What is MCS certification, and why does it matter?

If you are weighing up a heat pump, “MCS” is a term you will meet quickly, usually attached to the grant. This guide explains what MCS certification actually is, what it covers, and why it is worth insisting on.

What is MCS certification?

MCS stands for the Microgeneration Certification Scheme. Ofgem describes it as “a certification scheme for microgeneration installation companies and products” that “defines and maintains consistent standards for small-scale technologies that produce electricity and heat from renewable sources”. MCS itself puts it more simply: it is “the UK’s quality mark for small-scale renewables like heat pumps”. It covers heat pumps, solar panels and other home renewables.

For a heat pump, using an MCS certified installer matters for two reasons:

• The grant. The installation has to be MCS certified to qualify for the £7,500 Boiler Upgrade Scheme grant. Without it, you cannot get that money, however good a price looks (see our Boiler Upgrade Scheme guide).
• The standards. MCS sets how the system is designed and installed. MCS says certification “ensures that our installers install renewable technologies to the best possible quality, while also adhering to industry-recognised safety practices”, and that your system will be “designed and installed in accordance with MCS Standards”.

In other words, MCS is both a gateway to the grant and a quality benchmark for the work itself.

What MCS certifies: products and installations

People often say “MCS certified” as if it is one thing. It is really two, and both have to be in place.

Product certification

The heat pump model you are fitting must itself be MCS certified — tested, as MCS puts it, “for quality, reliability, and performance”. Certified models are listed on the MCS Product Directory, and Ofgem keeps a Product Eligibility List of products that meet the relevant MCS standards for the scheme. You do not have to search this yourself; your installer chooses from certified models.

Installer and installation certification

Separately, the company doing the work must hold MCS certification for the technology — heat pumps, in this case. Then each individual job is registered: when the installation is completed, an MCS certificate is created. MCS describes it as “a record that your heat pump installation has been done by a certified installer using certified products”. You should receive that certificate within 10 working days of completion, and it is logged on the MCS Installations Database (MID). Keep it safe — it is proof the job was done to the standard, and it is needed when you claim the grant.

So a fully compliant installation means a certified company fitting a certified product and registering the job. A certified company using an uncertified unit, or a certified unit fitted by an uncertified company, does not qualify.

The consumer protection behind MCS

MCS is not only about engineering. The contractor standard, MCS 001, ties certification to consumer protection in two ways that matter if something goes wrong.

First, an MCS certified contractor “shall be a member of” and comply with a code of practice — a Consumer Code — “approved by the Chartered Trading Standards Institute (CTSI)”. In practice that usually means the Renewable Energy Consumer Code (RECC), which says it is “approved by the Chartered Trading Standards Institute”, or HIES, whose installers “operate under a CTSI Approved Consumer Code”. These codes cover things like clear quotations, deposit protection and complaint handling.

Second, MCS 001 requires that “workmanship shall be guaranteed for at least 2 years following installation”, and that customers are “given an insurance policy which covers workmanship in the event the contractor ceases to trade”. So the quality of the installation is warranted for a minimum of two years, with an insurance-backed policy standing behind it if the installer goes out of business. That is separate from the manufacturer’s warranty on the heat pump itself, which our guide to how long heat pumps last explains.

On completion you should also get a handover pack — MCS says it includes key information such as product details and the workmanship warranty. Alongside regular servicing (see heat pump maintenance), that paperwork is what protects you later.

MCS and the Boiler Upgrade Scheme

This is where MCS matters most in dates and pounds. The Boiler Upgrade Scheme (BUS) gives £7,500 towards an air source or ground source heat pump in England and Wales, and it is tied to MCS at every step.

• The installer claims it, not you. Ofgem’s installer guidance says the scheme is “installer-led”: the installer applies to Ofgem on your behalf and you confirm your consent. “Installers must be MCS certified” to do this.
• The grant comes off your quote. Ofgem requires installers to “deduct the full BUS grant value from the quote before any payment is made”, shown on the quote and the invoice. You pay the balance, if any.
• An EPC is no longer a requirement. Since 28 April 2026, you can apply for the Boiler Upgrade Scheme without an EPC, though where a valid one exists its number is still provided.
• The heat pump must be MCS certified and the right size. Ofgem requires the heat pump to have “sufficient kilowatt thermal capacity to provide 100% of the space heating needs” of the property — it must meet the full space heating demand of your home, which is why a proper heat loss survey comes first (see what size heat pump you need).

For an air source heat pump the voucher, once issued, is valid for three months, so the job has to be finished and claimed in that window. Whether you may be eligible, and what the grant may cover, is covered in can you get a heat pump at no cost? and on our grants page.

What to check when choosing an installer

You do not have to take anyone’s word for their certification. Three checks cover most of it:

1. Confirm they are MCS certified for heat pumps. MCS runs a Find an Installer search on its website, so you can look the company up yourself rather than relying on a logo on a van or a website. Certification is specific to the technology, so check it covers heat pumps.
2. Expect a proper heat loss survey. A credible quote follows a room-by-room heat loss calculation, not a guess from the number of bedrooms. That is what sizes the heat pump and shows whether any radiators need changing — see do I need new radiators? and what to expect during installation.
3. Ask for the MCS certificate and handover pack on completion. You should receive the certificate within 10 working days and a handover pack with the workmanship warranty. If an installer cannot explain how you will get these, treat it as a warning sign.

It is also worth asking plainly how hot water will be provided and what the warranty terms are, so there are no surprises later.

Where ByEco stands

We will be straight with you: ByEco’s MCS and TrustMark certification is in progress. We are not yet MCS certified, which means that at the moment we cannot apply for the £7,500 Boiler Upgrade Scheme grant on your behalf — by law, only an MCS certified installer can. We can survey your home and design a system to MCS standards, explain exactly how the grant works and where our certification stands, and keep you informed as it progresses, so you can decide what suits your timing.

The cost of a heat pump depends on your property: the size of system it needs (set by the heat loss calculation), whether radiators or pipework need upgrading, where the outdoor unit goes and how far the pipe run is, how hot water will be provided, and any electrical work. Get in touch and we will arrange a free survey of your home and give you a clear, itemised quote; if you are happy with it, we can go ahead. You may be eligible for the £7,500 grant, which an MCS certified installer applies for. See our heat pumps page, our cost guide and the areas we cover across Greater Manchester.

Sources

Every figure on this page was checked against primary sources on 25 October 2026. Grant rules, planning rules and prices change — if you are reading this much later, verify before acting.

• MCS — Air source heat pumps: consumer guidance
• Ofgem — Boiler Upgrade Scheme: Guidance for Installers, Version 5.1
• Ofgem — Boiler Upgrade Scheme guidance for installers
• GOV.UK — Apply for the Boiler Upgrade Scheme: what you can get
• GOV.UK — Apply for the Boiler Upgrade Scheme: how to apply
• GOV.UK — Apply for the Boiler Upgrade Scheme: check if you’re eligible
• legislation.gov.uk — Boiler Upgrade Scheme (England and Wales) Regulations 2022, regulation 15
• MCS — MCS 001-1 The MCS Contractor Standard, Part 1, Issue 4.2
• Renewable Energy Consumer Code (RECC)
• Home Insulation & Energy Systems (HIES)