Quality starts with the design. The right material, an extensively tested and easily reproducible construction lead to a high level of quality. Obviously, DEJONG is ISO9001 certified. The ISO 9001 certificate is issued by Det Norske Veritas (DNV). DEJONG guards the quality by measuring and checking every first product of a new production batch with electronic measuring equipment. Also every single hot water tank is submitted to a leakage test.

Regularly shipping audits take place to ensure DEJONG’s processes are well controlled. Quality is also influenced by the human factor. Therefore every employee of DEJONG follows an in-house training to acquire the specific skills. Comprehensive working instructions ensure that the quality demands of the product are well-known to all employees.