Controlling Underfloor and Zone Heating Smartly: What Works in the UK

Our main smart thermostat guide covers the big names, but it’s worth flagging a gap: mainstream smart thermostats are largely designed around a single boiler and a single heating zone, which doesn’t map cleanly onto underfloor heating (UFH) or a house split into several independently-controlled zones. UFH in particular responds much more slowly than a radiator - the floor’s thermal mass means it takes longer to heat up and longer to cool down - so it needs a controller built with that in mind, not a radiator thermostat bolted on regardless.

Wet UFH vs Electric UFH

These need different control approaches:

• Wet (water-based) UFH - pipes run from the boiler through manifolds to each zone; control is usually via actuators on the manifold plus a room thermostat/stat per zone
• Electric UFH - heating mats or cables wired directly, typically controlled by an in-wall thermostat per room, closer to a standard heating control but still needs to account for slow floor response

TPI Control: Why UFH Thermostats Behave Differently

Worth understanding what’s actually happening inside a genuinely UFH-suited thermostat, since it’s a meaningfully different control approach from a simple on/off radiator stat. Most quality UFH thermostats use TPI (Time Proportional and Integral) control rather than a basic thermostat’s on/off switching: instead of running full-on until the target temperature is hit and then cutting off completely (which, given UFH’s thermal lag, causes noticeable temperature overshoot and undershoot as the floor keeps radiating heat well after the call for heat stops), TPI cycles the heat on and off in short, calculated bursts that get shorter as the room approaches target temperature - actively working with the floor’s thermal mass rather than fighting it. This is the actual mechanism behind why a purpose-built UFH thermostat (Warmup, Heatmiser) feels smoother in practice than a basic radiator thermostat pressed into UFH service, and it’s worth specifically checking a product mentions TPI (or equivalent proportional control) rather than assuming any “smart” UFH thermostat has it.

Floor Sensors and Maximum Floor Temperature Limits

A genuinely important, easy-to-overlook detail: what floor covering sits on top of your UFH determines a maximum safe floor temperature, and a good UFH thermostat needs a floor probe sensor (not just an air sensor) to actually enforce it. Tile and stone tolerate higher floor temperatures comfortably (often up to 27-29°C). Engineered wood and laminate flooring manufacturers typically specify a lower maximum (commonly around 27°C, sometimes lower) to avoid warping, drying out, or voiding the flooring’s own warranty - and carpet with underlay adds significant thermal resistance, which both slows heat transfer into the room and means the floor itself can reach a higher temperature than expected for a given room temperature target if the thermostat isn’t accounting for it via a floor sensor. If your UFH is under wood or laminate specifically, check the thermostat you buy supports a floor sensor with a configurable maximum floor temperature limit, and set that limit according to your flooring manufacturer’s specification, not just the room’s default.

Quick Comparison

Product	UFH Type	Typical Price	Best For
Warmup 6iE / Element	Electric (and wet with add-ons)	£150-220 per room	Purpose-built UFH thermostats, UK UFH specialist brand
Wiser by Drayton	Wet, multi-zone	£200-350 for a starter multi-zone kit	Whole-house multi-zone control with UFH support
tado° with Extension Kit	Wet, up to 20 zones	£100-150 for the kit (on top of existing tado°)	Existing tado° ecosystem, room-by-room scheduling
Heatmiser neoStat	Wet and electric	£90-130 per room stat	UK-designed, popular with installers for new-build UFH

Best for Electric UFH: Warmup

Warmup is a UK underfloor heating specialist, and its smart thermostats (the 6iE and Element ranges) are built specifically around UFH’s slower response time, using floor and air sensors together to pre-heat a room accurately for a set time rather than reacting the way a radiator thermostat would. App control, scheduling per room, and energy usage reporting are all included, and because it’s a company that only does UFH, the thermostats are tuned for it rather than adapted from a general radiator product. The dual sensor approach also means it’s set up to respect the floor-covering maximum temperature limits described above, which is worth confirming is configured correctly for your specific flooring during setup.

• Pros: purpose-built for UFH specifically rather than adapted, dual floor + air sensing for more accurate pre-heating
• Cons: primarily an electric UFH specialist - wet UFH support needs additional accessories

Check Warmup Smart Thermostats on Amazon UK →Affiliate link

Best for Multi-Zone Wet Systems: Wiser by Drayton

Drayton has been making UK heating controls for decades, and Wiser is its smart multi-zone system, designed to control several heating zones - including UFH manifolds - from one app, with individual schedules and temperatures per room. It’s a strong option for a UK house with a mix of radiators in some rooms and underfloor heating in others (a common setup in kitchen extensions with UFH added to an otherwise radiator-heated house), since it handles both from the same hub.

• Pros: handles mixed radiator + UFH homes from one system, decades of UK heating control experience behind the brand
• Cons: initial multi-zone kit setup is a bigger upfront cost than a single-room thermostat

Check Wiser by Drayton on Amazon UK →Affiliate link

Best for Existing tado° Users: tado° with Extension Kit

If you’re already using tado°’s smart radiator thermostats elsewhere in the house, the Extension Kit adds support for wet underfloor heating manifolds, extending zone control up to 20 zones from the same app and same account. It’s a sensible route if you want one ecosystem covering both radiators and UFH rather than running two separate systems side by side.

• Pros: one app covering both radiators and UFH if you’re already a tado° user, scales to up to 20 zones
• Cons: only worth it if you’re already committed to the tado° ecosystem; not a great starting point on its own

Check tado° Extension Kit on Amazon UK →Affiliate link

Best for New Builds and Installers: Heatmiser neoStat

Heatmiser is a UK-designed system that’s popular with heating installers, particularly for new-build homes fitted with UFH from the start. The neoStat range covers both wet and electric UFH, integrates with a central neoHub for whole-house app control, and tends to come recommended directly by UFH installers rather than being a retrofit add-on - worth asking your installer about directly if you’re having UFH fitted rather than retrofitting smart control after the fact.

• Pros: covers both wet and electric UFH from the same range, strong installer familiarity for new-build projects
• Cons: less of a natural retrofit choice than Wiser or tado° if you’re adding smart control to an already-installed system

Check Heatmiser neoStat on Amazon UK →Affiliate link

UFH and Heat Pumps: A Naturally Good Pairing

Worth knowing if a heat pump conversion is anywhere on your radar: UFH and heat pumps suit each other unusually well compared to UFH paired with a gas boiler. Heat pumps run most efficiently at low flow temperatures, and UFH - because it heats a large surface area (the whole floor) rather than a small one (a radiator), it doesn’t need as high a flow temperature to deliver the same room heat output. Pairing the two lets a heat pump run at its most efficient operating point far more of the time than it could feeding high-temperature radiators. If you’re planning UFH as part of a wider heat pump conversion rather than retrofitting UFH control into an existing gas-heated home, this is worth factoring into the wider project, not just the thermostat choice covered here.

Before You Buy: Check Compatibility With Your Manifold/Actuators

• Wet UFH systems rely on actuators at the manifold responding to each zone’s thermostat - check any smart system you buy is compatible with your existing manifold and actuator wiring (often a job for a qualified heating engineer, not a DIY swap)
• Electric UFH thermostats usually need a compatible in-wall wiring backbox and correct cable rating for the mat/cable installed - check before buying a smart replacement for an existing in-wall stat
• Boiler compatibility matters for wet systems just as much as with radiator-only smart thermostats - combi, system and heat pump setups aren’t all supported identically across brands
• If your floor covering is wood, laminate, or carpet with underlay, confirm the thermostat has a floor sensor and configurable maximum floor temperature (see above) - this isn’t optional for those coverings, it’s a genuine warranty and safety consideration

Who Should Skip Dedicated UFH Smart Control

If you only have UFH in one small room (a bathroom, say) rather than as a whole-house or multi-zone system, a single purpose-built electric UFH thermostat (Warmup or Heatmiser at the low end of their range) is a much smaller purchase than any of the multi-zone systems here - don’t buy into a whole-house zone-control ecosystem for one room. Equally, if your UFH is under tile or stone throughout and your household doesn’t care about fine-grained per-room scheduling, a simpler non-app-connected UFH thermostat with basic TPI control may genuinely be all you need, with the smart/app layer adding cost without much day-to-day benefit.

Frequently Asked Questions

Why does my underfloor heating feel slow to respond even with a smart thermostat?

This is inherent to UFH’s thermal mass, not a fault - the floor itself acts as a heat store, so it takes longer to warm and cool than a radiator regardless of the thermostat controlling it. A UFH-specific smart thermostat helps by pre-heating ahead of when you actually need warmth and using TPI-style proportional control (see above) rather than eliminating the lag entirely.

Can I retrofit smart control onto UFH that already has a basic manual thermostat?

Usually yes, provided the existing wiring and manifold actuators are compatible with the smart system’s requirements - this is exactly the scenario a heating engineer should check before you buy, since manifold and actuator compatibility varies more than most homeowners expect.

Do I need a floor sensor, or is an air sensor enough?

If your floor covering is wood, laminate, or has a manufacturer-specified maximum temperature, a floor sensor is genuinely necessary to enforce that limit safely - an air-only sensor has no way to know the floor itself has reached an unsafe temperature for that covering. For tile or stone with no such restriction, an air sensor alone is more commonly acceptable, though dual sensing still gives more accurate, faster-settling control either way.

Is UFH worth pairing with a heat pump specifically?

Generally yes, if you’re planning both as part of the same project - UFH’s large surface area lets a heat pump run at lower, more efficient flow temperatures than feeding radiators typically allows. See the heat pump section above for more detail.

For the radiator side of a mixed system, our smart radiator valve guide and energy-saving guide cover the rest of a whole-house heating setup.