Heating Control and Thermostat Manufacturers

Heating controls are the least visible part of a home's heating system and one of the most consequential. The thermostat on the wall, the programmer by the tank and the valves on the radiators decide when heat is made, where it goes and at what temperature, and in a UK market where most controls now connect to the internet, who makes them matters as much as what they do. The makers fall into three broad groups: boiler and heat pump brands that supply controls matched to their own appliances, independent control specialists whose products work across systems, and energy suppliers selling smart controls under their own brand names.

The market behind those controls is changing quickly. Heat pumps are installed in only 1% of UK homes¹, but at least 33 manufacturers now supply air source heat pumps in the UK, with Mitsubishi Electric, Vaillant, Daikin and Samsung accounting for nearly two-thirds of annual sales², and every one of those appliances needs controls designed for low-temperature operation. At the same time, a UK law on connectable product security now governs how long a smart thermostat must keep receiving security updates³. This page profiles the makers, explains what their products do and sets out the rules that shape what a household can and should install.

UK brands behind thermostats and heating controls

The UK heating control market is not dominated by a single maker, because controls are sold through several channels at once. Appliance makers, such as boiler and heat pump manufacturers, supply controls matched to their own products; independent specialists sell thermostats, programmers and smart radiator valves that work across brands; and energy suppliers sell smart controls under their own names, with British Gas selling smart products from its Hive brand, including smart thermostats, smart plugs and smart light bulbs⁷.

British manufacturing has a real but partial presence. Trust Electric Heating describes itself as a British manufacturer delivering in the UK⁸, and Drayton states that its Wiser 2nd Generation radiator thermostat is manufactured in Britain at its Plymouth factory⁹. On the appliance side, the main companies manufacturing air source heat pumps in the UK in 2024 were Mitsubishi Electric, Vaillant, Ideal and Octopus Energy, with a total market share of 34%², while Kensa is the only UK manufacturer of ground source heat pump systems, holding 41% of that market². Industry analysis puts the UK-manufactured share of hydronic heat pump sales at 33.5%¹⁰, against 80% for UK-manufactured fossil fuel heating appliances¹⁰.

Trade bodies give a sense of scale. The Heat Pump Association's membership includes heat pump manufacturers providing over 85% of the heat pumps in the UK¹¹, described elsewhere as around 90% of the volume sold¹², and its membership covers manufacturers of heat pumps, components and associated equipment alongside energy companies, certification bodies, installers and training providers¹³. For context, 8.6% of UK homes are heated by electricity, whether from traditional storage heaters or modern heat pumps¹⁴, so the control market is still overwhelmingly shaped by gas boilers today, with the low-temperature segment growing around them.

Leading makers and their specialities

The appliance brands are the most visible control makers, because their controls ship with, and are often warranted around, their own boilers and heat pumps. Ideal Heating, for example, provides thermostats, timers and accessories for the full range of Ideal boilers and heat pumps¹⁵, and Worcester Bosch sells its EasyControl smart thermostat, listed at £170¹⁶. These own-brand controls are designed first for the maker's own appliances, and compatibility with other systems varies.

The independent specialists sell across all systems. Drayton's Wiser range includes smart radiator thermostats, with the 2nd Generation radiator thermostat available now in merchants nationwide⁹. Google sells its Nest Smart Thermostat E at £199¹⁶, and the Habi wireless smart thermostat is listed at £62¹⁶, which shows how wide the price spread is within the smart segment alone: independent guidance puts the typical smart thermostat at around £100 to £250⁴. On the emitter side, Stelrad describes itself as the UK's number one radiator brand¹⁷, and electric heating makers such as Trust Electric Heating offer a selection of thermostatic controls alongside their radiators, which are UK and internationally patented products⁸.

For a household, the practical difference between these groups is lock-in. An appliance brand's control is usually the safest compatibility choice for that brand's appliance, but it may not transfer if the boiler or heat pump is later replaced with another maker's product. An independent control is more portable between appliances, but the household then carries responsibility for checking compatibility itself. The wider manufacturer landscape is covered in our guide to home energy equipment manufacturers, and the appliance makers themselves in boiler manufacturers and heat pump manufacturers.

What the latest smart ranges can do

A smart thermostat does the same basic job as any other room thermostat: it senses temperature and switches the heating. What distinguishes the smart ranges is scheduling and access. Smart thermostats can be programmed, or remotely controlled, to manage a home's temperature, and most allow multiple routines to be set so the home reaches the desired temperature at different times of day¹⁸. That scheduling is where the running-cost benefit comes from, because heat is no longer produced to a single timetable for the whole house.

The smart segment now spans a wide price range, from the Habi wireless smart thermostat at £62 to the Google Nest Smart Thermostat E at £199 and the Worcester Bosch EasyControl at £170¹⁶, against a typical smart thermostat cost of around £100 to £250⁴. Smart radiator valves extend room-by-room control without rewiring, and Drayton's upgraded 2nd Generation smart radiator thermostat is manufactured in Britain and available nationwide⁹. Smart controls have also entered grant frameworks: the ECO4 measures table lists a smart thermostat measure, named Smarttherm¹⁹, which shows how far these products have moved from enthusiast gadgets into recognised efficiency measures.

Security is the part of the smart proposition that households most often overlook. Which? tests all smart thermostats in its testing programme for how well they protect against hacking attacks and how they handle data privacy, and raises concerns directly with manufacturers¹⁶. That testing exists because a smart thermostat is a connected device sitting on the home network with the authority to fire the boiler, and the legal framework for that is covered in the compliance section below. How long a maker keeps a smart control's app and firmware working is covered in our page on firmware updates and product support life.

Adjusting controls for heat pumps running at lower flow temperatures

A heat pump is controlled differently from a boiler, and the controls matter more to its efficiency. The heat a heat pump produces is generally at a lower temperature than a traditional heating system²⁰, so the control strategy cannot simply copy the on-off pattern a boiler uses. Heat pump systems are typically controlled by the end user via weather compensation or internal temperature control, such as a room thermostat, together with a timer or programmer²⁰. Weather compensation adjusts the flow temperature against outdoor conditions, which keeps the heat pump running in its most efficient mode rather than cycling hard on and off.

The division of labour inside the control system is worth understanding. Heat pumps are managed through a thermostat and controller, which may be built into the unit or separate; the controller adjusts the heating schedules, flow temperatures and hot water settings, while the thermostat signals when heating is needed²¹. Appliance makers supply these controls with the appliance, and Ideal Heating states that, just like a boiler, heat pumps can be controlled through accessories such as thermostats and timers¹⁵. Official guidance requires that the system has adequate controls, and that heat pumps and dedicated ancillary products such as integrated hot water storage vessels are commissioned in accordance with both the manufacturer's instructions and the appropriate system design parameters²².

Two practical points follow from the low-temperature design. Heat pumps have a heating boost setting that can give a little extra energy when the outdoor temperature is particularly low, using a little more electricity²³, and most current models work fine down to about -25°C, with some advanced cold-climate heat pumps working in temperatures as low as -35°C²³. Maintenance needs are modest: heat pump systems require very little maintenance but should still be checked periodically by an OFTEC registered heat pump installer²⁰. For the household, the dependence to note is that heat pump controls are usually tied to the appliance maker's own controller, so the control choice is effectively made when the heat pump is chosen.

PSTI statements explained: what compliance involves

Every smart thermostat, smart radiator valve and connected control sold in the UK now falls under the Product Security and Telecommunications Infrastructure regime. The core document is the statement of compliance, and its content is prescribed: all information required under PSTI must be included in the statement²⁴. The rules on format are specific. A physical copy of the statement provided with the product should suffice and could be included in the packaging or instructions, but a digital statement must accompany the product, and the use of a summary statement is currently not permitted²⁴.

Responsibility sits with the supply chain, not just the maker. The manufacturer, importer and distributor must ultimately ensure that the statement of compliance accompanies the product and meets the necessary legal requirements³. For a household buying a smart control, the practical implication is that the box, or the digital material supplied with it, should carry a full statement, and the statement should state the support period, the length of time the maker commits to providing security updates.

Independent testing sits alongside the legal requirement. Which? subjects all smart thermostats it tests to checks on protection from hacking attacks and data privacy, and raises any concerns with the manufacturers concerned¹⁶. A household cannot run those tests itself, but the statement of compliance and the test results together give a reasonable picture of whether a maker treats the connected part of its product seriously.

Choosing controls suited to your heating setup

The first rule of matching controls is that the control must suit the appliance, not just the home. Boiler-brand controls are engineered for their own appliances: Ideal Heating's thermostats, timers and accessories are provided for the full range of Ideal boilers and heat pumps¹⁵, and Worcester Bosch's EasyControl is designed around its own boilers¹⁶. Independent smart controls are designed to replace the room thermostat and programmer on a standard system, and the typical £100 to £250 device cost⁴ is before any installer charges for wiring changes.

The second rule is that the system's design temperature dictates the control strategy. A gas boiler system can tolerate crude on-off control because the boiler can produce high flow temperatures on demand; a heat pump cannot, because its heat is generally at a lower temperature than a traditional system²⁰ and its efficiency depends on the flow temperature being matched to conditions, which is what weather compensation does²⁰. This is why heat pump controls are normally supplied with the heat pump rather than chosen separately.

The third rule is national. Building regulations guidance differs between England and Wales, and Northern Ireland has its own review under way, so the control requirements that apply to a replacement boiler or a new heat pump depend on where the home is. The baseline across the guidance is the same in spirit: heat pumps are technically suitable for most UK homes if installed appropriately¹, and adequate controls are part of what makes the installation appropriate²². A household replacing an appliance should expect the installer to address controls as part of the job, not as an optional extra.

Installing controls in older buildings not built for them

Most UK homes were not designed around zoned, low-temperature heating, and retrofit is where control choices get constrained by the building. The evidence base for retrofit standards is substantial: the review behind the Welsh Part F and Part L changes drew on 75 case studies from the Retrofit for the Future programme, run by Innovate UK, and the AECB's Low Energy Buildings database²⁵. That evidence underpins the current regulatory assumption that existing homes can be brought up to modern control standards, room by room, rather than treated as lost causes.

The regulatory baseline for a retrofit is room-level control. Building regulations guidance states that each room should be provided with thermostatic room controls, in heating systems in new dwellings and when a heat generator such as a boiler is replaced in an existing dwelling⁶. In practice that means thermostatic radiator valves on the emitters and one or more room thermostats or sensing points, which in an older property usually means working with the existing pipe runs rather than against them.

For homes moving to a heat pump, retrofit has an extra layer. The heat pump itself needs to be commissioned in accordance with the manufacturer's instructions and the appropriate system design parameters²², and the controls are part of that commissioning, so a retrofit control plan drawn up for a boiler may need to be revised when the appliance changes. The dependence to note is on the installer: the household chooses the outcome, but the control design that satisfies both the maker's instructions and the building regulations is the installer's work, and its quality varies with the installer's competence.

Room-by-room control and how many zones a home need

The legal answer to how much control a home needs is more demanding than many households expect. Building regulations guidance states that each room should be provided with thermostatic room controls⁶, and the same requirement appears in the current Approved Document L for dwellings²². That is a room-by-room standard, not a whole-house one, and it applies in new dwellings and when a heat generator such as a boiler is replaced in an existing dwelling⁶.

How many zones a home needs beyond that baseline depends on the building. A small flat may need little more than the room-by-room valves and a single thermostat; a house with a converted loft or an extension used differently from the rest may benefit from separate zones with their own schedules. The temperature target is a household choice within a recognised band: energy saving guidance for UK households recommends setting the thermostat between 18°C and 21°C for comfort and efficiency⁵.

Two further points belong in any room-by-room plan. First, product standards apply to the controls themselves: there is a mandate for heating products sold on the GB market to display the UKCA mark²⁶, so a control sold legally in Great Britain carries that marking. Second, room-by-room control is where smart controls earn their price difference, because smart radiator valves give each room its own schedule without additional wiring⁹, which is often the only practical route to genuine zoning in a finished home. The trade-off is dependence on the maker's app and servers for the zoning to keep working, which is a real limit on the household's independence even as the control over heat becomes finer.

How stricter heating regulations affect your options

The control requirements on UK homes have already tightened, and they are set to tighten further. New thermostatic control measures were introduced in 2022 in all the GB regions, applying when a heating appliance, meaning a boiler, electric heating or a heat pump, is installed²⁷. That is why a replacement boiler now comes with thermostatic valves and zoning requirements attached: the rules changed at installation point, and the installer has to satisfy them.

The direction of travel is visible in the heat pump targets. The government's heat and buildings factsheet records an aim of 450,000 annual installations per year by 2030, with 70% targeted to be manufactured in the UK by 2035, and a record 125,000 heat pumps sold in 2025, a 27% increase over 2024, with approximately 45,000 manufactured in the UK²⁸. Against that, the UK currently manufactures around one third of the heat pumps sold here, with two thirds imported²⁶, so the appliance market, and the controls that ship with it, will remain a mix of domestic and imported products for years to come.

The barriers matter for households planning ahead. A lack of qualified heat pump installers is a further potential barrier to rollout, as are constraints imposed by planning rules and the need for electricity infrastructure upgrades¹. For control choices, the practical reading is that the rules will keep pushing toward room-by-room, low-temperature-capable control, and that a household buying controls today should expect them to work with a low-temperature system at some point in the appliance's life, because the regulatory direction is one way. Northern Ireland's building regulations review is still in discussion²⁷, so requirements there may continue to differ from GB.

Guarantees, sign-up and support contacts

Controls bought with an appliance are usually covered by the appliance maker's warranty, and registering the appliance generally registers the controls with it; the details of that process, and what can void it, are covered in our pages on manufacturer warranties and warranty registration. Independent smart controls are typically tied to the app account set up at installation, so the account details are effectively the registration. Keep the invoice, the installation date and the serial numbers, because a claim can turn on them.

For faults, the first contact is the maker's UK technical support, and fault codes are usually listed on the maker's support pages with their meaning and the action to take. Where the control came with a grant-funded installation, the complaint routes are separate and specific. Suspected fraud or misuse of the Boiler Upgrade Scheme is reported to Ofgem by emailing counterfraud@ofgem.gov.uk²⁹, administration complaints go to feedback@ofgem.gov.uk, and scheme policy complaints go to DESNZ on boilerupgradescheme@energysecurity.gov.uk³⁰. Heat network consumers contact Ofgem on HeatNetworksRegulation@ofgem.gov.uk³¹, an address confirmed in the final decision guidance³².

In Northern Ireland, the energy efficiency schemes have their own manager: the Help to Insulate and Thermal Comfort schemes are run by Energystore Ltd, contactable on 028 9030 1500 or 0800 028 3046, and by email at nisepenquiry@energystoreltd.com or info@energystoreltd.com³³. For the control itself, our page on manufacturer technical support and spare parts sets out how to approach a maker about a fault, and the page on manufacturer failures and orphaned products covers what happens when the maker of a connected control is no longer trading, which for app-dependent smart controls is the single largest risk to their long-term usefulness.