Coolant Storage Tank

A coolant storage tank () for storing coolant in a fuel cell system (), the coolant storage tank comprising a plurality of individually controllable heater elements (). A coolant storage tank comprising a first heater element () located at a base of the coolant storage tank and a second heater element () is also disclosed. A coolant storage tank comprising a first coolant storage compartment () in fluid communication with a second coolant storage compartment (), the first coolant storage compartment including at least a first heater element () and wherein the second coolant storage compartment is unheated is also disclosed. A method of melting frozen coolant in a coolant storage tank is also disclosed.