Did more tests with different power meters. On initial bed heat, set to 100C, power draw (120V) was 270W. As the bed warmed up, the draw dropped, suggesting a PTC heater. By 50C it was down to 240W, 60C 236W, 70C 231W, 80C 225W, 90C 220W, 100C 215W. At temp, the power draw cycled between 210W, 130W and sometimes down to 8W.
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