Gastech-Energi A/S provides green heating systems for your home or business. Gastech-Energi A/S was established in 1992 speci ... alizing in environmentally responsible combustion technology and heating. We want to spread green energy and reduce the use of fossil fuels. Today we have 150 employees with headquarter in Risskov, Denmark. Therefore, Gastech-Energi A/S has the largest service organization for maintenance of gas boilers, hear pumps and gas furnaces. As of May 2015, Gastech-Energi became a part of Ariston Thermo Group. Ariston Thermo Group is a prominent, worldwide heating company from Italy. read more