Heater for contaminant remediation

A heater comprising:

• an emissive rigid bar having an emissivity in the range of 0.01 to 0.6;
• a plurality of heater clips fixedly attached along the emissive rigid bar;
• each of the plurality of heater clips comprising one or more non-conductive guides affixed to the emissive rigid bar;
• a non-coiled, uninsulated, u-shaped resistive heating element with a first leg and a second leg, the first leg disposed through a first series of the one or more non-conductive guides, the second leg disposed through a second series of the one or more non-conductive guides, wherein the first leg and second leg are disposed parallel to one another and to the emissive rigid bar;
• the first leg configured to, either directly or indirectly, attach to a first electrical conductor of a power source;
• and
• the second leg configured to, either directly or indirectly, attach to a second electrical conductor of the power source,
• the first electrical conductor and second electrical conductor having a differing voltage potential between the first electrical conductor and second electrical conductor to thereby supply electrical current to the non-coiled, uninsulated, u-shaped resistive heating element;
• wherein the emissive rigid bar with the non-coiled, uninsulated, u-shaped resistive heating element is configured to be inserted into a casing of a heater well,
• wherein the emissivity of the emissive rigid bar is configured to be varied along a length of the emissive rigid bar.