Apparatus, system, and method for reductant line heating control

A reductant heating system, comprising:

• a coolant line comprising a first portion positionable in heat exchanging communication with reductant in a reductant tank and a second portion positionable in heat exchanging communication with reductant in a reductant line, the reductant line configured to receive reductant from the reductant tank, wherein the second portion receives coolant exiting the reductant tank from the first portion;
• a flow regulation device coupled to the coolant line and configured to regulate the flow rate of coolant entering the first portion of the coolant line;
• and
• a controller communicable in signal transmitting communication with the flow regulation device to vary the flow rate of coolant through the first portion of the coolant line to achieve a desired temperature of coolant exiting the reductant tank in the second portion of the coolant line based on a temperature of coolant entering the reductant tank via the first portion and a temperature of reductant in the reductant tank.

A method for heating reductant in a reductant line coupled to a reductant tank, comprising:

• sensing a temperature of coolant entering a coolant line positioned in heat transfer communication with reductant in the reductant line and reductant tank;
• determining upper and lower temperature thresholds of reductant in the reductant line;
• and
• regulating a single flow regulating valve to adjust a flow rate of coolant through the coolant line based on the sensed temperature of coolant entering the coolant line, a desired temperature of coolant exiting the reductant tank, and a temperature of reductant in the reductant tank to maintain the temperature of reductant in the reductant line below the upper temperature threshold and above the lower temperature threshold.