Water Heater connects with standard military connectors to auxiliary power supply of 24 volts DC in armored and soft-skinned vehicles. It has a low power uptake and only pulls 15 amps of power. With a built-in intelligent sensor, this unit automatically switches off if battery power is getting low and drops to 22 volts. There is a similar over-voltage protection feature in the event of a sudden power surge to over 39 volts. We deliver Water Heater in a promised time frame thanks to our efficient logistics system.