Helo OK 33 PS - 3 (400V3N~) is traditional sauna heater control used with SKLE - sauna heaters, 9.0 -15.0 kW. Functions are temperature adjustment, preset time and heating time control (A+B scale gives the possibility to choose the preset and heating time either 8 hours + 4 hours or 12 hours heating time) and light switch. OK 33 PS - 3 is surface mounted outside the sauna room.