Membership of the OpenTherm association is open to all companies and organizations which are active in the manufacture, distribution or installation of heating systems and components.

Membership benefits

Members of the OpenTherm Association have exclusive access to a test tool that was developed by the Association. The cost for this tool is € 3.500,- (ex. VAT). With this tool self certification has become the main method for obtaining a license.

And thereby be allowed to market the product concerned under the OpenTherm name and logo.

These rights are reserved to members only. This means that membership is compulsory for all manufacturers wishing to use the OpenTherm name and logo. In the case of system manufacturers (e.g. central heating appliance manufacturers) buying components containing the OpenTherm protocol from another supplier (e.g. an electronics manufacturer), one of the two manufacturers may accept responsibility for the correct implementation of the protocol (usually the electronics manufacturer). In the case of the electronics manufacturer being a member of the association, the rights to the use of the OpenTherm name and logo are automatically transferred to its OEM customer as long as the certified functions remain unaltered.

Companies who fulfil the association’s entry requirements but do not implement the protocol themselves, e.g. manufacturers of central heating appliances (OEMs), may also apply for membership. In this way they can keep up to date with the association’s activities and also exert influence upon them.

Costs of membership

The costs of membership are currently € 2.750,- (ex. VAT) per year. This includes license fees. In order to receive a license your product(s) must be tested with the Automated Test-Tool or by Kiwa Nederland B.V. / Gastec. Kiwa operates independently, which means that the costs of a test will be in addition to the membership costs.

After the payment is cleared, we will send you an email with your membership confirmation, containing your OpenTherm ID and an account for the OpenTherm members area.

Applying for membership

If you are interested in becoming a member, click here for the application form. The completed form will be send to the secretariat.