– switching on – parking heater mode 8 – heating mode 8 – heating at high altitudes 8 Control and safety devices 8 3 Technical data hydronic ii b 4 s petrol heater 9 hydronic ii b 5 s petrol heater 10 hydronic ii D 4 s diesel heater 11 hydronic ii D 5 s diesel heater 12 Water pump 13 – Water pump characteristic curve 13