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+Kit for Smart Central Heating

The +Kit by Warmup provides an ideal solution for the new Boiler Plus legislation by upgrading the 4iE Smart WiFi Thermostat into a Smart Thermostat for central-heating.

Key Features


Wireless Receiver

Once connected to the existing boiler, allows wireless communication between the boiler and the thermostat.


Smart Heating

Bringing smarter, more advanced and ecological heating management to central-heating systems.



The +Kit’s technology offers a quick, efficient solution to Boiler Plus legislative concerns.


What is Boiler Plus?

On April 6th, 2018, the legislation around domestic boiler manufacturing and installation in the UK changed. The British Government’s Department for Business, Energy and Industrial Strategy (BEIS) introduced new regulations to improve the energy-efficiency and safety of boilers, leading to a cleaner, more ecological future for all of us.

All new boilers must now be installed with a programme timer and thermostat and the most common gas ‘Combi-Boiler’ must include one key energy-saving feature such as smart controls, weather compensation, load compensation or flue gas heat recovery.

The simplest way to comply with this regulation is to control boiler usage and home-heating with a Smart Thermostat, such as the ones designed by Warmup, that utilise advanced technologies to heat homes intuitively and effortlessly, thereby cutting down energy wastage. Warmup Smart Thermostat for Central Heating provides an easy solution to the new Boiler Plus legislation by offering automatic heating, energy monitoring functionality and cost-savings on your heating bills.

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Warmup’s +Kit for Boiler Plus Compliance

The +Kit has been designed to work with Warmup’s renowned 4iE Smart WiFi Thermostat to upgrade the thermostat from being a heating controller for underfloor heating systems to one that wirelessly controls central-heating systems, in line with Boiler Plus regulations. It offers all the benefits and features of the 4iE that customers the World over know and trust and brings these to centrally-heated homes.

Warmup’s +Kit brings mobile, wireless functionality to the 4iE – allowing control of the central-heating system from anywhere in the home. It comes with a Boiler Receiver, Power Adapter, Power Base and Stand that cradles the 4iE, allowing flexible placement of the thermostat in the home.

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Why Choose the Warmup 4iE +Kit Smart Thermostat?

The 4iE Smart WiFi Thermostat is Warmup’s smartest Smart thermostat that uses the latest technology to eliminate energy wastage completely and dramatically improves the efficiency of the heating system to comply with Boiler Plus legislation. The thermostat is easy to control and uses Natural Language Programming™ with a sleek and stylish, customisable design. The user can achieve significant cost-savings on their heating bills by using the thermostat alongside Warmup’s smartphone apps. The MyHeating app™ and its SmartGeo™ technology ensure your home is automatically heated up to your desired temperature only when you are at home or on your way home and that the heating runs at lower temperature when you are away, hugely cutting down on energy usage and running-costs too.

Learn more about the MyHeating app here >

PlusKit product

5iE smart thermostat on table

The 5iE Wireless Smart Thermostat or the +Kit?

  • Warmup’s +Kit has been developed with heating installers and engineers in mind. It offers a simple solution to Boiler Plus regulations and can quickly upgrade a new 4iE Smart WiFi Thermostat into a wireless central-heating controller.
  • Warmup’s 5iE Wireless Smart Thermostat is specifically designed for homeowners with central-heating. It comes as a pre-packaged combination of a Smart Thermostat and the +Kit’s individual parts, that are installed together to provide smart, automatic control of an existing boiler. The 5iE is also only available to purchase online, through the Warmup E-commerce Store whereas the +Kit and 4iE can be purchased from wholesalers and merchants across the country, offering flexibility depending on whether you are installing it for underfloor or central heating systems.

Technical Information

Installation Manual
Boiler plus Regulation
Get A Quote


Warmup offers a wide range of underfloor heating controllers from simple manual thermostats to the latest, remotely accessible Smart thermostats.

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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For areas of 24m2 or more, use our full quoting system
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