inside the boiler
Whether the hot water cylinder is vented or unvented, because controls on an unvented cylinder need a G3-qualified installer
A fused supply near the programmer's position, which Google's diagrams protect with a 3 A fuse
How many cores reach the old room thermostat, to power the display from T1 and T2 or to move it to a stand

What the pro does on the Nest Learning Thermostat (3rd gen)

Heating controls isolated and proved dead before the programmer comes off the wall
Heat Link fixed with 30 cm clear each side, heating on terminals 1, 2 and 3 and, where there is a cylinder, hot water on 4, 5 and 6
Old room thermostat disconnected at the wall or wiring centre, never inside the boiler
Display base on an inside wall at Google's 1.2 to 1.5 m, clear of radiators and draughts, or the Nest Stand set up on a shelf
Boiler interlock proved: the boiler fires when the thermostat calls for heat and stops when it is satisfied
Heating and hot water schedules set in the app; for the 230 V work, ask your pro for a Minor Electrical Installation Works Certificate

How the Nest Learning Thermostat (3rd gen) installation goes

1Your photos of the boiler, programmer and room thermostat checked before the visit, so any Gas Safe part is clear up front
2Power isolated at the fused spur and the old programmer or receiver taken off
3Heat Link mounted and wired: live and neutral first, then the heating and hot water relays
4Display fitted on its base on the T1 and T2 wires, or placed on the stand and plugged in
5Thermostat paired with the Heat Link, joined to your Wi-Fi and added to your account
6Heating and hot water switched on and off from the display and the app before the pro leaves

Before you book: what to send

A photo of the boiler's data label, and one of the underside where its cables come out
Photos of your current programmer and room thermostat
A photo of your cylinder showing its label, if you have one, or a note that the boiler is a combi
Whether you have the Nest Stand, and which room the display should live in
If you rent or the building is listed, the consent you have: Google's own UK installation terms leave getting consents to the customer

Where does the JACK pro's work stop on a 3rd gen Nest?

At the boiler. The parts of a 3rd gen job split like this:

At the wall or wiring centre: the Heat Link in place of a programmer, timer or receiver on the existing wiring, which is neither gas work nor notifiable electrical work
On a vented cylinder: S-plan or Y-plan wiring-centre changes so the Heat Link's hot water relay drives the zone valve
At the boiler: any connection to its own terminals, including OpenTherm, or a change between OpenTherm and relay control, which JACK treats as a job for a Gas Safe engineer
On an unvented cylinder: anything touching its controls, for a G3-qualified installer
A new circuit from the consumer unit: a registered electrician, not a JACK booking

Why the line sits there: the HSE's code of practice for the gas regulations, L56, treats swapping electric thermostats and timers as outside gas work, while Gas Safe Register says a boiler case held on by several screws is normally a functional case that nobody who is not Gas Safe registered should remove. JACK makes no claim that its pros hold Gas Safe registration.

Who can install a Nest thermostat: Gas Safe engineer or electrician?

How is Google Nest installation priced in London?

A vetted pro prices your Nest job from the model and your photos, and the JACK app shows that fixed price before you book.

Full pricing guide for Google Nest installation

Frequently asked questions

Is the Nest Learning Thermostat (3rd gen) still supported?

Yes. Google's end-of-support notice, which took effect on 25 October 2025, covers the 1st and 2nd gen Learning Thermostats, including the 2014 Europe version, but not the 3rd gen. When Google said in April 2025 that it would launch no new Nest thermostats in Europe, it kept the 3rd gen and the Thermostat E on app control and security updates, according to 9to5Google's report.

Can the 3rd gen Nest control a hot water cylinder?

Yes, on a system or regular boiler with a separate tank: the Heat Link's second relay switches the hot water on its own schedule, which Google sets by default to 06:00–08:00 and 16:00–22:00. It cannot control an electric hot water tank. If your cylinder is unvented, its controls are a job for a G3-qualified installer, not a JACK booking.

Can the 3rd gen display sit on a shelf instead of the wall?

Yes, on the Nest Stand, which Google sells separately. Google's guide puts the stand 0.75–1 m high on a table or shelf, powered by a plug-in adapter. It then reaches the Heat Link by radio only, so the stand works best in the room you use most, without several walls in the way.

How much does Google Nest Learning Thermostat (3rd gen) installation cost in London?

It is a fixed price for your Nest Learning Thermostat (3rd gen), worked out by a vetted pro from the model, a photo of where it is going and what power is there now, and shown in the JACK app before you book. Other devices can go on the same booking for one price. If you would rather pay for time, hourly hire for smart home is typically £45–£95 per hour as a guide.

Often booked together

Nest Heat Link installation

A failed or badly placed 3rd gen Heat Link swapped or moved on its own wiring; faults inside the boiler go to a Gas Safe engineer.

Nest Thermostat E installation

The Heat Link E swapped in for your wired room thermostat on two of its wires, and the display set on its stand where it reads the room.

More Google Nest thermostats

Google Nest thermostat installation

The Nest Learning Thermostat (3rd gen) and the Nest Thermostat E, with their Heat Links fitted on the wiring you already have.

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Sources

The device facts and rules on this page come from these pages, checked on 1 November 2026.

Jack All Trades (JACK) is an independent London service for booking vetted local pros. It is not part of, affiliated with or endorsed by Google LLC, and it is not part of Google's Nest Pro programme. Google Nest product names are used only to describe the devices JACK pros install; prices are set by JACK pros, not by Google, and JACK does not sell Nest devices. JACK pros do not open boilers or claim Gas Safe registration.

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