The Solar Keymark Scheme Rules


In order to protect the added value of the Solar Keymark all misuse is prosecuted. In case of suspected misuse of the Solar Keymark:

  • Please inform the Keymark Manager Organisation if you find products on the market which are not certified and misuse the Solar Keymark (Internet, exhibitions, advertising, etc.).
  • In the case you identify certified products not being in conformity with the certificate, please inform the certification body which issued the certificate.
  • In all other cases where you have doubts about certified products or where you have good reasons to assume a misuse of the Solar Keymark, please inform the Solar Keymark Manager.


They will follow up on your contact, clarify the situation and, if required, contact the entity at stake with the aim of solving the problem directly. In case we are not able to solve the problem, the CEN Management Center will follow up on the process and take legal action if needed to.



 Why, as a manufacturer, the Solar Keymark is important?

The Solar Keymark:

  • is the only European quality mark for solar Thermal Products with an international recognition,
  • certification improve your internal process and quality assurance of your products,
  • facilitates the access to subsidy schemes in many countries (SKN Map of European Support Scheme),
  • Brings the support of the Solar Keymark Network, managing the Solar Keymark, as a technical partner, which can provide you with an assistance to better understand certified data,
  • Offers a competitive advantage to its owner!

How to certify a product?

All products falling under one of the following European standards can be Solar Keymark certified:

  • EN12975 Solar thermal collectors,
  • EN12976 Factory made systems,
  • EN12977 Custom built systems.

All documents related with the certification are available under “Scheme Rules” but we recommend to get in contact with any of your preferred certification body or testing laboratory to learn more about the procedures, advantages, obligations, delays and fees for the certification procedure.

Do you have any question regarding the Solar Keymark and the Solar Keymark Network?

Contact the Solar Keymark Secretariat at


Compositon of the SKN

The Solar Keymark was created to certify solar thermal products of high quality at European level. The aim is to reduce trade barriers and promote the use of high quality

The Solar Keymark Scheme Rules


The overall rules for the Solar Keymark certification scheme follows the general Keymark rules givene in the CEN docuemts below.

·        CEN/CENELEC Internal Regulations: Part 4 Certification, July 2018 (PDF)

The specific Solar Keymark rules acts as a supplement to the general rules, giving the specific requirements related to the particular Keymark certification of solar thermal products.

·        SOLAR KEYMARK SKN_N0444R5_SK_Scheme Rules (PDF) / Edition 2021-07-09

·        SKN_N0484_R6 History and List of changes for SK SRs SKN_N0444

·        Annexes:

Annex A              Inspection report templates

               A1          Factory inspection report

               A2          Physical inspection report

Annex E              FPC

Annex P              Product Specific Annex: Collectors EN 12975

               P1          General

               P2          Technical documentation

P3          Correction and interpretation file for the standard

P4.1       Datasheet Scenocalc

P4.2       Manual Aircow

P4.2       Datasheet AirCow

P5.1       PVT

P5.2       Coloured Glass

P5.3       Exchange rules for insulation

P5.4       Hydraulic Designation Code

P5.5       In-Situ Collector Certification

P5.6       Calculation Kd ISO 9806

P5.7       Thermodynamic Collector

Annex Q             Product Specific Annex: Systems EN 12976

               Q1          General

               Q2          Technical Documentation

Q3         Correction File

Q4         Datasheet

Annex R              Product Specific Annex: Systems EN 12977

               R1          General

               R2          Technical Documentation

R3          Correction File

R4.1      Datasheet Store

R4.2      Datasheet Controller

R5.1      Application of ST software for EN 12977-2 system simulations

Annex W            Weather Database

               W1         CEN Locations

               W2         EC Locations

               W3         Other Locations 


The former version of the Scheme Rules including the annex are still available at the Solar KEYMARK website in case the fall back clause will become into effect. This ensures that all third parties and customers can see the former version to make sure that in case of any overlooked error or inconsistency the previous version of the Scheme Rules and Annexes can be applied (i.e. the set of documents that is valid today).

Former version of the Scheme Rules including the annexes – Replaced by SKN_N0444R1 and its Annexes



Correction file for ISO 9806:2017 Normal 0 21 false false false DA X-NONE X-NONE


The Solar Keymark Network documents

See restricted area

Why choosing certified products?

The experts’ experience speaks about numerous unsuccessful solar thermal projects, where manufacturers invested extensive sums of money to produce products without the expected results.

Therefore, it is necessary to allocate a careful attention to all steps during the development of the project and its implementation. The choice of a reliable and effective collectors, as well as other important components of the system, is an important first step. The Solar Keymark aims at certifying the quality of your products as well as providing you with a key advantage on the market.

What is the Solar Keymark?

The Solar Keymark is a voluntary third-party certification mark for solar thermal products, owned by CEN/CENELEC.

Every certified product is in full conformity with the relevant European standards and fulfils additional requirements to assure constant quality. This level of quality is maintained by initial type testing and by regular controlled of the products and their production sites by independent inspectors. Consumers and authorities can fully rely on the certified products.

For these reasons the Solar Keymark is the basis for most European supporting schemes and it is also increasingly recognised or adapted worldwide.

The Solar Keymark can be currently granted to:

  • Solar collectors (according to EN 12975-1)
  • Factory made solar thermal systems (according to EN 12976-1)
  • Custom built solar systems thermal systems: solar water heaters and combisystems
  • (according to EN 12977-1)


How to recognise a certified Solar Keymark product?

Solar Keymark’s certified products bear the official Keymark logo together with an identification code.

solar keymark

Registered Code

Registering and comparing of certified products

In the Solar KEYMARK database, all certified products are listed with the links to the manufacturer's website and the data sheets of the product’s performance parameters.

The performance measurements and calculations utilise sophisticated mathematical apparatus and provide a model of solar collector’s or system’s behaviour in different conditions. This offers a very powerful tool for comparison of different products and (with respect to other facts like the prices, availability of the products, references about their manufacturers, etc.) gives you - or your designer, planner, architect, or developer - a good chance to choose the really best fitting solution for your specific needs, requirements, and conditions.

Solar Keymark Network

The Solar Keymark certification system is managed by a group of empowered certification bodies, recognised testing laboratories, quality-conscious manufacturers and Solar Heat Europe: The Solar Keymark Network.

Interested in joining the Solar Keymark Network?

Manufacturer can join the network for free under certain conditions. If you are interested to join our Solar Thermal experts network, please contact the Solar Keymark Manager or the Solar Keymark Chairman.



How does the Certification process work?

Certification Process


How does it apply for OEM products?

Consider the two following situations:

  • Situation I: A distributor buys Solar Keymarked collectors from the manufacturer and sells the collectors under the original name ->
    As the collector still has the original name and type referred to in the Solar Keymark license, the distributors can of course use the existing Solar Keymark.


  • Situation II: A distributor buys Solar Keymarked collectors from the manufacturer and sells the collectors under his own name ->
    As the collector has a new name and type, it is not possible to link it to the original Solar Keymark license. A new Solar Keymark license with the new name/type must be obtained. No testing is required to obtain the OEM Solar Keymark license, only paper work and inspection/visit.



For details please contact the relevant certification body.

How to deal with changes in the collectors?

To make certification more flexible and to save costs without losing confidence, the Solar Keymark scheme foresees the possibility to replace materials used in the collector by other materials accepted as equivalents.

Such a list of equivalents is already available for absorber coatings. Similar lists for glazing and insulation are being considered.

Should such a change be required, the Certification Body must be consulted in advance.

List of equivalent materials

Lists of equivalent absorber coatings (on aluminium and copper).

Solar Keymark products

Solar Keymark News