Warmup 6iE Thermostat Review: Features, Installation and Verdict

Quick answer: The Warmup 6iE is a well-designed smart thermostat for electric and hydronic underfloor heating, with a touchscreen, floor sensing, app control and adaptive heating. Its biggest appeal is easy day-to-day control. The catch is that it needs correct wiring, a permanent 230V supply and sensible setup, so it isn't a casual DIY plug-and-play device.

At a glance

Warmup describes the 6iE as a touchscreen controller for underfloor heating. It is designed for a single heating zone, with one thermostat controlling the room or area connected to it. If your property has several rooms, you will normally need one 6iE per zone, or a broader control system that can manage more zones. Our guide to underfloor heating zoning explains how those zones are normally planned.

What the Warmup 6iE does well

The 6iE is more than a digital replacement for a rotary thermostat. It gives you a clear touchscreen, remote control through the MyHeating app and several tools that suit the slower response of an underfloor heating system.

That last point matters. Underfloor heating doesn't behave like a small panel heater. The floor and screed can continue releasing heat after the boiler or electric mat has switched off. A basic on-and-off control can therefore leave the room too warm or start heating too late. The 6iE's adaptive functions are intended to account for that lag.

A touchscreen you can use without hunting for buttons

The 3.5-inch screen is a clear step up from a conventional digital thermostat. You can scroll and swipe through temperatures, modes and settings rather than pressing small buttons or turning a dial.

The display can be personalised with different backgrounds, and Warmup offers light, dark and random options in the product documentation. You can also choose whether the screen shows the temperature, the time, or a more minimal standby display. These are small details, but they matter when a thermostat sits on a visible wall.

The screen is not a substitute for good commissioning. Make sure the installer has set the correct system type, load, flooring details and sensor configuration.

Floor sensing protects the floor as well as the room

The 6iE includes an air sensor and a floor sensor. The air sensor measures room temperature, while the floor probe measures the surface temperature. Warmup's documentation lists an NTC10K sensor supplied as a 3m probe, extendable to 50m.

Using both sensors gives you more control than an air-only thermostat. A floor sensor can provide an overheat limit when the floor finish has a maximum temperature requirement. This is worth considering for timber, laminate, vinyl and other flooring with a specified surface-temperature limit.

Smart control through the MyHeating app

Setup starts by scanning the QR code shown on the 6iE with the Warmup MyHeating app. The app guides you through the location, room, system type, heating power and flooring questions. It then connects the thermostat to your Wi-Fi network.

That process is straightforward when the thermostat has a stable connection. The manual advises installing the 6iE where the distance from the router is not excessive, as this helps avoid wireless connection problems. You should also avoid placing it beside a window or door, in direct sunlight or above another heat source such as a radiator or television. The position affects both the air reading and the quality of the control decisions.

The app also provides energy and cost graphs, subject to entering the correct information for your system. The energy monitor calculates usage from system power, efficiency and run time. That means the figures are only as accurate as the setup information. If you are unsure of the heater wattage, system type or any relay arrangement, ask the installer or system manufacturer.

Adaptive start and weather-based early start

Adaptive learning uses historic heating and cooling behaviour, previous external temperatures and the forecast to work out when the heating should begin. It is designed to reach the scheduled comfort temperature at the right time rather than switching on at a fixed hour and hoping the floor catches up.

This is a sensible feature for UFH, but it needs time to learn. Give it a normal routine and a few heating cycles before judging the results. It also works in Program Mode according to the manual, so don't expect it to behave as if it has fully learned your home while you are using manual override mode.

Weather-based early start is another useful option. The thermostat can take local weather conditions into account when deciding when to begin heating. A warm sunny day may not need the same start time as a cold one.

SmartGeo and open-window detection

SmartGeo is Warmup's location-based automation. When enabled through MyHeating, it can learn routines and use smartphone location to reduce heating when you are away and bring it back up in time for your return. It is turned off by default, so you need to opt in if you want the feature.

Think of SmartGeo as a convenience, not a guarantee. Location permissions, phone battery settings, Wi-Fi coverage and the way your household actually uses the house all affect whether it behaves as intended. Test it while you are at home and keep a sensible schedule in place as a fallback.

Open-window detection is more straightforward. The thermostat can switch heating off when it detects a window or door has opened and outside air is significantly cooler than inside. This is useful in a draughty room, although detection cannot know whether an open window was deliberate. You may need to turn heating back on manually after closing it.

Compatibility: will the 6iE fit your system?

The 6iE can control electric and hydronic underfloor heating. The technical documentation lists compatibility with electric and hydronic systems up to 16A, along with combi and system boilers that provide a switched live 230V AC input.

That doesn't mean every arrangement will work without help. The 6iE needs a permanent 230V AC supply at all times. For lower-voltage or volt-free systems, Warmup says a contactor must be used. An electric system above 10A also needs suitable conductor sizing, while the overall load must not exceed the thermostat's 16A rating.

For hydronic systems, the 6iE can operate the relevant heating call, but the boiler, manifold, pump, actuators and wiring still need to be designed and commissioned as one system. The thermostat is the controller, not the whole heating installation.

A qualified electrician should install the 6iE in accordance with the current edition of the BS 7671 Wiring Regulations. Warmup's manual calls for a permanent supply from a 30mA RCD or RCBO-protected circuit and a 50mm back box. These are installation requirements, not optional preferences.

Installation and commissioning

The physical installation is relatively compact, but the electrical work is not a beginner job. The supplied documentation gives a clear sequence:

1. Isolate the mains supply.
2. Install the back box in a suitable location.
3. Route the heater, supply and sensor wires through the box.
4. Connect the wires according to the wiring diagram and system type.
5. Fit and secure the power base.
6. Restore power and complete the on-screen setup.
7. Scan the QR code with MyHeating and configure the location and room.

The setup asks for the type of heating system, the flooring type and the system's power in watts. These answers affect later control and energy monitoring, so they should come from the installation design. If an external relay or contactor is fitted, the manual specifically instructs the user to set the system type as Electric + Relay.

The manual also gives a resistance check for the floor sensor. Between 20°C and 30°C, the stated resistance range is 8kΩ to 12kΩ. If the sensor reports an error, don't simply disable floor sensing and carry on. Have the wiring and probe checked by a competent person.

What are the drawbacks?

The 6iE is a premium controller, but it is not the right choice for every project.

It needs professional electrical installation. The 6iE must be installed by a qualified electrician according to the manufacturer's instructions and the current wiring regulations. The permanent supply, protective device, conductor sizing and heater load all need checking.

It is primarily a single-zone controller. One 6iE controls one registered room or heating zone. A property with several rooms may need one unit in each zone. You should read the smart thermostat guide before choosing a wider system.

The advanced features need a sensible setup. SmartGeo depends on location data, adaptive start needs useful history, and energy monitoring depends on correct system information. None of those features can rescue incorrect commissioning.

The floor sensor needs the right position. A floor probe installed in an unsuitable location can give a misleading reading. The installer should place it as directed by the system design, away from the heating element where appropriate, and configure the sensor correctly.

App connectivity isn't the same as local control. The thermostat has its own controls, but a homeowner who wants to use the app needs a suitable Wi-Fi connection and a smartphone with the MyHeating app. If the network fails, check the local thermostat rather than assuming the whole system has failed.

Who should buy the Warmup 6iE?

I'd choose the 6iE when you have a properly designed underfloor heating zone, you want floor and air sensing, and you value clear local controls alongside app access. It suits both electric UFH in a bathroom, kitchen or similar space and hydronic UFH where the heating circuit has been designed for room-by-room control.

It is particularly sensible for people who don't want to fiddle with a conventional programmable thermostat. The screen is easy to read, the setup is guided, and the scheduling options cover everyday use. Add weather-based early start and adaptive learning and you have controls that are better matched to the way a floor warms and cools.

I wouldn't choose it as an all-in-one control solution for a large property with many zones. For that, compare a multi-zone controller and work with an installer who can map the circuits, schedules and floor sensor requirements. The underfloor heating brand guide is a useful starting point for comparing wider systems.

Final verdict

The Warmup 6iE is one of the more user-friendly smart thermostats for UK underfloor heating. It combines a touchscreen, air and floor sensors, Wi-Fi app control, adaptive start, weather-based early start and optional location automation in a compact unit.

Its strengths are clear controls, sensible UFH features and support for both electric and hydronic systems. Its limitations are equally important: professional installation, permanent 230V power, correct floor sensor commissioning and a separate thermostat for each zone.

For a single well-designed zone, the 6iE is a strong choice. Install it properly, enter accurate system details and use the advanced features to suit your household rather than switching everything on and leaving it alone. That is how you get useful control from a thermostat designed for slow, steady underfloor heating.

Source notes

This review uses Warmup's official product, technical and setup information:

• Warmup 6iE Smart WiFi Thermostat product page
• Warmup 6iE Smart WiFi Thermostat overview
• 6iE technical specification
• 6iE Wi-Fi setup guidance