MCS approved products: how to check the database before you specify a panel or inverter
- An MCS certificate requires the installation to use an MCS certified product - a product not listed in the directory invalidates both the certificate and the customer's grant eligibility.
- The Boiler Upgrade Scheme (up to £7,500) and Smart Export Guarantee both require MCS-certified products; a non-listed component removes access to these incentives.
- The MCS Product Directory at mcscertified.com/product-directory is searchable by technology type, certification status, and period - the check takes under two minutes.
- Grace period entries in the directory are time-limited; confirm the closing date before ordering a product carrying that status.
- Recording the certification number against each product in your quote creates an audit trail that supports both customer transparency and your annual MCS certification audit.
The MCS Product Directory lists every panel, inverter, and heat pump that carries active certification. Specifying a product that is not on the register invalidates your customer's grant eligibility and puts your own MCS certification at risk. This guide shows you how to search the directory and make the check a standard step in your quoting process.
The MCS approved products database - formally called the MCS Product Directory - is a publicly searchable register at mcscertified.com/product-directory that lists every panel, inverter, heat pump, battery, and other component that has been independently tested and certified to MCS Standards. An installer uses it by navigating to the directory, selecting the relevant technology type (solar PV, heat pump, battery storage, and so on), and entering the model number or manufacturer name to confirm whether a specific product is listed and whether its certification is currently active. The check takes under two minutes. Leaving it until handover can cost your customer their grant and put your own certification at risk.
Why a Non-Listed Product Invalidates Both the Grant and the Certificate
MCS sets three requirements for an installation to receive an MCS certificate: the work must be commissioned by an MCS certified installer, it must use an MCS certified product, and the commissioning date must fall after 15 July 2009. All three must be satisfied. Using an unlisted product fails the second requirement outright, regardless of how well the installation was designed and commissioned.
The consequences are immediate and concrete. For heat pump customers pursuing the Boiler Upgrade Scheme - which provides up to £7,500 toward the cost of a heat pump and draws on £1.5 billion of total funding committed through 2028 - product certification is a direct eligibility condition. The heat pump model must appear on the MCS Product Database, confirmed by MCS's own guidance. For solar PV customers, a non-MCS-certified installation cannot access the Smart Export Guarantee, meaning the customer cannot be paid for electricity they export to the grid. Where battery storage is installed alongside solar PV and the solar installation is not MCS-certified, the 0% VAT rate for the battery does not apply - the customer faces 20% VAT instead, adding a significant sum to the final bill.
For the installer, the risk is not limited to one job. MCS requires certified installers to use only MCS-listed products on every installation. Using a non-listed product is a compliance failure that can be flagged during an annual audit and result in suspension or removal of certification. That certification underpins the ability to offer grants on every future job.
Late discovery is expensive
If a product issue is found at or after commissioning, the options are limited. The customer cannot receive an MCS certificate based on a substitute product added at that stage - the certificate must reflect what was actually installed. Correcting the specification before you order is straightforward. Correcting it after the panels are on the roof is a different problem.
What the Product Directory Shows and What to Look For
The MCS Product Directory at mcscertified.com/product-directory is searchable by technology type, certification status, and certification period. Each entry shows the product model number, the certification number (issued by the test body), and the certification period - specifically the start and end dates.
Two types of entry require close attention. An active certification with a long end date is straightforward: the product is listed and can be used in MCS installations. A grace period entry - marked as such in the certification status - indicates that the original certification has expired but MCS has allowed a transitional window during which the product can still be used. Grace periods are time-limited and the product cannot be ordered for use in new MCS installations after the grace period closes.
Model numbers in the directory are exact. A panel listed as a specific model with a particular wattage and dimension must be matched precisely - a slight difference in the suffix, wattage designation, or dimensions identifies a different variant with its own certification status. Do not assume a brand family entry covers all models from that manufacturer. Check the specific model number your supplier has quoted.
Technology-specific standards
Products are certified against technology-specific MCS Standards - solar PV products against MCS 001, heat pumps against MCS 007, battery storage against MCS 030. Checking a panel in the solar PV section confirms MCS 001 compliance. An inverter may require a separate check under the relevant standard. For a typical residential solar package with battery storage, run checks for the panel, the inverter, and the battery separately.
Step-by-Step: Checking the MCS Product Directory
Gather the exact model numbers for every component you plan to specify
Before opening the directory, collect the full model numbers for each product in the planned installation: panel model, inverter model, battery model if applicable, and mounting system where relevant. Pull these from supplier data sheets or price lists rather than from memory. The directory search is model-number specific, and a partial or approximate model number will not return a reliable match.
Go to the MCS Product Directory at mcscertified.com/product-directory
Open the directory and select the technology type for the first product you are checking. Technology categories include solar PV panels, inverters, heat pumps, battery storage, and solar thermal. Use the search filters to narrow by technology before entering the model number.
Search for the product by model number and confirm the listing
Enter the model number in the search field. The directory returns matching entries. Confirm that the model number in the result matches yours exactly - including any suffix that denotes wattage, dimensions, or variant. If no result appears, the product is not currently listed.
Check the certification status and period
Review the certification period shown for the matching entry. Confirm whether the certification is active with a current or future end date, or whether the entry carries a grace period designation. If the end date has passed and there is no grace period extension, the product is no longer certifiable for use in new MCS installations.
Note the certification number for your records
Record the certification number shown in the directory entry. This is the reference issued by the product test body and is referenced in the MCS Installation Certificate issued at handover. Having it on file before you quote confirms the product status at the point of specification and provides a clear audit trail.
Repeat for every component in the installation
Run the same check for the inverter and battery storage unit separately. Each component carries its own certification status. An installation where the panel is listed but the inverter is not will still fail the MCS certificate requirement.
Flag unlisted products before the quote leaves your business
If a product does not appear in the directory, do not include it in the quote. Contact your supplier to identify an equivalent model that carries active MCS certification, run the replacement model through steps 1 to 6, and update the specification before the quote is issued. Sending a quote with a non-listed product and then substituting at order stage introduces a version mismatch between what the customer accepted and what was eventually installed.
Grace Periods, Equivalent Certifications, and Common Complications
Grace periods are issued by MCS when a certification expires but MCS wishes to allow a transitional window for products already in the supply chain. A grace period extension was issued in May 2026 for certain solar mounting products that lost certification. During a grace period, the product can still be used in MCS installations, but the window is finite. Confirm the closing date before committing to an order that will not be fulfilled and installed before that date.
MCS also recognises some non-UK certification schemes as equivalent for certain technologies - notably heat pumps and solar thermal. Some products certified under recognised European or international schemes may be eligible without a separate UK MCS certification. This equivalency list is published by MCS. Do not substitute a supplier's assurance of equivalency for a direct directory check or a review of the MCS equivalency list.
Product variants are a frequent source of errors. Manufacturers often certify specific configurations - particular wattages, cell counts, or physical dimensions - as distinct entries. Where a supplier describes a product as covering a wattage range, verify whether the directory shows a single entry covering that range or individual entries for each variant. Confirm the specific wattage being ordered is covered.
Check after supplier substitutions
Where a supplier substitutes a product at the time of order - even for an apparently equivalent alternative from the same manufacturer - run the replacement model through the directory check before accepting the substitution. A newer model from the same brand may have a different certification status.
Building the Check into Your Quoting Process
The directory check works as a compliance control only if it happens before the quote is issued, not at commissioning. For an installer managing multiple active jobs, a product specification decided on Monday morning may be ordered Wednesday and installed two weeks later. By the time a certification issue surfaces at handover, the customer has already accepted finance, applied for a grant voucher, and given notice to their existing heating contractor - all on the assumption that the system qualifies.
Making the check a documented step in your quoting process means it happens consistently regardless of who raises the quote. A quote that carries a record of the certification numbers confirmed at specification time gives both the customer and your own audit trail clear evidence that due diligence was done. When your MCS certification body conducts an annual audit and reviews your documentation, that record is part of what they examine.
Zigaflow's quotes feature supports this by allowing custom fields and line-item notes where certification numbers can be recorded alongside each product in the quote. Keeping the certification reference with the product line - rather than in a separate spreadsheet or note - means the information travels with the job from quote through to the MCS certificate issued at handover. Where you maintain a product list for recurring specifications, Zigaflow's inventory records can hold the MCS certification number and period against each product, making it straightforward to spot when a check needs to be refreshed.
For installers working across the renewables sector - residential solar, heat pumps, and battery storage - the database check is a two-minute task that protects both the customer's grant and your certification. The cost of skipping it is not a minor administrative correction at handover. It is a job that cannot be certified.
Sources
- Product Directory - MCSMCS (Microgeneration Certification Scheme) · accessed 2026-10-02
- MCS Certificate Queries - MCSMCS (Microgeneration Certification Scheme) · accessed 2026-10-02
- Product homepage - MCSMCS (Microgeneration Certification Scheme) · accessed 2026-10-02
- MCS Certification for Solar Installers UKElec-Mate · accessed 2026-10-02
- Installer grants and incentives - MCSMCS (Microgeneration Certification Scheme) · accessed 2026-10-02