High-quality 6 bar DHW safety groups made of stainless steel for protecting domestic hot water systems from excessive pressure rise, for pressure measurement, and for venting the system. Built with a stainless steel bar with the possibility of connecting a diaphragm expansion vessel. Equipped with a safety valve made of brass automatic vent made of brass and a pressure gauge. Safety groups are characterized by solid workmanship and permanent marking on the bodies, in accordance with European standards.