Container heaters enable a 1000 litre tank (IBC type) to be kept frost-free and its temperature to be maintained. Container heaters comprise two 1000W independent heating zones, each having a 0/90°C thermostat. Class 2 double insulation design. Adjustable quick-release clips allow easy installation and removal by a single person. As an option, it is possible to provide a lid to insulate the top of the tank.