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4iE smart thermostat in white

4iE Smart WiFi Thermostat

The 4iE is a Smart heating thermostat that works with your smartphone to give you optimal, cost-effective and energy-efficient heating. For use with both electric and water underfloor heating systems, the 4iE does not require programming and uses Warmup’s latest technologies to ensure your home is always at the desired temperature, at the right time, for you.

Never come home to a cold house or overpay on your energy bills again.


Always at the right temperature

SmartGeo™ technology makes sure your home is automatically warm just as you arrive and running efficiently when you’re away.


Always on the best tariff

Download the AutoSwitch™ app for automatic tariff switching – never overpay on your energy bills again, saving you up to £210 a year.


Easy to use

The 4iE’s heating controls are easy to use and it doesn’t require programming. The set-up can be completed within a few simple steps.

4iE smart thermostat and smartphone

For Underfloor heating systems

Your Smart Underfloor Heating Thermostat

Easy to use and fully compatible with Warmup’s electric and hydronic floor heating systems, the 4iE Smart WiFi Thermostat saves you energy and money.

 An app controlled WiFi underfloor heating thermostat

The 4iE is an app-controlled WiFi heating controller that maximises the energy-efficiency of a floor heating system. Underfloor Heating systems are much more efficient in heating a home than traditional radiators by running at lower temperatures to gently reach optimal warmth. Combining underfloor heating with the 4iE allows automatic, intuitive control of heating for a truly Smart home.

 Maximises your home’s energy-efficiency

Making sure your home’s floor heating is gently warmed for when you need it and running at lower temperatures when you don’t, the 4iE and its SmartGeo technology cuts down on energy wastage, thereby reducing your energy costs too. Using the 4iE alongside Warmup’s MyHeating and AutoSwitch apps can save you up to £378 a year on your annual energy bills.

warmup 4ie smart thermostat for underfloor heating

Smarter UFH Control

 MyHeating App

The SmartGeo technology within 4iE’s partnered MyHeating app controls your heating automatically by knowing how far from home you are and warming your home in time for your arrival. This prevents energy wastage and can save you up to 25% on your energy bills.

Learn more about the MyHeating app here >


Warmup’s AutoSwitch app can save you up to £210 a year on your energy bills by searching the energy tariffs available to you on the marketplace and automatically switching you to the best value tariff for your requirements.

Learn more about the Autoswitch app here >

 IFTTT connectivity

The 4iE underfloor heating thermostat is also compatible with other Smart devices in your home through the IFTTT platform, allowing communication between the WiFi underfloor heating controller and an Amazon Alexa for instance.

View our Applets here >

4ie components with white phone

Stylish Design for Electric and Water Systems

Warmup’s 4iE Smart WiFi Thermostat for underfloor heating is designed to look great in both modern and traditionally styled homes, with glass effect front faces and bevelled chrome edges. Featuring a clear, full-colour touchscreen that can be customised with different themes and uploadable photo backgrounds.

The 4iE functions best when used in conjunction with the Warmup MyHeating and AutoSwitch heating apps for your smartphone and can be used to provide accurate control for both electric and water underfloor heating systems.

Technical Information

Technical Documentation
Technical Specifications
Dimensions (H/W/D): 90 x 110 x 18mm
Sensors Air and floor/ambient (can be extended to 50m)
Installation depth 35 mm back box
IP rating IP33
Er-P Class IV
Guarantee 3 years with Extended Lifetime Warranty available
*Upgrade for just £29.99 inc. VAT

The 4iE requires 230VAC power at all times
Compatible with electric and hydronic underfloor heating systems up to 16A
Compatible with Combi and System boilers with Switch Live (230VAC) input
For lower voltage, or volt-free systems, a contactor must be used

Get A Quote

Smart Thermostats

Warmup Smart Thermostats make heating your home effortless, using innovative technologies to learn your routines.

Quoting Tools: instant, accurate, flexible

Warmup offers an extensive range of electric and water floor systems compatible with all floor types, rooms and projects.

Electric Systems

  • ✓ Ideal for zones less than 25m²
  • ✓ Ideal for single rooms
  • ✓ Does not alter floor levels
  • ✓ Great for renovations

Electric Systems Quote
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Water Systems

  • ✓ Ideal for larger zones over 25m²
  • ✓ Rapid auto heat loss calculations
  • ✓ Compatible with existing central heating systems
  • ✓ Great for new-builds

Water Systems Quote & Buy
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Projects Division Consultation

  • ✓ Bespoke heating solutions for new-build projects and larger renovations
  • ✓ Dedicated team to work with you
  • ✓ World-class expertise in R&D, building regulations and energy performance
  • ✓ Detailed system layouts for each stage of the project

Get In Touch with Warmup’s Projects Division
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For areas of 24m2 or more, use our full quoting system
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