MCS certification matters most for heat pumps. In England and Wales, the Boiler Upgrade Scheme grant is only available through an MCS-certified installer, who applies for it on your behalf. For solar panels, what's at stake is different: there's no national solar or battery grant, but earning export payments under the Smart Export Guarantee needs an installation certified under MCS or an equivalent scheme such as Flexi-Orb. Knowing which of these applies to what you're buying is worth doing before you get quotes, not after.
What MCS actually is
MCS (Microgeneration Certification Scheme) is a UK quality assurance scheme covering both installers and products for small-scale renewable technologies — solar PV, battery storage, heat pumps, and others. It sets installation standards and verifies that the specific equipment used meets performance and safety benchmarks.
For a Boiler Upgrade Scheme grant, two things need to be true:
- The installer holds current MCS certification. They register with the scheme and apply for the grant for you.
- The heat pump meets the scheme's product standards. Ofgem publishes its own Product Eligibility List for the Boiler Upgrade Scheme. It's drawn from MCS's product directory but isn't identical to it, and Ofgem says it isn't exhaustive, so your installer confirms that the specific model qualifies.
What depends on it, technology by technology
- Heat pumps (Boiler Upgrade Scheme, England and Wales): £7,500 towards an air source or ground source heat pump, claimed by your MCS-certified installer. No MCS installer, no grant. There's also a £2,500 grant for air-to-air heat pumps, but with an eligibility catch that rules out many typical installs; see whether you'd actually qualify before counting on it.
- Solar panels: no national grant depends on MCS. What does is the Smart Export Guarantee, under which larger suppliers in Great Britain must pay you for electricity you export. To qualify, the installation must be certified under MCS or an equivalent scheme such as Flexi-Orb. Without that, you can still use your own solar power, but suppliers don't have to pay for what you export.
- Batteries: there's no national battery grant. If a battery will export to the grid, the export supplier decides what certification it needs, so check with them.
A lower quote from an uncertified installer can look cheaper upfront but cost you the £7,500 grant on a heat pump, or years of export payments on solar. Factor that into any quote comparison.
How to check before you commit
- Verify the installer on the MCS installer search (the scheme's official public database) — don't just take a company's word for it or trust a certificate photo
- For a heat pump grant, confirm the model is eligible: ask your installer to check it against Ofgem's Boiler Upgrade Scheme Product Eligibility List
- For solar, confirm how the installation will be certified (MCS or an equivalent such as Flexi-Orb), so you can register for export payments
- Get it in writing that the quote you've received is for certified work, before signing anything
What MCS doesn't guarantee
MCS certification is a baseline quality/eligibility standard, not a guarantee of the best price, the best design for your specific property, or the most reputable company to deal with. It's a necessary condition for the heat pump grant, not a complete vetting of an installer's overall quality — still worth getting multiple quotes and checking independent reviews alongside MCS status.
Checking grant eligibility for your own home? Our heat pump vs air conditioning guide covers the grants in detail.