Auxiliary heater for a vehicle and safety device for such a heater

The device has a fuel dispensing pump (6) and a controller (2) (microcontroller) that outputs control signals for the pump. A re-triggerable mono-flop (3) that receives periodic signals from the controller at one input outputs a continuous signal at the output as a result to a first input of an AND logic element (4) whose second input receives the control signal from the controller and whose output is connected to a pump control element (8). AN Independent claim is also included for the following: a safety device for a vehicle auxiliary heater.