Patent ID: 8822887

Claim:
A heater assembly used in connection with a diesel emissions fluid tank, the heater assembly comprising: a first heater including a lower surface; and a second heater including an upper surface; said first heater and said second heater being bonded together in a stacked relationship and attachable to the fluid tank, wherein the lower surface of said first heater contacts the upper surface of said second heater; wherein said first heater has a maximum power capability which is higher than a maximum power capability of said second heater, wherein said first heater is connected to an AC voltage circuit only and said second heater is connected to a DC voltage circuit only, wherein a control module thermostatically controls at least one of said first heater and said second heater in response to a diesel emission fluid temperature sensor reading; wherein said first heater is configured to thaw frozen diesel emissions fluid and said second heater is configured to prevent freezing of the diesel emissions fluid.