The test code applies to the tests of the thermal performance of oil-fired heating boilers (hereafter called 'boilers') and combined boilers and water heaters. The requirements are laid down in EN 303 : Part 1 and EN 303 : Part 2.
This Standard includes the requirements and recommendations for carrying out and evaluating the procedure for testing boilers and also the details of the technical conditions under which the tests shall be carried out.