The Gas Boiler Act is the much-discussed certification of companies and the demonstration of skill of central heating mechanics. What goes well, what needs to be improved? Director Technique and Market of Techniek Nederland, Remco van der Linden looks back and ahead. "Many things must improve," referring to the establishment of umbrella certification, preconditions to boiler sales, and improvement of the administrative pressure for installation companies. "We have become a regulatory profession, equal to doctors and lawyers."