Every year, Installatörsföretagen publishes Teknikhandboken VVS, a handbook for plumbers who on approximately 600 pages shows professional execution of plumbing installations. The purpose of the manual and the app has been to make a book with useful information available in both digital and printed form intended for plumbing installers, fitters and consultants. The handbook mainly deals with heating and water and sewerage installations as well as the water-borne circuits in cooling installations