Manufacturer Installer Networks and Accredited Schemes

A manufacturer accredited installer scheme is a commercial programme run by a brand, not a public register. It sits on top of the statutory and industry schemes that actually govern who may legally work on a home's heating, hot water or renewable system. The distinction matters because the two are often described in the same breath by sales material, and only one of them is a condition of your warranty or of government funding.

The public layer is well defined. MCS is an independent certification scheme for microgeneration installation companies and products, and it is the route to government funding such as the Boiler Upgrade Scheme¹. Installers under UK Government schemes must be TrustMark registered or MCS certified³. Gas Safe registration is the separate legal requirement for gas work. A manufacturer's own network sits above these, offering training, genuine parts, technical support and sometimes a longer warranty term in exchange for loyalty and volume.

For a household, the practical effect is narrow but real. Accreditation can extend a warranty, speed up a parts claim and give access to a manufacturer's technical desk. It does not replace MCS certification, TrustMark registration or Gas Safe registration, and it does not by itself make an installation compliant. This page sets out how the programmes are structured, what accreditation actually requires, and how to verify a claim before signing anything.

What a manufacturer installer scheme is, and what it does for the householder

A manufacturer installer scheme is a membership arrangement between a brand and the firms that fit its products. The brand supplies training, technical literature, genuine parts and a route to extended warranty terms; the installer supplies volume, brand loyalty and a stream of registered installations that the manufacturer can track. The householder sits at the end of that chain and receives three things: a longer warranty in some cases, faster access to parts and technical support, and a named point of contact when something goes wrong.

What the scheme is not is a substitute for the statutory layer. MCS is an industry body which accredits installers and provides certification for products up to 50 kilowatts in capacity that generate renewable electricity¹. The scheme includes certification for products and installer companies, and for wind turbines and air source heat pumps under permitted development rights, equipment must be installed by an installer who has been certificated through the scheme using a certificated product². That is a planning condition, not a marketing preference.

The same pattern holds across technologies. For heat pumps, official guidance points to an installer who belongs to either the Microgeneration Certification Scheme or the relevant Competent Person Scheme⁹. For micro combined heat and power, it is advisable to contact an installer who can provide the necessary advice, preferably one who belongs to the relevant Competent Person Scheme¹⁰. For biomass metering under the Domestic RHI, metering equipment is only fitted by an installer certified to the Microgeneration Certification Scheme¹¹.

The independence question follows directly. A manufacturer scheme ties part of a household's aftercare to one company's commercial programme and to that company's continued health. The public schemes tie it to a certification body that outlives any single brand. Where a manufacturer fails or exits a market, the public certification and the building regulations certificate survive; the loyalty benefits do not. That is the balance to weigh when an extended warranty is offered as the reason to choose one installer over another.

Loyalty scheme or accreditation: the two kinds of installer programme

The programmes described as installer networks fall into two distinct types, and conflating them causes most of the confusion in this area.

Loyalty and rewards schemes are commercial. They reward installers for registering products, attending training and buying through approved merchants. The benefits flow mainly to the installer: rebates, priority technical support, marketing materials, sometimes preferential terms on parts. The householder may see a longer warranty as a consequence, but the scheme's purpose is to secure repeat business for the brand.

Accreditation schemes are closer to a quality mark. They set entry conditions, require training or certification, and may impose a code of conduct. They are still commercial, but the entry bar is the point of them, and the brand is staking its name on the installer's competence.

Both sit above a public layer that is not optional. Building control bodies may accept certification under independent schemes of certification and accreditation of installers as evidence of compliance with a relevant standard¹². That is the mechanism that makes a scheme membership meaningful to a regulator rather than just to a marketing department.

The two types also differ in what happens when they end. A loyalty scheme membership lapses quietly and the installer simply stops earning rebates. An accreditation can be withdrawn, and where it was the basis for an extended warranty term, that term may be affected. For government-funded work the position is firmer: installers must be registered with TrustMark and must remain registered until the installation work has been completed¹³.

Baxi Works: Baxi's loyalty scheme for installers of any size

Baxi Works is the manufacturer's installer-facing programme, and it illustrates the loyalty model well. Baxi supports a large installed base of residential and commercial heating products across the UK, which is the commercial reason the programme exists: a wide installed base needs a wide network of firms able to service it⁸.

The company's own aftercare messaging gives a sense of where installer time actually goes. Around 75% of installers' time is spent on maintenance and service work, according to reporting on Baxi's aftermarket strategy⁸. That figure explains the shape of a loyalty scheme built around genuine parts and technical support rather than around new installations alone. A programme that helps installers service existing appliances faster has more day-to-day value to a small firm than one that only rewards new boiler registrations.

On parts, Baxi genuine spare parts are tested and approved for use with Baxi appliances⁸. That is a warranty-relevant point rather than a marketing one: fitting a part that is not approved for the appliance is the kind of thing that can be raised when a claim is assessed. Baxi appointed Ethan Thompson as Head of Spares in July 2026, leading an operation covering supply chain, logistics, product portfolio management and genuine-parts sales⁸. The appointment signals continued investment in the parts side of the business.

For the householder, the practical question is what Baxi Works membership means at the point of installation. Registration of a new boiler is generally achieved by employing an installer who is registered under an approved scheme⁶. That is the building regulations route, and it is separate from the loyalty programme. A Baxi Works member will typically handle both, but the two are not the same thing, and the certificate that matters for compliance comes from the approved scheme route.

Baxi sits within BDR Thermea, which completed its full acquisition of Italian commercial HVAC manufacturer G.I. Holding in August 2026¹⁴. Parent group scale is relevant to a household only in one respect: it bears on the likelihood that parts and technical support continue to be available over the life of the appliance. For more on the group structure, see who owns which energy brand and the Baxi brand page.

myREWARDS: tiers for Gas Safe and MCS certified installers

Tiered rewards programmes are the commonest structure in the UK market. They typically require the installer to hold Gas Safe registration for gas work and MCS certification for renewable work, then reward volume and training completion with escalating benefits. The tier names vary by brand; the mechanics do not.

The public rules that sit underneath the tiers are consistent. Installers and the low-carbon heating products supported under the Boiler Upgrade Scheme must be Microgeneration Certification Scheme certified, and installers must be members of an approved consumer code⁴. MCS certification is a requirement of companies wanting to gain it: they must be members of a CTSI Approved Consumer Code of Practice scheme in the first instance¹⁵. That consumer code membership is what gives a household access to an independent complaints route, and it is a condition of the certification rather than an optional extra.

For gas work, the equivalent public layer is the Competent Person Scheme. An installer registered with a scheme can self-certify that their work complies with building standards⁵. A registered installer is approved to carry out the work to comply with building regulations without involving local authority building control¹⁶. For gas appliances specifically, employing a registered installer with the relevant competencies means they should be able to self-certify the work without the need for close involvement of building control¹⁷.

A tiered rewards programme therefore sits on top of two separate public credentials, one for gas and one for renewables. A firm that holds both can serve a household through a boiler replacement and a later heat pump or solar installation without the household changing contractor. A firm that holds only one will be limited to that side of the work, and the tier structure of any rewards programme will reflect it.

Fox ESS Accredited Installer Programme: three tiers of excellence

Storage and inverter brands run accreditation programmes on the same pattern, with tiers that reflect training, installation volume and technical competence. Fox ESS reported on 15 September 2026 that it had achieved the number one market share in Europe's residential energy storage¹⁸. A brand in that position has a large installed base to support, and an accredited installer network is the mechanism for doing it.

The tier structure in these programmes typically maps to the complexity of the work. Entry tiers cover standard residential battery and inverter installations. Higher tiers cover three-phase systems, larger arrays, commercial-scale work and, in some cases, the right to commission systems without prior technical sign-off from the manufacturer. The benefits at higher tiers usually include extended product warranty terms, priority technical support and access to firmware and configuration tools.

For a household, the relevant question is what the tier means for the installation in front of them. A higher-tier installer is more likely to have commissioned the specific model before, to have the manufacturer's technical desk on speed dial, and to be able to resolve a firmware or configuration issue without a site visit. Those are practical advantages at the point of fault, not at the point of sale.

The limits are the same as for any commercial programme. Accreditation is held by the company, not by the individual engineer who turns up. It can lapse. It does not replace MCS certification where that is required for funding, and it does not replace the electrical certification that governs the installation itself. For the wider picture on storage brands and their UK ranges, see home battery storage manufacturers and the Fox ESS brand page.

How accreditation is checked: training, codes of conduct and MCS certification

Accreditation is verified through a mixture of training records, audit and consumer code membership. The MCS scheme ensures that installers adhere to a strict code of conduct¹⁹. That code is the part with teeth, because it governs how a complaint is handled when the installation goes wrong.

The consumer code layer is a precondition rather than an add-on. A requirement of companies wanting to gain MCS certification is that they are members of a CTSI Approved Consumer Code of Practice scheme in the first instance¹⁵. The Renewable Energy Consumer Code is one such approved code, and membership brings obligations on quoting, contracting and after-sales handling¹⁵.

Audit runs at two levels. MCS undertakes its own checks on installations completed by MCS-certified installers, separate from Ofgem's audit programme, and may contact owners directly or arrange a visit²⁰. That means a household can be contacted after the work is done as part of a sample check, and the installation needs to stand up to that scrutiny. For Boiler Upgrade Scheme work, installers must be MCS certified to participate in the scheme⁴.

Manufacturer accreditation adds a third layer, usually lighter. It is checked through training completion, sometimes a practical assessment, and ongoing registration of installations. It is not a public register, so it cannot be verified the way MCS or Gas Safe can. That is the central limitation: a manufacturer's accreditation claim is only as good as the manufacturer's own record-keeping, and it is not independently audited in the way the public schemes are.

What an accredited installer means for warranty registration and household independence

The warranty effect of accreditation is real but narrower than sales material suggests. A manufacturer can offer a longer term to installations registered by an accredited installer, and it can make that term conditional on the installer's continued membership. What it cannot do is remove the statutory rights that attach to the installation itself, or the building regulations certificate issued at completion.

The registration mechanics are the part households most often miss. For a new boiler, registration is generally achieved by employing an installer who is registered under an approved scheme⁶. That is how the work is notified and certified. The manufacturer's warranty registration is a separate step, usually handled by the installer at the same time, and it is the step that determines whether an extended term applies.

On independence, the picture is mixed and worth stating plainly. A household that relies on a manufacturer's accredited network gains a single point of contact, faster parts and a longer warranty. It also takes on a dependency: the aftercare is tied to one company's commercial programme and to that company's continued presence in the UK market. The public layer, by contrast, is portable. MCS certification and TrustMark registration are held by the company and can be checked independently, and the building regulations certificate survives a change of manufacturer.

There is a further dependency in the funding schemes. For the Boiler Upgrade Scheme, additional account users must be direct employees of the registered MCS installer, and not sub-contractors⁷. That rule keeps the accountable party close to the work, but it also means a household cannot assume that the firm that quoted is the firm that will attend. Where a subcontractor is used, the certification and the accountability still rest with the registered installer.

For the wider context on how warranty terms are set and registered, see manufacturer warranties and registering a warranty and keeping it valid.

How to verify an installer's accreditation before you sign

Verification is a sequence, and it starts with the public registers rather than the manufacturer's marketing. Official guidance is to use the government-endorsed Microgeneration Certification Scheme to find certified installers, and to get at least three quotes from reputable installers¹⁹. For any work covered by a Competent Person Scheme, the advice is to check the installer is a member of a scheme covering the work they will be undertaking²¹.

The order that follows from the rules is:

1. Check the public credential first. For renewable work, confirm MCS certification. For gas work, confirm Gas Safe registration. For electrical work, confirm registration with a Competent Person Scheme, since a registered competent person can self-certify that the work meets the required standards²².
2. Check the consumer code. MCS certification requires membership of a CTSI Approved Consumer Code of Practice scheme¹⁵. Confirm which code and check the membership is current.
3. Check TrustMark where funding is involved. For government-funded work, the installer must be registered with TrustMark and must remain registered until the installation work has been completed¹³.
4. Check the manufacturer's accreditation separately. Ask for the scheme name, the membership tier and written confirmation from the manufacturer. This is the layer that cannot be checked on a public register.
5. Confirm who will actually attend. Under the Boiler Upgrade Scheme, additional account users must be direct employees of the registered MCS installer, not sub-contractors⁷.
6. Get the certificate at completion. A registered installer route means a certificate is issued on completion, and the work complies with building regulations without involving local authority building control²³.

For funded work, the vetting can go further than the household can check alone. Installers working on the Warm Homes Local Grant are subject to a rigorous vetting and onboarding process, including checks on qualifications, accreditations, insurance, health and safety standards and customer satisfaction²⁴. Under the Energy Company Obligation, installers have to be registered by a certification body to be eligible under the scheme²⁵. Where the installer is part of a competent person scheme such as MCS, NICEIC, CIGA or Stroma, they can self-certify their work and will not need to get building regulations approval separately²⁶.

The limits of verification are worth stating. A manufacturer's accreditation cannot be confirmed on a public register, so it rests on written confirmation from the brand. A scheme membership can lapse between the quote and the installation, which is why the TrustMark condition for funded work runs until completion¹³. And accreditation says nothing about price: there is no published comparison of accredited and non-accredited installer rates, and prices for this work are installer-quoted. What the rules do establish is that the non-accredited route carries a notification fee and a separate approval process⁶.

For the certification framework that sits behind these checks, see manufacturer certification and approvals and buying direct from a manufacturer or through an installer.