32
neo devices per neoHub G3
6 yrs
neoFlo battery life
8
heating zones per wiring centre
16A
max switching for electric heat
One system, every type of heating — if you pick the right control
Heatmiser (now IMI Heatmiser) makes one of the most flexible smart heating ranges in the UK. The catch is that the range is wide on purpose: there is a different control for wet underfloor heating, electric underfloor heating, boilers, radiators and hot water. Choose the wrong one and it either won’t switch the load safely or won’t read the floor temperature correctly.
This guide walks through the whole neo ecosystem in plain English, shows you which model suits your system, and explains the parts people most often get stuck on — the new neoFlo smart radiator head, the RF Switch (including the 16A version), the neoStat Pro, and the UH-series wiring centres. If you only read one section, jump to “Which Heatmiser do I need?” below.
“The heat source provides warm water, the thermostat controls the room, the neoHub adds the app, and the RF Switch lets a room call for heat.” — the neo system in one sentence.
Quick note on the name
Heatmiser is now IMI Heatmiser — same products, new badge
In 2025 Heatmiser became part of IMI, a global heating and cooling engineering group, sitting within IMI’s new Climate Control sector alongside brands such as IMI TA and IMI Heimeier. In practice very little changes for buyers: the Heatmiser product brand, the neo system, warranties and the people behind it all stay the same. You’ll simply see a refreshed logo and updated packaging rolling out gradually, with transition labels on some best-sellers so they’re still easy to recognise on the shelf. If you see “Heatmiser” and “IMI Heatmiser” used interchangeably, they mean the same thing.
Which Heatmiser do I need?
Start with the type of heating you actually have in the room. That single question decides almost everything, because the controls differ in how much current they switch and whether they read a floor sensor.
Water underfloor heating (off a boiler or heat pump)
Pipes in the floor fed from a manifold. Each room needs a thermostat that opens its zone’s actuators through a wiring centre.
Pick: neoStat (wired) or neoAir v3 (wireless), plus a UH-series wiring centre.
Electric underfloor heating mats or cable
Heating element under tile/stone, switched directly by the thermostat and protected by a floor sensor.
Pick: neoStat-e (switches up to 16A, floor probe included) or neoStat Touch-e.
A combi or system boiler with radiators
One central thermostat tells the boiler when to fire. Add per-radiator control if you want room-by-room comfort.
Pick: neoStat wired to the boiler, or neoAir v3 + RF Switch for wireless. Add neoFlo on radiators.
Smarten up a single radiator without rewiring
You want app control or a schedule on one or two radiators, with no cabling and minimal disruption.
Pick: neoFlo smart radiator head — add a neoHub G3 for app control.
Time your hot water cylinder
Programming a stored hot-water cylinder, often alongside a heating zone.
Pick: neoStat-hw hot water programmer (changeover contacts for powered valves).
Heat pump that also offers comfort cooling
Air/ground source systems that can run in reverse for gentle summer cooling, where condensation control matters.
Pick: neoStat Pro (humidity + dew-point aware, floor & air sensing).
How the neo system fits together
Almost every Heatmiser smart product is part of one family called neo. Understanding the four building blocks makes the whole range easy to navigate.
The thermostat
A neoStat, neoAir or neoFlo measures the room and decides when heat is needed. Each one works on its own with local schedules.
The neoHub G3
Plugs into your router by Ethernet and connects up to 32 devices to the free neoApp for remote access, scheduling and smart-home control.
The app & smart home
Control from anywhere on iOS or Android, with Apple Home, Amazon Alexa, Google Home and (now) Samsung SmartThings support via the hub.
The RF Switch
A wireless receiver that lets a wireless thermostat or neoFlo actually call for heat — switching the boiler, a zone valve or an electric load.
The key distinction
Wired vs wireless control
Mains-powered neoStat models are permanent installations and conveniently repeat the wireless signal for other neo devices, building a reliable mesh across the home. Battery-powered neoAir v3 and neoFlo are perfect for retrofits and extensions where running thermostat cable isn’t practical. Mix and match freely — up to 32 devices on a single neoHub G3.
New: the neoFlo smart radiator thermostat
neoFlo is Heatmiser’s smart thermostatic radiator valve (TRV) head — the easiest way to bring room-by-room control to radiator-heated rooms, and the natural way to extend an existing neo underfloor heating system upstairs into radiator rooms.
neoFlo — smart thermostatic radiator control by IMI Heatmiser. Tap to play.
- Up to 6 years battery Hybrid technology runs on 4×AA cells, so there’s no wiring and little maintenance.
- Quiet, digital precision A digital motor replaces a manual TRV head for accurate, low-noise everyday control.
- Works on its own Manual mode, simple scheduling, boost, frost protection, open-window detection and monthly valve protection are all built in.
- neoApp ready Add a neoHub G3 for app control, holiday mode, pre-heat, temperature hold and software updates.
- Hybrid-friendly Extend neo control from underfloor heating into radiator rooms on the same system.
- Fits most valves M30 × 1.5 connection with an RA adaptor supplied; more adaptors available for older valves.
Three levels of control
neoFlo on its own
Local radiator control from the moment it’s fitted — manual setpoint, four daily heating periods, boost and frost protection. No network needed.
Add neoHub G3
Unlocks the neoApp, remote access, smarter scheduling, pre-heat, ±5K offset and over-the-air updates across the neo ecosystem.
Add an RF Switch
Lets neoFlo call for heat. Up to 20 neoFlo heads pair to one RF Switch (10 per channel) to trigger the boiler when rooms need warmth.
Choose a pack
Buy a single head, a four-pack for several rooms, or a Smart/Heating pack that bundles the neoHub G3 (and RF Switch) to get going faster.
Models for electric underfloor heating
Electric floor heating draws real current and needs a floor sensor to protect the floor finish, so it uses dedicated “-e” controls rather than the standard neoStat.
neoStat-e (V3)
The dedicated electric floor-heating thermostat. Switches up to 16A, ships with a 3 m floor probe, and can run as a thermostat or a timer (handy for towel rails). 7-day programming with four levels a day.
Best for: tiled bathrooms, kitchens and wet rooms on electric mats.
neoStat Touch-e
A touchscreen take on the electric model. Controls a zone of electric underfloor heating, an electric towel rail or electric radiators with the same 16A capability and floor sensing.
Best for: a premium glass-fronted look in living spaces.
Slimline-e (V3)
A slimline electric thermostat for the same job in a lower-profile housing, available in wired and RF versions for the neo system.
Best for: minimalist installs and shallow back-boxes.
What NOT to use
Don’t try to run electric UFH from a standard neoStat, a neoStat Pro, or an RF Switch 16A on its own — none provide the floor-limit sensing the “-e” models give you.
The rule: electric floor heating → an “-e” thermostat.
Models for water (wet) underfloor heating
Wet UFH is zoned at the manifold. Each room’s thermostat sends a call for heat to a central wiring centre, which powers that zone’s actuators and brings on the pump and boiler. The thermostat itself switches almost no current — the wiring centre does the work.
neoStat (V3)
The mains-powered programmable room thermostat that’s the backbone of most wet UFH systems. One per zone, wired back to a UH-series wiring centre, and it repeats the neo signal for the rest of the home.
Best for: new builds and full multi-zone systems.
neoAir v3
Battery-powered wireless thermostat that pairs to a UH8-RF v2 wiring centre. Configurable as thermostat, timer or both, with self-learning pre-heat. No thermostat cabling required.
Best for: retrofits, extensions and awkward walls.
neoStat Pro
A minimalist, flush-mounted thermostat with floor and air sensing plus a humidity sensor — ideal for heat-pump-fed wet UFH that also offers comfort cooling. (More on this below.)
Best for: high-spec, well-insulated homes on heat pumps.
Wiring centre + actuators
A UH4/UH6/UH8 (wired) or UH8-RF v2 (wireless) wiring centre sits above the manifold, with 230V thermal actuators on each loop. Up to six actuators per zone.
Best for: organising the whole manifold from one point.
Models for boilers & radiators
If your home runs on a combi or system boiler with radiators, you have two clean routes — a single wired thermostat at the boiler, or wireless control through an RF Switch — plus the option to add per-radiator smarts with neoFlo.
neoStat (V3)
Wire it to the boiler’s switched-live and it becomes a smart programmable room thermostat. Add a neoHub G3 for app control. Compatible with most boiler technologies.
Best for: a straightforward single-zone boiler upgrade.
neoAir v3 + RF Switch
The neoAir talks wirelessly to an RF Switch wired at the boiler. The RF Switch’s volt-free output controls the boiler — no cable run between thermostat and boiler.
Best for: retrofits where you can’t cable the thermostat.
neoFlo on each radiator
Add smart heads to individual radiators for true room-by-room scheduling. With a neoHub G3 you get app control; add an RF Switch so rooms can call the boiler for heat.
Best for: layering room control onto an existing system.
neoStat-hw
A dedicated hot-water programmer with changeover contacts for motorised valves that need power to open and power to close — pair it with a heating zone for full S-plan/Y-plan control.
Best for: timing a stored hot-water cylinder.
The RF Switch explained — and when you need the 16A version
“The Switch” trips a lot of people up because there are two different products with similar names. They do related jobs but are not interchangeable.
RF Switch (v2) — for boilers & valves
A surface-mounted, 2-channel wireless receiver providing 2 heating zones and 1 hot water zone with a volt-free boiler output. It’s the bridge that lets a wireless neoAir — or up to 20 neoFlo heads — call for heat, and it can act as a wireless boiler link from a UH8-RF v2.
Use it to: switch a boiler or a zone valve (low-current, volt-free).
RF Switch 16A — for electric heaters
A wireless receiver that can switch a heavier electric load — up to 16A. It’s designed to power things like infrared panels, electric radiators and other direct electric heaters wirelessly from a neoAir v3 or Slimline-RF v3.
Use it to: switch a mains electric heater that draws real current.
When to choose the 16A
Quick decision
Reach for the 16A RF Switch only when you’re switching a mains electric heating load directly (panel heaters, electric radiators, infrared) and want to do it wirelessly. For a boiler or a powered zone valve, the standard RF Switch v2 with its volt-free contacts is the right (and safer) choice. And note — the 16A switch is not suitable for electric underfloor heating, because it has no floor-sensor function. For electric UFH, use the neoStat-e instead.
Spotlight: neoStat Pro
The neoStat Pro introduces Heatmiser’s newest design language — a slim, flush-mounted control with a soft-glow, dimmable show-through display and touch-sensitive keys in a matt-white finish.
Air, floor & humidity
Built-in air sensor plus connections for remote air and floor probes (floor sensor included), and a built-in humidity sensor for cooling control.
Heat-pump reverse cooling
With air/ground source systems it can run gentle comfort cooling, calculating the dew point and pausing to prevent condensation. (Cooling activates via a planned app update.)
Mesh networking + optimum start
Always-on mesh links between neo devices, energy-saving optimum start, holiday and hold functions, and full neoApp control via the neoHub.
Solar, heat pump & most boilers
230V, 3A max switching, ±1°C accuracy and an 85×85×12 mm flush profile. Remember: not for electric underfloor heating.
Heatmiser wiring centres (UH-series)
A wiring centre is the hub of a wet underfloor heating system. It mounts on a DIN rail above the manifold and wires the actuators, pump, valve and boiler from a single point, with LED indication for each zone so installers can test the system at a glance. Pick the centre that matches your thermostat type and zone count.
UH4 — 4 zones, mains thermostats
Central switching for up to four zones plus outputs for the cylinder, boiler and pump. Zone 4 can be switched to a conventional radiator zone.
UH6 — 6 zones, 230V thermostats
Six-zone centre with pump-delay and creepage functions; up to four actuators per zone. Designed to sit right next to the manifold.
UH8 — 8 zones, mains thermostats
Eight-zone central switching with boiler and pump outputs and up to six actuators per zone. Zone 8 can be set as a radiator zone.
UH8-N — 8 zones, 12V thermostats
The eight-zone centre for Heatmiser’s 12V thermostats, with a hot-water output and an option to turn zone 8 into a radiator zone.
UH8-RF v2 — 8 zones, wireless
The wireless centre for neoAir v3, Slimline-RF v3 and Touch-RF. Configure UFH vs radiator per zone, and pair an RF Switch v2 for a wireless boiler link.
Match it to your thermostats
12V thermostats → UH8-N. 230V/mains thermostats → UH4/UH6/UH8. Wireless thermostats → UH8-RF v2. Then size by zone count.
Wiring centre specifications
| Feature | UH8-N | UH4 | UH6 | UH8 | UH8-RF v2 |
|---|---|---|---|---|---|
| Thermostat type | 12V | 230V mains | 230V mains | 230V mains | Wireless |
| Heating zones | 8 | 4 | 6 | 8 | 8 |
| Hot water zone | 1 | 1 | 1 | — | 1 |
| RF Switch v2 compatible | No | No | No | No | Yes |
| DIN rail mounting | Yes | Yes | Yes | Yes | Yes |
| Relay load max | 3A | 3A | 3A | 3A | 3A |
| Total load | 5A | 5A | 5A | 5A | 5A |
| Supply | 230V AC | 230V AC | 230V AC | 230V AC | 230V AC |
| Dimensions (mm) | 384×148×60 | 384×148×60 | 384×148×60 | 384×148×60 | 384×148×60 |
At a glance: which control for which system
| Your system | Recommended control | Also needs | Switches |
|---|---|---|---|
| Water UFH (wired) | neoStat (V3) | UH4/UH6/UH8 + actuators | Via wiring centre |
| Water UFH (wireless) | neoAir v3 | UH8-RF v2 + actuators | Via wiring centre |
| Electric UFH | neoStat-e / Touch-e | Floor probe (included) | Up to 16A |
| Boiler + radiators (wired) | neoStat (V3) | neoHub G3 for app | Boiler switched-live |
| Boiler + radiators (wireless) | neoAir v3 | RF Switch v2 | Volt-free boiler |
| Single radiator / retrofit | neoFlo | neoHub G3 for app | Radiator valve |
| Direct electric heater | neoAir v3 / Slimline-RF | RF Switch 16A | Up to 16A |
| Hot water cylinder | neoStat-hw | — | Powered valve |
| Heat pump + cooling | neoStat Pro | neoHub G3 | 3A, volt-free |
Featured Heatmiser products
IMI Heatmiser
neoFlo Smart Radiator Thermostat
Wireless smart TRV head for the neo system. Up to 6-year battery, quiet digital control, and full neoApp control when paired with a neoHub G3.
£97.00 inc. VAT
IMI Heatmiser
neoHub G3 Smart Gateway
The brain of the neo system. Connects up to 32 devices to the neoApp by Ethernet, with NFC pairing and per-zone energy history. Required for neoFlo app control.
£130.00 inc. VAT
IMI Heatmiser
neoStat Pro Smart Thermostat
Slim, flush-mounted thermostat with air, floor and humidity sensing. Built for heat-pump wet systems with comfort cooling. Not for electric UFH.
£107.00 inc. VAT
IMI Heatmiser
neoStat-e Electric Thermostat (V3)
The dedicated electric underfloor heating thermostat. Switches up to 16A and ships with a 3 m floor probe. Runs as a thermostat or a timer.
£64.99 inc. VAT
IMI Heatmiser
neoStat Programmable Thermostat (V3)
The wired workhorse for wet underfloor heating zones and boiler control. Acts as a signal repeater for the rest of your neo devices.
£59.00 inc. VAT
IMI Heatmiser
neoAir v3 Wireless Smart Thermostat
Battery-powered wireless control for retrofits. Pairs with the RF Switch or UH8-RF v2. Works as thermostat, timer or both, with self-learning pre-heat.
£57.70 inc. VAT
Works with your smart home
Add a neoHub G3 and the neo system slots into the platforms you already use, so you can fold heating into routines and voice control.
- Apple Home
- Amazon Alexa
- Google Home
- Samsung SmartThings
- IFTTT
- neoApp (iOS & Android)
Still not sure which to choose?
Tell us your heating type and we’ll point you to the right control. It also helps to browse by category:
• All Heatmiser controls
• Smart & programmable thermostats
• Wiring centres, RF switches & components
• Heat-pump compatible controls
Build your smart heating system the right way
From the new neoFlo radiator head to complete underfloor heating control, the full Heatmiser range is in stock at Quality Heating with fast UK delivery and expert advice.
Shop all Heatmiser Discover neoFlo