Double jacket must be operated without pressure; 2 electric heaters (6 kW) for heating up the heating medium in the double jacket; Attention: The tank is delivered without heating medium (glycerine or thermal oil), which must be filled in on site before commissioning ; control cabinet for the electric heaters available (temperature of the double jacket can be regulated via the control cabinet); 2 ball valves for the heating jacket are included in the scope of delivery; Contrary to what is stated in the drawing, the tank is not polished on the inside