Since April 21, 2018 the Gas Appliance Regulation (GAR) replaces the Gas Appliance Directive (GAD). The GAR mainly ensures more uniformity and clarity for the manufacturers of gas appliances and gas appliance components. For example, the country-specific requirements set in the GAD have been replaced by a consistent set of rules for the entire EU.
You can read more about this here.
As a manufacturer or importer you have to show and declare compliance with the GAR by means of an EC type examination certificate and a demonstrably valid product(ion) surveillance contract, both as part of the technical construction file.
Based on your request, Kiwa sends you an offer specifying, among other things, the test program, sampling, inspection of your production process, and the certification schedule. Our offer takes account of the product test results you may already have acquired from other accredited test institutes. The result is a CE test report and a CE certificate. A CE surveillance agreement is the final step before you can enter the European market.
You can read more about testing and certification according to GAR right here.