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Elnur Heater Controls and Programmers

Why is my heater warm at the wrong time? Can I set each room on its own schedule? What do the dials on a storage heater actually do?

Elnur and Gabarron controls cover room thermostats, timers, eco modes, app and voice control, and the input and output dials on storage heaters, plus how off-peak charging limits when heat is ready.

Sources last checked 7 October 2026

On this page
  1. How Controls Work
  2. Thermostat Settings
  3. Eco and Scheduling
  4. App and Voice Control
  5. Storage Heater Controls
  6. Charging Timing Limit
  7. Room by Room Heating
  8. Safety and Clearance
  9. Maintenance and Bleeding
  10. What You Can Control

Elnur is a Spanish manufacturer of electric heating whose products are widely sold in the UK, and its controls sit at the centre of what the brand offers. The Elnur G-Control Hub connects compatible Elnur heaters to a home's Wi-Fi, so that a phone app can set a daily and weekly schedule with chosen temperatures at chosen times, adjust temperatures remotely, and read an electricity meter1. The hub also manages surplus energy from photovoltaic installations, which is the feature that matters most for a household working towards energy independence: it can direct solar electricity the home has already generated into heating rather than exporting it1.

The rest of this page covers what those controls do in practice, how they behave on storage heaters as well as radiators, and where the limits are. Two limits matter more than any feature list. Storage heater controls of any brand work a day behind the weather, because the heater charges overnight for the following day2. And app control of any kind depends on broadband, the maker's servers and its app staying available1. Neither is a reason to avoid the controls, but both should be understood before a purchase.

How Elnur programmers and controls work

Elnur's control system has two halves: the hardware built into each heater, and the G-Control Hub that connects it to the outside world. Through the free Elnur Gabarron WiFi Control App, a household can set a daily and weekly schedule for its heaters, choosing set temperatures at selected times across the whole week1. The hub adds:

  • timer and programmer control through the app1
  • temperature control through the app1
  • an electricity meter function, so consumption is visible rather than guessed1
  • management of surplus photovoltaic generation1
Elnur Gabarron CTM20 WiFi programmable room thermostat shown front and back on a white background
Elnur Gabarron CTM20 WiFi programmable room thermostat shown front and back on a white background. Image: elnur.co.uk

The photovoltaic surplus management is the distinguishing feature. Where a home has solar panels, the hub manages surplus generation efficiently, using the home's own electricity to heat rather than letting it go to waste1. For a household with panels, this is the point at which electric heating stops being purely a drain on the grid and becomes a way of storing self-generated energy as warmth. For a household without panels, the hub is a scheduler and meter, useful but not transformative. The wider context for heating controls of all kinds is set out in heating controls, and electric-specific controls are covered in controls for electric radiators and panel heaters.

Thermostat settings: 18 to 21°C for comfort and efficiency

A small wall-mounted room thermostat on an internal wall of a simply furnished room, placed away from the window, radiator and door, with a simplified isometric figure nearby showing the room in ordinary use.
A room thermostat on an internal wall

Independent UK guidance converges on the same thermostat range. Cadent advises that a thermostat should be set between 18 and 21°C to keep you safe and well3, and the British Gas Energy Trust's energy saving tips give the same 18°C to 21°C range for comfort and efficiency4. A thermostat's job is to hold a room at the set temperature by switching the heater off when it is reached and on again when the room cools, so the setting is the single biggest lever on both comfort and running cost.

What the thermostat cannot do is make a badly controlled room behave. If furniture blocks a radiator, or unused rooms are heated to the same temperature as used ones, the thermostat holds the wrong rooms warm at the wrong times7. Guidance on what each room should be set to is in thermostat temperature settings, and the principles behind room thermostats are explained in room thermostats.

Eco settings, scheduling and open window shut off

Programming is where modern electric heating controls earn their keep. A weekly schedule means each heater comes on only in the hours the room is used, at the temperature the room needs, rather than running on a single wall switch. The Elnur app's scheduling allows set temperatures at selected times all week1, which is the same principle as any heating programmer: heat when needed, off when not.

Open window detection is a feature that appears on the wider market of smart heating controls rather than in Elnur's own published specification. The Aqara Smart Home Radiator Thermostat E1, for example, lists open window detection alongside GPS tracking, frost protection and on-valve controls8. The function senses the sudden temperature drop a window causes and pauses heating until the window is shut, so a ventilated room is not heated into the street. Householders comparing control ecosystems should check whether a specific feature is present on the exact model, since it is not universal. Scheduling principles, including setback temperatures, are covered in heating schedules and setback.

App and voice control: Google Home, Alexa and the Gabarron app

Elnur's app route is the Gabarron WiFi Control App, working through the G-Control Hub. The maker states that with the G Control System you can also control heating equipment with the voice assistants Alexa from Amazon or Google Home Assistant1. That puts Elnur in the same voice-control territory as the mainstream smart thermostats: independent guidance notes that smart thermostats connect to Amazon Alexa, Siri and Google Home, with Google Nest and Hive among the examples9, and that a smart thermostat's job is to learn your routine and adjust heating accordingly10.

A hand holds a smartphone displaying the Elnur Gabarron WiFi Control App weekly schedule screen, with a grid of seven day columns and plain colour temperature blocks at different times, beside a G-Control Hub on a table with a heater in the background.
The app sets a daily and weekly schedule with chosen temperatures at selected times. Image: Illustration

The dependence this creates is real and should be stated plainly. App scheduling, remote temperature changes and the electricity meter all run through the hub, the home's broadband, Elnur's servers and the Gabarron app1. If any link fails, the heaters still work on their local controls, but the smart layer goes with it. Which voice platforms work with which thermostats is compared in smart thermostats and Alexa or Google, and the cloud dependence question is examined in heating controls and energy independence.

Storage heater controls: input and output dials versus automated controls

An older storage heater standing against a room wall, shown with its top control panel carrying two round dials, one for input charge and one for output, drawn as plain knobs with simple setting marks and no readable text.
Storage heater with input and output dials

Storage heaters are controlled in one of two ways, depending on their age. Older storage heaters use input and output dials11. The input dial, sometimes known as charge, controls how much heat the heater stores as it charges overnight: higher input means hotter bricks and more heat for the next day5. The output dial controls how much heat the heater releases during the day, and the higher it is set, the quicker the stored heat is released5. Older heaters release heat continuously, with the output dial as the only throttle5. Some models add a boost setting6.

ControlOlder manual heatersModern high heat retention heaters
ChargingInput dial set by hand5Automatic charge control works out the charge needed11
Heat releaseOutput dial, continuous release5Thermostat and fan, released only below the set temperature5
ProgrammingNoneBuilt-in programmer11
App controlNot availablePossible depending on the model5

Modern storage heaters generally come with improved heating controls, including an automatic charge control, a thermostat and a programmer11. Once set, digital controls are easier to run than manual ones, because they automatically store enough heat for the set routine5. The building regulations treat this as a requirement, not a preference. The approved documents state that automatic control of input charge should be provided, together with an adjustable heat release rate, for electric storage heaters5. The full detail of storage heater controls is in storage heater controls.

Charging a day ahead: the timing limit

Every storage heater control, however sophisticated, shares one limit: the heater charges during off-peak hours when electricity is cheaper, usually overnight5, and it needs to charge the night before, so any change to the input will not take effect until the next day2. Storage heaters work by using cheaper off-peak night-time electricity to create and store heat for use the following day, which is why they are sometimes called Economy 7 heaters12. They work with special tariffs providing cheaper rates at certain times of day11, and the specification behind energy assessments recognises 7, 10 or 24 hour storage heaters13.

Automatic charge control softens but does not remove the limit. It regulates how much energy is used by storing more or less heat at night5, and on modern heaters it works out how much electricity it needs to store to meet the programme, using only the charge it needs11. That saves money on mild nights. It cannot add heat on a cold evening, because the charge for tonight was set last night. This is the structural weakness behind the common complaint that storage heaters run out of heat in the afternoon: their heat output usually declines in the evening, just when many homeowners need it most14, and they can leave a home very warm in the morning and struggling in the evening15. How controls interact with off-peak tariffs is covered in heating controls and time-of-use tariffs.

Heating each room separately

A cutaway two-storey house shown in isometric view with a separate electric panel heater in each of three rooms, each heater fitted with its own small control dial or programmer, one heater glowing warm in an occupied room while the heaters in two unoccupied rooms stay off.
Each room heated by its own controlled heater

Electric heating is naturally suited to zoning. Each room can be treated as a separate zone and controlled individually16, because each heater has its own thermostat and, with app control, its own schedule. Zone controls heat different rooms at different times of the day automatically, via separate programmable circuits for different parts of the house17. Official guidance under ECO4 defines time and temperature zone controls as enabling independent programming of temperature and heating times in at least two different areas of a premise18, and the same principle applies in underfloor heating, where zoning allows control of individual rooms with smart, programmable thermostats on a schedule19.

For a household, zoning is where the running-cost savings actually come from:

  • bedrooms heated only before sleep
  • living rooms heated only in the evening
  • spare rooms off entirely

The Elnur app's per-heater weekly schedule is built for exactly this1. How to divide a home into zones is covered in heating zoning.

Heater safety and required surrounding space

The safety picture divides by appliance type:

  • Fixed electric radiators with built-in safety features, thermostatic control and overheat protection can be left on overnight20.
  • Portable heaters are different: it is recommended not to use a portable heater overnight21.
  • Electric blankets can be dangerous if left on overnight unless they have a safe all-night setting, and should never be used with a hot water bottle22; if used overnight they should have temperature control settings and automatic shut-off23.

On the appliance side, Elnur's MAS15 electric system boiler, for example, carries a heating temperature limiter at 100°C, and its modulation requires an external thermostat connected to the heating circuit24. Around any heater, the everyday rules matter: do not dry clothes directly on an electric radiator, because covering the surface can trap heat, reduce efficiency and may cause overheating, and do not paint them, since added paint affects how heat is released and may damage the surface or safety features20.

Electric radiator maintenance and bleeding explained

No. Electric radiators do not circulate hot water and do not trap air, so they do not need bleeding25; as EDF puts it, there is no water inside them as there is in a traditional central heating radiator20. This is a genuine maintenance advantage over wet systems, where radiators need bleeding every couple of years to remove trapped air bubbles26, and should be checked at least once a year27, a job you can do yourself if an individual radiator is warmer in some places than others26.

What electric heating does demand instead is correct installation. Storage heaters are hard-wired to the correct circuit in the home, some larger models weigh more than 150kg, and a registered electrician should replace them11. There is no annual service in the boiler sense, but the electrical installation itself is the thing that must be right.

A hard-wired electric storage heater standing against a room wall, its supply cable rising to a wall-mounted connection point with a visible isolation switch beside it, drawn as a simple cutaway interior scene.
Storage heaters are hard-wired to a dedicated circuit and should be replaced by a registered electrician. Image: Illustration

What households can and cannot control

A storage heater standing against a living-room wall, connected by its flex and plug to a wall socket on the household mains supply, with a simplified isometric figure nearby indicating the connection.
A storage heater plugged into the mains supply

Elnur controls give a household real gains: per-room scheduling, visible electricity use, voice control through Alexa or Google Home, and the ability to put surplus solar generation into heat1. The thermostat range to aim for is 18 to 21°C3, and zoning room by room is where the savings are made16.

The dependencies are equally clear:

  • App and voice control need broadband, Elnur's servers and the Gabarron app to keep working1.
  • Storage heaters of any brand, Elnur included, charge a day ahead on an off-peak tariff, so a cold evening cannot be rescued by any control setting made that day2.
  • The building regulations expect automatic charge control on storage heaters5, which means older manual heaters fall short of current standards even when they still work.

For a household weighing the cloud dependence question specifically, smart heating control security and data sets out what app-based control means for privacy and long-term support.

Sources27 sources
  1. Elnur G-Control Hub for WiFi Control, Elnur, 2024-06-27
  2. How to save energy when you've got electric storage heaters, Home Energy Scotland, 2025-01
  3. Energy efficiency advice, Cadent Gas, 2026-09-20
  4. Best energy saving tips for UK households, British Gas Energy Trust, 2026-04-21
  5. Approved Document L Volume 1 consultation version, Welsh Government, 2025-08
  6. Approved Document L, Conservation of fuel and power, Volume 1: Dwellings, 2021 edition with 2023 amendments, UK Government, 2023
  7. Winter advice: stay safe, warm and connected, Cadent Gas, 2026-09-20
  8. Best smart radiator valves, Which?, 2026-09
  9. Best boilers guide, Confused.com, 2025-11-03
  10. What are smart thermostats?, Uswitch, 2026-02-05
  11. Electric storage heaters advice, Energy Saving Trust, 2026-05-20
  12. What is Economy 7, Smart Energy GB, 2026-04-07
  13. SAP 10.3 full specification, BRE Group, 2026-01-13
  14. What heating options are available off the grid?, OFTEC, 2026-09-20
  15. Electric heaters vs storage heaters, Energyhelpline, 2026-09-20
  16. Electric space heating, BEAMA, 2026-09-19
  17. Thermostats and heating controls advice, Energy Saving Trust, 2026-02-10
  18. ECO4 New Measures and Products Guidance v3.0, Ofgem, 2026-03-26
  19. Underfloor heating systems, NICEIC, 2026-09-17
  20. Electric radiators, EDF Energy, 2026
  21. Portable heaters safety advice, Electrical Safety First, 2026-09-17
  22. Stay warm this winter, Belfast City Council, 2026-09-20
  23. Electric blankets safety advice, Electrical Safety First, 2026-09-19
  24. MAS15 electric system boiler, Elnur, 2026-06-24
  25. How to bleed a radiator, Smart Energy GB, 2026-08-17
  26. Boiler maintenance guide, Uswitch, 2026-09-03
  27. How to keep your boiler working in cold weather, Which?, 2025-12-11

Questions

Some answers here, the rest on their own pages.

Can I leave an electric radiator on overnight with the thermostat on?

Yes, a fixed electric radiator with thermostatic control and overheat protection can be left on overnight, and its thermostat will hold the room at the set temperature. The exception is portable heaters, which should not be left running overnight. If you are using an electric blanket rather than a radiator, check that it has a dedicated all-night setting with automatic shut-off, and never combine it with a hot water bottle.

How do I set the input and output dials on an older storage heater?

The input dial, sometimes labelled charge, sets how much heat the heater stores overnight: higher input means hotter bricks and more heat available the next day. The output dial sets how quickly that stored heat is released during the day. Set the output to minimum when you go to bed so heat is not wasted overnight, and remember that any change to the input only takes effect from the following night's charge.

Why does my storage heater run out of heat in the afternoon?

Because it charged the night before, using electricity at the cheaper overnight rate, and its store of heat is finite. Older heaters release heat continuously, so the store drains through the day and output usually declines in the evening, exactly when most homes need warmth most. Raising the input dial today charges more heat for tomorrow, but nothing you do now adds heat for this evening. Modern heaters with thermostats and fans release heat only when the room falls below the set temperature.

Do electric radiators need bleeding or servicing?

No. Electric radiators contain no water, so they do not trap air and never need bleeding, unlike the radiators on a wet central heating system, which should be checked roughly once a year. There is no annual service in the way a gas boiler requires. What matters instead is keeping the heater's surface uncovered and clear of dust so heat can leave the appliance freely.

Can I dry clothes on or paint an electric radiator?

Neither is advisable. Covering the surface with clothes traps heat, reduces efficiency and may cause the radiator to overheat, and drying wet laundry on any radiator drives up running costs, potentially to as much as a tumble dryer, while creating condensation. Painting is also discouraged: extra paint affects how heat is released, reduces efficiency and may damage the surface or interfere with safety features.

How do I size a radiator for a room in watts or BTU?

Work out the room's BTU requirement first, then match it against the BTU rating printed for each radiator. The calculation depends on the room's size, how well it is insulated, how many outside walls it has and how glazing it contains. A radiator that is too small will run constantly without reaching temperature, while an oversized one costs more to buy than the room needs. Suppliers' sizing tools or an installer's survey give the figure.

Where should I position an electric radiator in a room?

Put the room thermostat where the temperature is relatively consistent, away from direct sunlight, draughts and heat sources. Keep furniture away from radiators so warm air can circulate, and turn radiators off in rooms you are not using. If a room contains the main thermostat, its heat emitter should have manual controls rather than thermostatic valves, because two temperature controls in one space fight each other.

Can storage heater controls be upgraded to automated controls?

Yes, but only by replacing the heater rather than fitting new dials. Older manual heaters cannot be converted; modern high heat retention storage heaters come with automated controls, including automatic charge control, a thermostat and a programmer, and some models can be controlled by an app. A registered electrician should carry out the replacement, since storage heaters are hard-wired to a dedicated circuit and some larger models weigh over 150kg.

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