A heater unit includes power failure management to detect disruptions in the electrical power supply, such as the AC supply, for the unit. The heater unit emits an audible alarm in response to detection of such a disruption, and may shut down the heater(s) and visuals display(s). The heater unit advantageously includes a power storage device, such as a super-capacitor, to temporarily power the electronic circuitry of the heater unit. Operating parameters, such as of a processor of the electronic circuitry, may be stored in a non-volatile memory response to the disruption, and recalled if the disruption terminates before the level of power has gotten too low to sustain reliable operation of the processor.